Addendum No. 4 07530 Coal Tar Elastomeric Roofing System 18014-Fleet07530 -1Coal-Tar Elastomeric Roofing SystemNelson + Morgan,Architects Service Bay ExpansionNMA 18014 Fleet Services Facility
SECTION 07530
COAL-TAR ELASTOMERIC ROOFING SYSTEM
PART 1 -GENERAL
1.01 DEFINITIONS
ACM Asbestos Containing MaterialsANSIAmerican National Standards Institute
ASCE American Society of Civil EngineersASTMAmerican Society for Testing and Materials
CTEM Coal-Tar Elastomeric MembraneEIPEthylene Interpolymer
EPA Environmental Protection AgencyEPDMEthylene Propylene Diene Monomer
EPS Expanded PolystyreneEVTEquiviscous Temperatures
FM Factory MutualIBCInternational Building Code
KEE Ketone Ethylene EsterNDLNo Dollar Limit
NESHAP National Emissions Standards for Hazardous Air PollutantsNRCANational Roofing Contractors Association
OSHA Occupational Safety & Health AdministrationSBSStyrene-Butadiene-Styrene
SDI Steel Deck InstituteSMACNASheet Metal and Air Conditioning Contractors National Association
SPRI Single Ply Roofing IndustryULUnderwriters Laboratories, Inc.
1.02 REFERENCES (INCLUDING LATEST REVISIONS)
A.Comply with governing local, state, and federal regulations, safety standards, and codes.
B.Testing Laboratory Services: Test results shall meet or exceed established standards.
C.Underwriters Laboratories, Inc. (Roofing Covering): Class A fire hazard classification.
D.American Society for Testing and Materials (ASTM)
E.The National Roofing Contractors Association (NRCA)-Roofing and Waterproofing Manual
F.Sheet Metal and Air Conditioning Contractors National Association (SMACNA)-
Architectural Sheet Metal Manual
G.American Society of Civil Engineers –ASCE 7
1.03 INSTALLER QUALIFICATIONS
A.Roofing installer must be:1.Currently prequalified with the Owner in accordance with Owner's prequalification
requirements.
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2.Currently in good standing with the manufacturer.3.Installer must be an experienced single firm specializing in the type of roofing repairand/or removal and replacement work required, employing only experienced workersfor the class of work in which they are employed, having at least five (5) yearssuccessful experience on projects similar in size and scope and acceptable asapplicators by the Project Manager/Architect.
4.Contractor must have successfully completed previous projects warranted by themanufacturer.
B.It shall remain each Bidder's responsibility to determine his current status with themanufacturer's certification plan.
1.04 MANUFACTURER QUALIFICATIONS
A.A qualified manufacturer is one that is UL listed and has FM approvals for a membraneroofing system similar to that used for this project for a minimum of fifteen (15) years.
1.05 CONTRACT DOCUMENT QUALITY ASSURANCE
A.In the case of an inconsistency between the drawings and specifications or within eitherdocument not clarified by addendum, the better quality or greater quantity of work shall beprovided in accordance with the Project Manager's/Architect's interpretation.
1.06 SUBMITTALS
A.Samples and Manufacturer's Submittals: Submit prior to delivery or installation.1.Samples of all roofing system components including all specified accessories.2.Samples of all materials used on the project,which are not supplied by themembrane manufacturer, shall be submitted to the membrane manufacturer forwritten approval prior to work starting.
3.Submit sample of proposed warranty complete with any addenda necessary to meetthe warranty requirements as specified.4.Submit latest edition of manufacturer's specifications and installation procedures.Submit only those items applicable to this project.5.A written statement from the roofing materials manufacturer approving the installer,specifications and drawings as described and/or shown for this project and stating
the intent to guarantee the completed project.6.Manufacturer's Equiviscous Temperatures (EVT) for the specified bitumens.
B.Shop Drawings: Provide manufacturer's approved details of all perimeter conditions,projection conditions, and any additional special job condition details other than indicated inthe drawings.
C.Maintenance Procedures: Within ten days of the date of Substantial Completion of theproject, deliver to the Owner two copies of the manufacturer's printed instructions regardingcare and maintenance of the roof.
1.07 DELIVERY, STORAGE, AND HANDLING
A.Deliver materials in manufacturer's original, unopened containers and rolls with all labelsintact and legible including labels indicating appropriate warnings, storage conditions, lotnumbers, and usage instructions. Materials damaged in shipping or storage shall not beused.
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B.Manufacturer's packaging and/or roll plastic is not acceptable for exterior storage.Tarpaulin with grommets shall be minimum acceptable for exterior coverings. All materialsstored as above shall be a minimum of four inches (4") off the substrate, and the tarpaulintied off with rope.
C.Deliver materials requiring fire resistance classification to the job with labels attached and
packaged as required by labeling service.
D.Deliver materials in sufficient quantity to allow continuity of work.
E.Handle and store material and equipment in such a manner as to avoid damage. Liquidproducts shall be delivered sealed, in original containers.
F.Handle rolled goods so as to prevent damage to edge or ends.
G.Select and operate material handling equipment so as not to damage existing constructionor applied roofing.
H.Moisture-sensitive products shall be maintained in dry storage areas and properly covered.Provide continuous protection of materials against wetting and moisture absorption. Storeroofing and flashing materials on clean raised platforms with weather protective coveringwhen stored outdoors.
I.Store rolled goods on end.
J.Protect materials against damage by construction traffic.
K.The proper storage of materials is the sole responsibility of the contractor and any wet ordamaged roofing materials shall be discarded, removed from the project site, and replacedprior to application.
L.Comply with fire and safety regulations, especially with materials which are extremelyflammable and/or toxic. Use safety precautions indicated on labels.
M.Products liable, such as emulsions, to degrade as a result of being frozen shall bemaintained above 40°F in heated storage.
N.No storage of materials shall be permitted on roof areas other than those materials that areto be installed the same day. Any exception must be in written form.
O.The contractor is to erect a temporary chain link fence, minimum six feet (6') in height,around work area stage and kettles. Fence is to be secured on a daily basis.
1.08 SITE CONDITIONS
A.Job Condition Requirements:1.Coordinate the work of the contractor with the work to be performed by other trades,to ensure proper sequencing of the entire work. The contractor is to schedule hiswork so that adequate time is allowed for other trades to perform their work.2.Apply roofing in dry weather.3.Do not apply roofing when ambient temperature is below 45°F.4.Proceed with roofing work only when weather conditions are in compliance withmanufacturer's recommended limitations, and when conditions will permit the work toproceed in accordance with specifications.
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5.Schedule the work so the building will be left watertight at the end of each day.Donot remove more roofing materials than can be reinstalled in any working day.6.Load placed on the roof at any point shall not exceed the safe load for which the roofis designed.7.All surfaces to receive new roofing shall be smooth, dry, and free from dirt, debris,and foreign material before any of this work is installed.Competent operators shall
be in attendance at all times equipment is in use. Materials shall be stored neatly inareas designated by the Project Manager/Architect.8.The contractor is to be aware of the potential for roof leaks on the existing roof as aresult of ruptured blisters and/or roof mat damage caused by the vacuum process,foot traffic, or material and equipment storage. The contractor is to take allnecessary precautions to prevent damage to the existing roof. All damage to the
existing roof that could result in roof leaks is to be repaired on a daily basis by theroofing contractor.9.The contractor shall follow local, state, and federal regulations, safety standards, andcodes for the removal, handling, and disposal of asbestos containing materials, ifpresent. When a conflict exists,follow the stricter document.10.Due caution should be exercised so as not to alter the structural integrity of the deck.
When cutting through any deck, care should be taken so as not to damage the deckor any part of the deck, such as post tension cables, etc.11.All kettles shall have a fume recovery system,automatic thermostat control,andvisibletemperature gauge all in working order.12.The contractor is to verify the location of all interior ducts, electrical lines, piping,conduit, and/or similar obstructions.The contractor is to perform all work in such a
manner as to avoid contact with the above mentioned items.13.Surface and air temperatures should be a minimum 40° F during applications ofcleaner and waterproof coating and remain above 40° F for a minimum of four (4)hours following applications.Verify compatibility of cleaner with coatings, paints,primers and joint sealers specified.Advise Project Manager/Architect of anyproblems in this regard prior to commencing cleaning operations.
14.Temporary Sanitary Facilities:a.The contractor shall furnish and maintain temporary sanitary facilities foremployees use during this project, including temporary toilets, wash facilities, anddrinking water fixtures.b.Toilet units shall be self-contained, single-occupant, of the chemical, aeratedrecirculation, or combustion type, properly vented and fully enclosed with a glass
fiber reinforced polyester shell or similar nonabsorbent material.c.Facilities shall be installed where they will best service the project's needs, withOwner's/Owner's Representative's approval.d.Contractor shall provide toilet tissue, paper towels, paper cups, and similardisposable materials for each facility. Provide covered waste containers for usedmaterial.e.All portable facilities shall comply with local laws, codes, and regulations.f.Contractor shall be responsible to see that the units are removed in a timelymanner after the completion of the project.
B.Protection of Work and Property:1.Work: The contractor shall maintain adequate protection of all his work from damageand shall protect the Owner's and adjacent property from injury or loss arising fromthis contract.Contractor shall provide and maintain at all times any OSHA requireddanger signs, guards, and/or obstructions necessary to protect the public and hisworkmen from any dangers inherent with or created by the work in progress.Allfederal, state, and city rules and requirements pertaining to safety and all EPAstandards, OSHA standards, NESHAP regulations pertaining to asbestos as requiredshall be fulfilled by the contractor as part of his proposal.
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2.Property: Protect existing planting and landscaping as necessary or required toprovide and maintain clearance and access to the work of this contract. Examples oftwo categories or degrees of protection are generally as follows: a)removal,protection, preservation, or replacement and replanting of plant materials;b)protection of plant materials in place, and replacement of any damage resultingfrom the contractor's operations.
3.Finished roof areas shall be protected from damage by the contractor duringconstruction.4.Twenty-four Hour Call: The contractor shall have personnel on call 24 hours per day,seven (7) days per week for emergencies during the course of a job.TheOwner/Project Manager/Architect is to have the 24 hour numbers for the contact.Contractor must be able to respond to any emergency call and have personnel
on-site within two (2)hours after contact.Numbers available to the Owner/ProjectManager/Architect are to be home, mobile,and office numbers for:a)Job Foremanb)Job Superintendentc)Owner or Company Officer
C.Damage to Work of Others: The contractor shall repair, refinish, and make good anydamage to the building or landscaping resulting from any of his operation.This shallinclude, but is not limited to, any damage to plaster, tile work, wall covering, paint, ceilings,floors, or any other finished work.Damage done to the building, equipment, or groundsmust be repaired at the successful contractor's expense holding the Owner harmless fromany other claims for property damage and/or personal injury.
D.Measurements: It will be the contractor's responsibility to obtain and/or verify anynecessary dimensions by visiting the job site, and the contractor shall be responsible forthe correctness of same.Any drawings supplied are for reference only.
E.Use of Premises:
1.The contractor is advised that the Owner will occupy the building at all times, and thecontractor must provide all safeguards required to protect personnel and to keepnoise levels as low as reasonably possible for each operation.2.The contractor shall:a)Coordinate work in such a manner as to not interfere with the normal operation ofthe building.
b)Assume full responsibility for protection and safekeeping of products stored onpremises.c)Agree to hold the Owner harmless in any and all liability of every nature anddescription which may be suffered through bodily injuries, including death of anypersons by reason of negligence of the contractor, agents, employees, orsubcontractors.
F.Cleaning and Disposal of Materials:1.Contractor shall keep the job clean and free from all loose materials and foreignmatter.Contractor shall take necessary precautions to keep outside walls clean andshall allow no roofing materials to remain on the outside walls.2.All waste materials, rubbish, etc., shall be removed from the Owner's premises asaccumulated.Rubbish shall be carefully handled to reduce the spread of dust.Asuitable scrap chute or hoist must be used to lower any debris.At completion, allwork areas shall be left broom clean and all contractor's equipment and materialsremoved from the site.3.All bituminous or roofing related materials shall be removed from ladders, stairs,railings, and similar parts of the building.4.Debris shall be deposited at an approved disposal site.
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1.09 SEQUENCING AND SCHEDULING
A.Coordinate roofing schedule with work of other trades.
B.Plan lay up of roofing membrane with respect to deck slope. Avoid situations where
excessive drainage could pass into completed roofing.
C.Maintain communication with roofing manufacturer's representative to inform of progressand to schedule periodic inspections.
D.All penetrations shall be made in roof prior to beginning with roof installation.
1.10 WARRANTIES
A.Roofing -Manufacturer: Project shall be installed in such a manner that the roofingmaterial manufacturer will furnish a written
twenty (20) year NDL type warranty with no exclusion for hail events containing hail stonesup to and including four inch (4")diameter
B.Roofing -Contractor: The contractor, jointly with any subcontractors employed by him,shall guarantee the work required and performed under this contract will be free fromdefects in workmanship and materials, and that the building will be and remain waterproof
for a two (2)year warranty period, after the Owner accepts the work as substantiallycomplete. The warranty shall be in approved notarized written form, to obligate thecontractor and his subcontractors, if any, to make good the requirements of the warranty.
C.Warranty repairs shall be performed by a certified installer. The repairs shall be performedin accordance with the manufacturer's written instructions and recommended procedures
so as to not void the warranty. Repair of the system, including materials and labor, shall bedone at no cost to the Owner.
D.During the proposal period each Bidder shall make arrangements with the materialmanufacturer to provide the required warranty. Refer to SUBMITTALS Paragraph in thissection for requirements concerning submittals of warranty.
E.Exterior Roof Access Ladder Warranty1.Ladder manufacturer has responsibility for an extended Corrective Period for work ofthis Section for a period of 5 years from date of Substantial Completion against all theconditions indicated below, and when notified in writing from Owner, laddermanufacturer shall promptly and without inconvenience and cost to Owner correctsaid deficiencies.a)Defects in materials and workmanship.b)Deterioration of material and surface performance below minimum OSHAstandards as certified by independent third party testing laboratory. Ordinarywear and tear, unusual abuse or neglect excepted.c)Within the warranty period, the ladder manufacturer shall, at its option, repair,replace, or refund the purchase price of defective ladder.
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2.Ladder manufacturer shall be notified immediately of defective products, and begiven a reasonable opportunity to inspect the goods prior to return. Laddermanufacturer will not assume responsibility, or compensation, for unauthorizedrepairs or labor. Ladder manufacturer makes no other warranty, expressed orimplied, to the merchantability, fitness for a particular purpose, design, sale,installation, or use, of the ladder; and shall not be liable for incidental or
consequential damages, losses of or expenses, resulting from the use of ladderproducts.
PART 2 -PRODUCTS
2.01 GENERAL
A.Compatibility: Provide materials that are recommended by manufacturers to be fullycompatible with indicated substrates, or provide separation materials as required to eliminatecontact between incompatible materials.
B.All materials shall be furnished,specified, or approved in writing by the manufacturerissuing the warranty.
C.All materials used on the project shall be asbestos free.
D.Liquid-type auxiliary materials shall meet VOC limits of authorities having jurisdiction.
2.02 FINISH MEMBRANE
A.The coal-tar elastomeric membrane (CTEM) shall be 60 mil overall calendered thickness.The membrane shall be a high-performance elastomeric membrane incorporating a
DuPontElvaloy® KEE (ketone ethylene ester), extended with coal-tar pitch andreinforced with polyester fibers as manufactured by Hyload, Inc., or approved equal.
B.The coal-tar elastomeric membrane (CTEM) shall meet the following physical properties:Elongation 170%, ASTM D 412; Tensile Strength 1500 lbs/in2, ASTM D 412; Tear Strength330 ppi, ASTM D 624; Density @ 70°F, 80 lbs/ft3; Low Temperature Flexibility, Pass,37-GP-56M; and Water Absorption less than 0.1%, 37-GP-56M.
2.03 BASE FLASHING -WHITE FLEECE-BACKED WELDED-SEAM
A.Membrane shall be nominal one hundred ten (110) mil in overall thickness consisting of awhite sixty (60) mil EIP thermoplastic membrane with fifty (50) mil thick backing of polyesterfleece with a minimum one and one-half inch (1-1/2") dry selvage edge for welding. Thewhite fleece-backed welded-seam membrane shall be a high-performance elastomericmembraneincorporating a DuPont Ethylene Interpolymer (EIP) alloy, reinforced with
polyester fibers as manufactured by Hyload, Inc., or pre-approved equal.
B.The white fleece-backed welded-seam membrane shall meet the following physicalproperties: Elongation 105%, ASTM D 412; Tensile Strength 1300 lbs/in2, ASTM D 412;Tear Strength 380 ppi, ASTM D 624; Density @ 70 F, 80 lbs/ft3; Low TemperatureFlexibility, Pass, 37-GP-56M; and Water Absorption less than 0.1%, 37-GP-56M. Roll size
shall be nominal forty inches wide by fifty feet long (40"x 50') having one and one-half inch(1-1/2") wide dry lap for hot-air welding on one or both sides of the membrane.
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2.04 BITUMEN
A.Shall be ASTM D 312 Type IV extra steep asphalt.
2.05 UNDERLAYMENT PLIES
A.Shall be Underwriters Laboratory approved.
B.Shall be nominal eighty-five (85) mil,smooth surfaced, SBS modified asphalt glassreinforced base sheet coated with flexible, SBS polymer-modified asphalt , meeting ASTMD6163, Type 1, Grade S.
2.06 CANT STRIP
A.Structural: Shall be wood where used for structural purposes meeting NRCA, FM Globaland Underwriters Laboratory guidelines.
B.Non-structural:Shall be wood fiber where used for non-structural purposes, conforming to
ASTM C208 and C209.
2.07 ROUGH LUMBER
A.All wood nailers,structural cants,curbs, and other miscellaneous rough carpentry,shall belumber as recommended by NRCA, and Underwriters Laboratory guidelines.
B.Vertical Wall Shimming Material: Shall be exterior grade plywood, gypsum core board, orconcrete core board unless otherwise accepted by Project Manager/Architect. Thicknessshall be as required for attachment or to make material flashing flush or level with offsetsand/or transitions, minimum three-fourths inch (3/4"). Proper selection of material isrequired to achieve UL guidelines.
2.08 SEALANTS
A.One-part Urethane Sealant: Sealant for use at coping joints, reglet joints, etc., shall be aone-component, high performance, non-priming,non-sag, gun grade elastomericpolyurethane sealant designed for use in active exterior joints, ASTM C 920, shall meet the
following physical and performance properties, SONOLASTIC® NP 1™ as manufacturedbyBASF Construction Chemicals, LLC, or approved equal.
Properties Results Test MethodsMovement capability,%±35 ASTM C719Tensile strength,psi (MPa)350 (2.4)ASTM D412Tear strength,pli 50 ASTM D1004Ultimate elongation at break,%800 ASTM D412Rheological,at 120° F (49° C)No sag ASTM C639(sag in vertical displacement)Extrudability,3 seconds Passes ASTM C603Hardness,Shore A ASTM C661At standard conditions 25 –30After heat aging (max Shore A: 50)25Weight loss,after heat aging 3%ASTM C792Cracking and chalking,after heat aging None ASTM C792Tack-free time,hrs, (maximum 72 hrs)Passes ASTM C679Stain and color change Passes (no visible stain)ASTM C510Bond durability,*on glass, aluminum,Passes ASTM C719
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and concrete ±35% movementAdhesion* in peel,pli (min. 5 pli)30 ASTM C794Adhesion* in peel after UV radiation Passes ASTM C794through glass (min. 5 pli)Artificial weathering,Xenon arc, 250 hours Passes ASTM C793Artificial weathering,Xenon arc, 3,000 hours No surface cracking
ASTM G26Water immersion,122° F (50° C)Passes 10 weeks with ASTM C1247movement cycling*Primed for water immersion dictated by ASTM C920.
B.Silyl-terminated Polyether Sealant:Sealant shall be a thermosetting, solvent free, non-
slump,self-fixturing, multipurpose structural sealant which shall meet the following physicaland performance properties, M-1 as manufactured by Chem Link, Inc., or approved equal.
PropertiesSpecific Gravity 1.62 (13.5 lbs./gallon)Viscosity 800,000+cps Brookfield RTV, TF spindle, 4 rpm
73°F.Shear Strength (ASTM D-1002)400 psi+ (7 day ambient cure)Elongation @ break (ASTM D-412)400-550% (7 day ambient cure)Hardness Shore A (ASTM C-661)45 ±3Tack free time (ASTM C-679)20 minutesLow temperature flex ASTM D-816)Minus 10°F pass 1/4" mandrel
Slump (sag) (ASTM C-697)Zero slumpShrinkage (ASTM D-2453)No measurable shrinkage (after 14 days)Service temperature -40°F to 200°F continuous service
2.09 FASTENERS
A.Fasteners and fastening plates or bars shall be as recommended by the fastenermanufacturer for the specific application.
B.Fastener for Steel Deck: Shall be a #14 fastener, fluorocarbon coated, with CR-10 coating.A minimum .200 diameter shank and .250 diameter thread. To be used with roundpressure plates or bar, and having a fluorocarbon CR-10 coating, when subjected to thirty
(30) Kesternich cycles (DIN 50018) shows less than 10% red rust which surpasses FMGlobal Approval Standard 4470, as manufactured by Olympic Manufacturing Group, Inc.,or approved equal. Fasteners, plates, and/or bars shall be listed in the FM Global ApprovalGuide.
2.10 ROOFING AGGREGATE
A.ASTM D 1863 covers the quality and grading of crushed stone and water worn gravelsuitable for use as coarse mineral aggregate.
B.General Characteristics of Crushed Stone and Gravel: The stone and gravel at the time ofapplication shall be hard, durable, surface dry (up to 2%) by weight moisture content), freeof clay, loam, sand, or other foreign substances, and shall conform to size grading andproperty requirements.
C.Grading: The aggregate shall conform to sieve analysis as follows:
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Sieve Total Passing3/4"1001/2"90 to 1003/8"40 to 70No. 4 0 to 15
No. 8 0 to 5
D.Physical Property Requirements:
Moisture, crushed stone and gravel 2.0% max.Unit Weight (loose)60 lbs./cu. ft., min.
Dust 0.5% max.Hardness, amount passing 20% max.No. 5 (3.36 mm) sieve whentested in accordance withASTM D 1865
ASTM D 1865
2.11 ASPHALT ROOF PRIMER
A.Quick-dry asphalt-based primer for priming of asphalt roof surfaces,as manufactured byapproved equal.
ASTM D 41Flash Point 105° FViscosity at 80° F (ASTM D 217)50-60 K.U.Weight per gallon 7.4 poundsDrying time (to touch)Min. 4 hours
2.12 ASPHALT PLASTIC ROOF CEMENT
A.Trowel-applied mastic used on flanges of gravel stops, stacks, vents, and similarapplications,as manufactured by Gardner-Gibson, Inc./ Johns-Manville, or approvedequal.
ASTM D 4586Flash Point 105° FWeight per gallon (approximate)11 lbs.Viscosity @ 80° F (ASTM D 217)270-330% Non-Volatile (Fed. Test Method 141)70% Min.% Specially Processed Bitumen 30% Min.% Total Solids, by Volume 75% Min.Dry film thickness of 1 gal./15 sq. ft.85 MilsDrying time 2 to 3 daysService Temperature, Extended Exposure -20° to +150° FResistance to Oils & Solvents PoorResistance to Sunlight GoodResistance to Chemicals GoodEffects of Weathering Slight chalkingWater ResistanceUnder Good Drainage Conditions ExcellentUnder Continuous Submersion Fair
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2.13 LEAD JACKS
A.Shall be four pound (4#) lead, and of dimensions required to completely cover existingplumbing stack.
2.14 PITCH PAN FILLER
A.Pitch pan sealant shall be one part, self-leveling coal-tar elastomeric urethane which shallmeet the following physical and performance properties, or approved equal.
Test Typical Value Test MethodElongation300%ASTM D 2370
Viscosity 15,000 –25,000 cps ASTM D 2196Flash Point 325°F minimum ASTM D 93
2.15 PIPE SUPPORTS
A.Pipe support system shall be a prefabricated, engineered support system designedspecifically for use on roofing without adhesive, roof penetrations, flashings, or damage toroofing system. Supports shall be as recommended by manufacturer as suitable for sizeand type of conduit or pipe being supported. Shall be as manufactured by AdvancedSupport Products, Inc., or approved equal.1.Base shall be seventeen inches (17") circular base, injected molded polypropylene,
with 227 square inches of surface on bottom, designed for weight disbursement;2.Dimensions shall be three inches (3") high by seventeen inches (17") in diameter, withmolded insert for square tubing and two threaded rod couplings molded in.3.Frame shall be pre-galvanized zinc coated 12 gauge channel meeting ASTM A653.4.Hangers shall be clevis and/or band type as per pipe requirements.5.Accessories shall consist of cadmium plated threaded rods, clamps, nuts, bolts, and
washers.6.Rollers shall be non-binding heavy duty SBR rubber.
2.16 ROOF WALKWAY MEMBRANE
A.The walkway pad shall have the following minimum physical properties, and be applied with
edges heat or solvent welded; size shall be 1/4"x 24"x 48", color shall be yellow,asmanufactured by The Biltrite Corporation, or approved equal.
Shore A Hardness (ASTM D2240)85 +/-5Elongation (ASTM D412)100% min.Tensile Strength (ASTM D412)500 psi min.Dimensional Stability (ASTM D1204)0.2%max. change
24 hours at 120FTear Resistance (ASTM D624)95 min
Tabor Abrasion, H-18 wheel/500 gr/1,000 rev.Weight Loss Grams 2.0 max.Gauge Loss Inches 0.025 max
Heat Aging (ASTM D573), 70 hours at 158F
Tensile 15%Elongation 15%
Shore A Hardness 10%
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2.17 ROOF PLAQUE
A.Contractor shall provide a sixteen inch by sixteen inch (16"x 16") metal plaque which shallcontain the information listed below. Fasteners to attach plaque shall be stainless steel,short enough to not penetrate outer surface of hatch or door where mounted. Location ofplaqueto be determined by Project Manager/Architect.
1.Project Manager/Architect name,phone number, contact person.2.School district phone number, contact person.3.School district emergency phone number.4.Contractor name, phone number, contact person.5.Subcontractor name, phone number, contact person.6.Roof Consultant, name, phone number, contact person.
7.Roof system, warranty information.8.Roof Manufacturer, phone number, contact person.
2.18 TERMINATION/PRESSURE BARS
A.Aluminum strip shall be extruded channel bar with a mill finish, width one inch (1"),
thickness 0.100"± .008", leg height one-fourth inch (1/4") top and bottom, leg angle ninetydegrees (90°), for perimeter and curb anchorage, having predrilled holes six inches (6") oncenter, as manufactured by Olympic Fasteners, or approved equal.
2.19 ELASTOMERIC SEALANT
A.Multi-Component Polysulfide Sealant:Except as otherwise indicated, providemanufacturer's standard, non-modified, 2-or-more-part, polyurethane-based, elastomericsealant; complying with either ASTM C 920, Type M, Class 25, or FS TT-S-00227E, ClassA; self-leveling grade/type where used in joints of surfaces subject to traffic, otherwisenon-sag grade/type,as manufactured by Sonneborn, or approved equal.
B.Durability: Less than 0.5 square inch adhesion/cohesion loss for three (3) samples of bothmortar and aluminum; ASTM C 719 test procedure.
C.Adhesion in Peel: Fifteen pound (15#) peel strength and 10% maximum loss of bond tosubstrate; ASTM C 794.
D.Bituminous Modification: Where joint surfaces contain or are contaminated with bituminousmaterials, provide manufacturer's modified type sealant which is compatible with jointsurfaces (modified with coal-tar or asphalt as required).
2.20 SELF-ADHERING UNDERLAYMENT FOR TEMPORARY WATERPROOFING
A.A premium heavyweight, minimum 60 mil, self-adhering underlayment, to use as atemporary waterproofing barrier.
2.21 DELIVERY AND STORAGE
A.All materials shall be delivered with appropriate carton and can labels indicatingappropriate warnings, storage conditions, lot numbers, and usage instructions. Materialsdamaged in shipping or storage shall not be used.
2.22 PRECAUTIONS
A.Some of the indicated materials are extremely flammable and/or toxic. Use precautionsindicated on can and carton labels.
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2.23 MISCELLANEOUS MATERIALS
A.Other materials shall be as specified,or of the best grade for the proposed use,asrecommended by the manufacturer of said product.
PART 3 -EXECUTION
3.01 REFERENCE
A.In the instance of a conflict between these specifications and those of the manufacturerand/or current NRCA, Underwriters Laboratory and IBC guidelines, the more stringent
specifications (better quality or greater quantity of work)shall take precedence.
B.The manufacturer's Technical Specifications and current NRCA, Underwriters Laboratoryand IBC guidelines shall be considered a part of this specification and shall be referred toforgeneralapplication procedures and recommendations.
C.Application of materials shall be in strict accordance with the manufacturer'srecommendations and current NRCA, Underwriters Laboratory and IBC guidelines, exceptwhere more stringent requirements (better quality or greater quantity of work)are shown orspecified.
D.General Installation:
1.Comply with governing local, state, and federal regulations, safety standards, andcodes.2.Protect adjacent areas with tarpaulin or other durable materials.3.Contractor shall prevent overspray, and be responsible for parking lot areas and/oradjoining areas not part of this contract.4.Contractor shall be responsible for sealing, as required, all openings that may allow
bitumen migration or drippage, i.e. pitch dams, envelopes, and filler strips.5.Prepare surfaces according to manufacturer's or applicator's published instructions.All metal that is to receive bitumen, or come in contact with bitumen or adhesive,shall be first primed with appropriate primer. Any prefinished galvanized sheet steelthat is to receive bitumen, or come in contact with bitumen or adhesive, shall bescored, scuffed or abraded before receiving primer application.
6.Use cleaning materials or primers necessary to render an acceptablesurface/substrate.7.All surfaces/substrates shall be clean and dry prior to application of materials.8.Prior to application of felts and membrane, all foreign matter, gravel, etc., shall beremoved from the insulation and/or substrate.Gravel or debris between theinsulation/substrate and plies is not acceptable.9.Prior to application of flashing membranes, substrate shall be clean and free of anypreviously installed roofing materials. Contractor shall ensure that all components ofsubstrate be structurally sound before application of flashing materials.10.Bitumen kettle shall have a fume recovery system, and visible thermometer toprovide positive monitoring of the bitumen temperature when it is heated inaccordance with manufacturer's instructions.11.Ambient temperature shall be 40° F and rising.12.The underlayment plies and field membrane are to be laid in the direction ofmaximum roof slope, working from bottom of slope toward ridge.
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13.All roof areas will be picture framed with the 60 mil coal-tar elastomeric membrane(CTEM) as the system is being applied. The outer edge of the picture frame sheetshall extend approximately two inches (2") above the top of the cant. All end laps ofthefield sheets of the 60 mil coal-tar elastomeric membrane shall lap the pictureframe sheet a minimum of eight inches (8") or the picture frame sheet side laps shalllap the field sheet a minimum of eight inches (8").
14.Wrinkles, buckles, kinks, and fishmouths are not acceptable when laying felt andmembrane.15.Dry voids of felt on felt or membrane on membrane are not acceptable.16.All surfaces that are to receive the self-adhered membranes shall be primed with afast drying asphaltic primer, except when self-adhered membrane is to be installedover a CTEM surface.
3.02 SUBSTRATE PREPARATION
A.New Construction: Substrate shall be smooth and free of debris, sharp edges, and othersurface irregularities prior to work starting. Substrate repair shall be performed as requiredto minimum of NRCA standards.
B.Metal Decks:1.All loose rust, bitumen, or other foreign material shall be removed from the deckbefore applying metal primer at the minimal rate of one and one-half (1-1/2) gallonsper one hundred (100) square feet of area.2.Deteriorated metal decking shall be repaired or replaced as required and as
recommended by the deck manufacturer on a unit cost basis as approved by ProjectManager/Architect.3.The metal deck shall be of like kind, quality, gauge and configuration. The deck spanshall not exceed that recommended by FM Global Bulletin 1-28.4.If metal deck must be replaced:a)Erect metal decking as recommended by the SDI. Properly align and level on
structural supports.b)Allow minimum three inch (3") bearing when supported by structural steel andminimum six inch (6") bearing when supported by masonry.c)Care shall be exercised in the selection of electrodes and amperage to providepositive welds and to prevent blowholes.d)Weld metal shall penetrate all layers of deck material at end laps and side joints
and shall have good fusion to the supporting members.e)Side lap fasteners shall be No. 12, self-drilling, self-tapping screws.f)Install closure strips and angle flashings as required to close openings betweendeck and walls, columns and openings.g)Immediately after installation, touchup welds, burned areas and damaged spotswith prime paint.5.Expansion/control joints shall be installed so that no one area exceeds two hundredfeet by two hundred feet (200' x 200').
3.03 CATEGORY II (NON-FRIABLE) ASBESTOS CONTAINING MATERIALS (ACM) REMOVAL
A.Owner and Contractor agree to exonerate, indemnify, defend, and hold harmless theroofing material manufacturer from and against all claims, demands, lawsuits, damages,expenses and losses incurred by Contractor's removal of asbestos-containing materialsfrom Owner's building and work site. Contractor must conduct its operations according toapplicable requirements including but not limited to those established by:1.Occupation Safety and Health Administration (OSHA).2.Environmental Protection Agency (EPA).3.Department of Transportation (DOT).
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4.State or Local Air Pollution Control Authorities/Agencies.5.State or Local Solid Waste or Hazardous Waste Authorities/Agencies.6.State or Local Health Department(s).7.State or Local Building Code Authorities.8.Other federal, state or local agencies or authorities.
B.Contractor or Owner shall perform appropriate inspections, surveys and file timelynotifications to proper authorities prior to starting roof renovation or demolition activities.Inspectors, project planners, project managers, contractors and workers involved in the roofproject shall have appropriate training, licenses and registrations. Contractor and Ownershall be responsible for determining and implementing regulatory compliance activities,including but not limited to work practices, engineering controls, personal protection, air
monitoring, testing, hazard communication, material handling, record retention, andarranging for waste disposal/handling.
C.Contractor must file a Uniform Hazardous Waste Manifest from proper landfill site for eachload of asbestos containing material removed. Copies must be sent to Owner and materialmanufacturer/specifier. Transportation of waste shall be in accordance with applicable
Department of Transportation (DOT) requirements.
3.04 ASPHALT HEATING
A.Use low burner flames during initial melt-downs. Circulate asphalt after initial melt-down.1.Maximum asphalt temperature shall be 25°F below the flash point.
B.Avoid prolonged heating of asphalt at high temperatures. Reduce the asphalt temperatureto below 500°F if asphalt is not being used for periods of four (4) hours or more.
C.Kettle shall be free of contaminants.
D.Application rates: Bitumen quantities for waterstop/tie-offs, flashings, miscellaneous detailapplications, and minimum kettle capacity are not included in application rates. To accountfor these factors, add approximately 25 percent additional bitumen on a total job averagebasis.
3.05 ROUGH CARPENTRY
A.Nailers shall be installed according to NRCA, Underwriters Laboratory, and IBC guidelines.
B.Wooden nailers shall be installed at gravel stops, drip edges, expansion joints, and onoutside perimeter of building.
C.Gravel stop and drip edge nailers shall be the same height as the new insulation beinginstalled where required.
D.Nailers shall be raised if necessary by anchoring an additional nailer of appropriate heightto the existing nailer if the existing nailer is not to be replaced.
E.Expansion joint nailers shall extend upward a minimum of eight inches (8") above finishroof height.
F.Where parapet wall exists,specified vertical wall shimming material shall be installedbeginning at roof height up to a minimum of twelve inches (12”) above finished roofsurface, or as detailed,to provide substrate for horizontal termination of roof to wall flashingsystem.
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G.Any lumber or shimming required for attachment,or to make material flashing flush or levelwith offsets and/or transitions,shall be incorporated in these specifications.
3.06 CANTS
A.Provide full 45 degree cant strips (no partials) at all intersections of vertical and horizontalsurfaces, such as walls,parapet walls, curbs, expansion joints, etc., and as recommendedby membrane manufacturer.
B.Cants shall provide a four (4) inch rise above the roof’s surface.
C.Toe of cant shall be level with the surface to receive new roof membrane and in all casesanchored according to NRCA, Underwriters Laboratory, and IBC guidelines.
D.Cant strips shall be installed at the intersection of the deck and all vertical surfaces.
E.If a wood cant is used where insulation exists, cant shall be toe nailed into treated woodnailerunder cant the same height as insulation.
3.07 MECHANICALLY FASTENED INSULATION
A.Specified insulation shall be mechanically fastened to conform to the ASCE 7 criteria for
wind uplift as dictated by wind zone applicable to location of project. Fasteners andfastening patterns shall be determined by building height, location and geographical area ofthe United States. It is the contractor's responsibility to consult current publications,literature, and bulletins of IBC and the manufacturer that are in effect at the time of thisproject. Boards shall be staggered and butted as close as possible with voids overone-fourth inch (1/4") to be filled.
B.Insulation shall be installed to conform to the ASCE 7 criteria, and shall be laid with edgesparallel to flutes and bearing on deck surface/flats. The long dimension of base insulationlayer must be fully supported by the top flange of the metal deck. The edges of insulationboards must not cantilever over the flutes of the metal deck.
3.08 APPLICATION OF UNDERLAYMENT PLY SHEETS
A.Insulation shall be covered with one (1) layer of specified fiberglass ply sheet fully adhered.
B.All layers shall be solid mopped in a uniform and continuous manner at the nominal rate ofthirty pounds (30#) ±20% per one hundred (100) square feet using steep asphalt Type IV
as required by slope, properly heated and applied within the Equiviscous Temperature(EVT) range.
C.Apply adhesive no more than ten (10) feet ahead of each roll being embedded.
D.Broom each ply from the unmopped side before adhesive cools. Ensure complete andcontinuous seal and contact between bitumen and ply sheets without wrinkles, includingends, edges, laps, fishmouths, or blisters. Broom width shall be thirty-four inches (34")minimum. Avoid walking on plies until adhesive has set.
E.Specified layers shall be applied in accordance with the manufacturer's recommendationsand in accordance with general practices as set forth by the NRCA Roofing Manual.
F.Use starter sheets at all edges as required. Two-ply underlayment requires a nineteeninch(19") starter sheet.
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G.If slope dictates, underlayment plies shall be installed using the strapped method going withthe slope as required by membrane manufacturer.
3.09 APPLICATION OF FINISH FIELD PLY
A.Unroll at least ten feet (10') of the 60 mil coal-tar elastomeric membrane (CTEM) andposition the sheet. The properly heated steep asphalt (per specification) should be appliedat the rate of approximately thirty pounds (30#) ± 20% per one hundred (100) square feetwith a mop just ahead of the roll of the CTEM to form a pool of asphalt into which themembrane is to be rolled. The roll of CTEM should push a puddle of asphalt ahead of itwith no voids. Care should also be taken not to trap air under the membrane. The pool of
asphalt in front of the roll will eliminate entrapped air.
B.The asphalt must be mopped so as to extend beyond both edges of the sheet. The amountof asphalt should be just sufficient for excess asphalt to squeeze out along the edges.
C.If slope dictates, membrane shall be installed using the strapped method going with the
slope as required by membrane manufacturer.
D.Picture frame all roof areas with 60 mil coal-tar elastomeric membrane (CTEM) as finishmembrane ply is being applied. Rectangular type projections should also be pictureframed.
3.10 FIELD LAP SPLICE
A.Coal-tar elastomeric membrane (CTEM) shall be installed as above with side lap minimumthree inches (3"), no maximum.End laps shall be minimum eight inches (8"), no maximum,and staggered a minimum of four feet (4'), no maximum.
B.Field Lap Splice with Bitumen: The membrane shall be laid in the same direction as thebaseply, but the laps shall not coincide with the base ply. While asphalt is still hot,pressure shall be applied to the laps with a trowel or similar tool to ensure complete contactwith the asphalt, and a squeeze-out of bitumen shall be visible. The side laps in the 60 milcoal-tar elastomeric membrane (CTEM) should not be located above those in the base ply,but located to one side or other to avoid excessive ply build-up. Lack of or no side lap
bitumen squeeze-out is not acceptable. Contractor shall cut away dry material to drymaterial, and install a minimum of twelve inch (12") wide membrane overlaid in hotbitumen.
C.Field Seams/Laps:1.All laps/seams, cross seams, T-joints, seams/openings at penetrations, or otherdetails shall be sealed and checked daily, no variance.2.Laps:All laps shall be straight and free of wrinkles and/or fishmouths, no variance.
3.11 BACKNAILING/STRAPPING
A.On slopes greater than one inch (1") in twelve inches (12"), refer to NRCA and/ormanufacturer's guidelines for backnailing procedures and follow the more stringentguidelines for all specified materials.
Slope Interply& Top Pour Backnail Strap0-½" per 12"Type IV No No½"-2" per 12"Type IV Yes Strap if possible2"-3" per 12"Type IV Yes Yes
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3.12 PERIMETER FASTENING
A.Wood nailers are required for perimeter gravel stops or drip edges. Field membrane andall plies shall be mechanically fastened on the vertical face of nailer,twelve inches (12")oncentermaximum.
3.13 FLASHING -GENERAL
A.Flash all penetrations, metal edge systems, walls, curbs, expansion joints, drains as shownon details and approved shop drawings with white Elvaloy®flashing membrane.1.Field fabricate flashings for vent pipes, vent stacks, or other multi-angled roofprojections/penetrations.
2.Mechanically fasten flashing at terminations according to approved details.3.Fastening membrane flashing through metal counterflashing without the use of atermination bar is not acceptable.
B.Any lumber or shimming required for attachment or to make material flashing flush or levelwith offsets and/or transitions shall be incorporated in the flashing specifications.
3.14 BASE FLASHING (APPROXIMATELY 8" IN HEIGHT MINIMUM)
A.Base flashings shall be installed using the flashing membrane, with length of run not toexceed eight linear feet (8').
B.Wooden nailers or curbs shall be installed at all edges and openings in the roof, mechanicallyfastened to the deck.
C.Cant strips shall be installed at the intersection of the deck and all vertical surfaces.
D.The roofing field membrane shall extend up over and a minimum two inches (2") above the
top of cant strips at all vertical intersections or out to the roof's edge.
E.All flashings shall be mechanically fastened with a termination bar a maximum of six inches(6") on center, be a maximum of forty inches (40") above finished roof height, extend aminimum of four inches (4") / eight inches (8") onto the field of horizontal roof membrane, andnot exceed eight linear feet (8') of run in length.
F.All vertical flashing butted seams of the flashing membrane shall be covered with a six inch(6”) trim strip and hot-air welded.
G.All flashing membrane shall be adhered with flashing bonding adhesive to the verticalsubstrate and hot-air welded to the field of roof membrane; hot-air weld six inch (6”) trim stripover the butted vertical seams/laps.
H.Flashing welds shall be a minimum two inch (2") width, no maximum.
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I.Hot-Air Welding of Flashing:1.When using a hand-held hot-air welder, the seams should be pressed together using ahand-held roller. The speed and temperature settings of the welding equipment can beaffected by the weather conditions at the site of application, therefore, theseparameters should be set by trial and error using two (2) pieces of the flashingmembrane.Minimum width of hot-air weld two inches (2"), no maximum.
2.Lay the membranes together and apply pressure to the welded seam to ensure fulladhesion.3.Allow the seams to set fully, and probe the entire length for voids. Reseam voidsimmediately with a hot-air gun and roller.
J.All hot-air welded seams/laps shall be tested daily with a probe for integrity,novariance.
3.15 VERTICAL WALL FLASHING (FOR USE APPROXIMATELY 8-18" ABOVE THE FINISHED ROOFLINE AND EXTENDING UPWARD)
A.Flashing membrane shall be installed on the vertical beginning a minimum of eight inches (8")
above the finished roof line (where the base flashing is terminated), with length of run not toexceed twenty feet (20'). Flashing shall be installed in strict accordance with themanufacturer's recommendations.
B.The termination bar used to terminate the minimum eight inch (8") high base flashing shall becovered with the lower edge of the upper vertical flashing. This will cause the termination bar
to be buried at the termination point. The selvedge edge of the upper flashing shall be hot-airwelded to the base flashing membrane. Care should be taken to ensure the top edge of thebase flashing and bottom edge of the vertical flashing are both secured.
C.The vertical wall flashing membrane shall be set in flashing bonding adhesive according tomanufacturer's guidelines.
D.All vertical flashing joints shall be butted together and covered with 6” trim strip and hot-airwelded to the flashing membrane.
E.Flashing welds shall be minimum two inch (2") width, no maximum.
F.Immediately following the laying of the flashing membrane, it shall be pressed or rolled in thewidth direction of the membrane. This will prevent excessive entrapment of air beneath themembrane. The pressing or rolling shall be in the width direction and with the laps so as notto buck the laps.
G.Any flashing extending further than eighteen inches (18") up onto a vertical surface shall beinstalled using a hidden termination bar. The termination bar used to terminate the firstflashing shall be covered by the lower edge of the upper vertical flashing and the selvedgeedge shall be hot air welded to the lower flashing. This will cause the termination bar to behidden at the termination point. Care should be taken to ensure the top edge of the bottomflashing and bottom edge of the upper vertical flashing are both secured. The upper flashingshall be installed and extended up and over the parapet wall and fastened to the nailer on theoutside of the wall.
H.The flashing membrane shall be run up the wall in lengths not to exceed twenty (20’) linearfeet, run under the coping cap and be terminated on the outside of the wall six inches (6") oncenter; then the coping cap shall be reset. All vertical butt joints are to be stripped in with the6” trim strip and hot-air welded.
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I.Hot-air Welding Laps/Joints/Seams:1.When using a hand-held hot-air welder, the seams should be pressed together using ahand-held roller. The speed and temperature settings of the welding equipment can beaffected by the weather conditions at the site of application, therefore, theseparameters should be set by the contractor by using two (2) pieces of flashingmembrane. Minimum width of hot-air weld shall be two inches (2").
2.Lay the laps together and apply pressure to the welded seam to ensure full adhesion.3.Allow the seams to set fully, and probe the entire length for voids. Reseam voidsimmediately with a hot-air gun and roller.
J.All hot-air welded seams/joints/laps shall be tested daily with a probe for integrity,novariance.
K.Any lumber or shimming required for attachment or to make material flashing flush or levelwith offsets and/or transitions shall be incorporated in the flashing specifications.
3.16 PROJECTION FLASHINGS
A.Plumbing Vents: Soil vent stack pipes shall receive new lead flashings installed in strictaccordance with practices set forth in the NRCA Roofing Manual. The lead shall be carriedup and over the top of the stack, and crimped down into the pipe to form a watertight seal.Projections that cannot be sealed thus should be boxed in and flashed as recommended bythe roof membrane manufacturer.
B.Square Projections: Lay the 60 mil coal-tar elastomeric membrane (CTEM) up to theprojection, and cut membrane so that it will extend twelve inches (12") beyond theprojection. Cut a slit in the membrane to correspond with the position of the projection, andlay the membrane in hot asphalt. Apply another layer of membrane in exactly the samefashion, but from the opposite direction. For metal flange-type projections, after doingabove, strip in with six inch (6") strips of membrane.
C.Round Projections: Cut membrane square and eighteen inches (18") from perimeter ofprojection. Slit square membrane with an "X" of proper size to ensure a close fit andpositive seal. Place over projection, and adhere to clean membrane already on the roof.Cut a six inch (6") piece of membrane to apply as a collar, and secure with an all stainlesssteel clamp.
3.17 CURB FLASHINGS
A.The flashing substrate shall be free of any dirt and loose material.
B.The underlayment ply or plies and the coal-tar elastomeric membrane (CTEM) shall bebrought to two inches (2") past the top of the cant strip and adhered.
C.Starting on the roof at least six inches (6") from the roofside edge of the cant strip, adhereone(1) ply of Type IV ply sheet extending over the cant and up the vertical a minimum ofeight inches (8"). Each lap of the ply sheet shall be a minimum of three inches (3").
D.Over the Type IV ply sheet starting on the roof at least eight inches (8") from the roofsideedge of the cant strip, adhere the coal-tar elastomeric membrane (CTEM) extending overthe cant and up the vertical a minimum of eight inches (8"). Each lap of the coal-tarelastomeric membrane (CTEM) shall be a minimum of three inches (3"),hot-air welded,and shall not coincide with the laps of the underlayment sheet.
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E.Fasten the top edge of the flashings on six inch (6") centers using approved termination barand fasteners.
F.An NRCA-approved metal counterflashing shall extend down over the flashing a minimumof four inches (4").
3.18 EDGING FLASHINGS
A.An NRCA-approved gravel stop/fascia system shall be installed in strict accordance withpublishedinstructionsper local code.
B.The 60 mil coal-tar elastomeric field membrane (CTEM) shall extend a minimum of one
inch (1") below the base of the nailer, and be fastened six inches (6") on center. A metaledge of proper gauge and dimensions shall be mechanically fastened, using a continuousclip fastened six inches (6") on center, to the wood nailer over the membrane. The metalshall have a minimum of a three inch (3") flange, set in asphalt mastic and fastened intonailer a minimum of six inches (6") on center, and a minimum of a four inch (4") fascia(match existing). The lower elevation of the metal edge shall extend a minimum of one
inch (1") below the juncture of the bottom edge of the wood nailer and adjoining wallsurface. The metal edge shall have a minimum of one inch (1") gravel stop.
C.All metal coming in contact with bituminous material shall be primed. Strip metal edgeflange with one strip of Type IV fiberglass felt set in hot bitumen extending inward from thelip of the gravel guard a minimum of three inches (3") past metal flange. Strip in fiberglass
felt with 60 mil coal-tar elastomeric membrane (CTEM) flashing from the lip of the gravelguardto a minimum of three inches (3") past the edge of the fiberglass underlayment usinghot bitumen. At the leading edge of the CTEM along the lip of the gravel guard, a liberalbead of silyl-terminated polyether sealant shall be applied.1.NOTE: If internal flange of metal edge detail is tapered, CTEM self-adheredmembrane shall be used in lieu of the 60 mil CTEM. Any laps of the CTEM
self-adhered membrane shall be covered with a four inch (4") wide piece of the 60 milCTEM field membrane centered over the lap, hot-air welded and extending the fulllength of the lap. At the top leading edge where the self-adhered CTEM membranedoes not have a selvedge edge for welding CTEM to CTEM, a liberal bead of silyl-terminated polyether sealant shall be applied.
D.The coal-tar elastomeric membrane (CTEM) finishing strip shall have a minimum of fourinch (4") lap joints that are staggered from any joints in the gravel guard.
3.19 PIPING/CONDUIT
A.Piping/conduit shall be raised to NRCA recommended heights, and new supportsfurnished. Permanent supports shall be installed upon pads approved by membranemanufacturer. Coordinate work with Project Manager/Architect.
B.All gas lines, piping, and conduits shall be coated with industrial grade yellow paint.
3.20 PIPE/EQUIPMENT SUPPORTS
A.All gas lines, piping, and conduit must be supported on specified stands or hangars.
B.Supports shall be attached to pipes with oversized strapping.
C.Designated pipe/equipment supports shall be removed and replaced with new.
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D.Verify that roof surface is smooth and clean to extent needed to receive materials. Surfaceshall be cleaned by removing any loose gravel and any foreign matter.
E.Install support systems in accordance with manufacturer's instructions and approved shopdrawings. Accurately locate and align pre-fabricated pipe supports in locations specified asper approved shop drawings. Pipe supports shall be placed not to exceed ten feet (10') on
center and within two feet (2") of all elevation changes,intersections, and corners.
F.Supports shall be set on a double layer of membrane, adhered to the roof surface usingspecified silyl-terminated polyester sealant, unless noted otherwise by supportmanufacturer.
G.Provide bond breaker between dissimilar metals.
3.21 EXPANSION JOINT
A.Expansion joints at walls and field of the roof shall be curbed as outlined in accordance withNRCA and SMACNA guidelines. The curbs will be flashed as outlined above in Curb
Flashings.
3.22 SURFACE FINISH
A.Flood Coat and Aggregate: Shall be applied at the minimum rate of five hundred pounds(500#) per one hundred (100) square feet set in hot (liquid) flood coat of steep asphalt
Type IV applied at the minimum rate of sixty pounds (60#) per one hundred (100) squarefeet.
3.23 MEMBRANE PROTECTION
A.Walk Way Pads: Install manufacturer's walk way pads continuously on each side of each
air-handling/mechanical unit on the roof in accordance with the manufacturer'srecommended procedures.
B.Where equipment pads,wood sleepers, or walkway slabs are to be installed over theroofing membrane, an additional layer of the roofing membrane shall be installed betweenthe roofing membrane and the pad, sleeper, or slab. Due caution shall be exercised to
prevent roofing membrane damage during placement. Where required, membrane shall bewelded to field membrane to prevent slippage.
3.24 ROOF PLAQUE
A.Metal plaque shall be installed on the underside of each roof hatch or on the inside of themaintenance room door.Location of plaque to be determined by ProjectManager/Architect.
B.Plaque shall be fastened with stainless steel screws that are short enough to not penetrateouter surface of hatch or door where mounted.
3.25 TERMINATION OF NEW ROOF TO EXISTING
A.The final juncture of the new roof shall consist of an NRCA recommended area dividersuitably flashed and sealed for a permanent watertight installation. A water cutoff shall beincorporated into the termination to prevent water entering the existing roof from migratinginto the new roof system.
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3.26 OVERNIGHT SEAL
A.Provide temporary weather protection during interval between demolition and removal ofexisting construction on exterior surfaces and installation of new construction to ensure thatno water leakage or damage occurs to structure or interior areas of existing building.
B.Installation shall be performed according to accepted roofing practice as outlined in theNRCA Roofing Manual.
END OF SECTION 07530
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