2009-032sAour documents\ordinances\08\energy code ordinance.doc
ORDINANCE NO.
AN ORDINANCE OF THE CITY OF DENTON, TEXAS AMENDING SECTION 28-27 OF
THE CODE OF ORDINANCES TO PROVIDE FOR THE ADOPTION OF THE 2006
INTERNATIONAL ENERGY CONSERVATION CODE, AS PUBLISHED BY THE
INTERNATIONAL CODE COUNCIL; PROVIDING FOR AMENDMENTS THERETO;
PROVIDING FOR A PENALTY FOR VIOLATION OF A FINE NOT TO EXCEED $2000.00;
PROVIDING FOR A SEVERABILITY CLAUSE; REPEALING ALL ORDINANCES IN
CONFLICT THEREWITH; AND PROVIDING FOR AN EFFECTIVE DATE.
SECTION 1. Chapter 28, Section 28-253 of the Code or Ordinances of the City of
Denton is hereby added so that said section shall hereafter be and read as follows: Adoption of
the Energy Conservation Code. The International Energy Conservation Code, 2006 edition as
published by the International Code Council, a copy which shall be filed in the Office of the City
Secretary and available for public inspection, is hereby adopted and designated as the Energy
Conservation Code for the City of Denton, the same as though the edition of such code were
copied at length herein subject to the deletions and amendments enumerated in section 28-254.
Section 28-28 is hereby amended to read as follows:
Amendments to the
2006 International Energy Conservation Code
(1) Amend Section 101.4.2 Historic Buildings to read as follows:
101.4.2 Historic Buildings. Any building or structure that is listed in the State or National
Register of Historic Places; designated as a historic property under local or state designation law
or survey; certified as a contributing resource with a National Register listed or locally
designated historic district; or with an opinion or certification that the property is eligible to be
listed on the National or State Registers of Historic Places either individually or as a contributing
building to a historic district by the State Historic Preservation Officer of the Keeper of the
National Register of Historic Places, shall comply with all of the provisions of this code.
Exception: Whenever a provision or provisions shall invalidate or
jeopardize the historical designation or listing, that provision or provisions
may be exempted.
(2) Amend Section 103.1.1 Above code programs to read as follows:
103.3.1.1 Alternative compliance. A building certified by a national, state, or local accredited
energy efficiency program and determined by the Energy-Systems Laboratory to be in
compliance with the energy efficiency requirements of this section may, at the option of the
Code Official, be considered in compliance. The United States Environmental Protection
Agency's Energy Star Program certification of energy code equivalency shall be considered in
compliance.
sAour documents\ordinances\08\energy code ordinance.doc
(3) Amend SECTION 202 GENERAL DEFINITIONS by adding the following
definition:
GLAZING AREA. Total area of the glazed fenestration measured using the rough opening and
including sash, curbing or other framing elements that enclose conditioned space. Glazing area
includes the area of glazed fenestration assemblies in walls bounding conditioned basements.
For doors where the daylight opening area is less that 50 percent of the door area, the glazing
area is the daylight opening area. For all other doors, the glazing area is the rough opening area
for the door including the door and the frame.
(4) Amend Section 301.1 to read as follows:
301.1 General. Climate zones from Figure 301.1, Figure 301.2, Table 301.1(1), Table 301.2(1),
or Table 301.3(3) shall be used in determining the applicable requirements from Chapters 4 & 5.
Locations not in Table 301.1 (outside the US) shall be assigned a climate zone based on Section
301.3.
(5) Amend the code by inserting FIGURE 301.2 -TEXAS CLIMATE ZONES
immediately following Figure 301.1:
2
sAour documents\ordinances\08\energy code ordinance.doc
FIGURE 301.2: TEXAS CLIMATE ZONES
(6) Amend TABLE 301.1 CLIMATE ZONES BY STATE, COUNTY AND
TERRITORIES by deleting the references to Texas and add TABLE 301.1(1) CLIMATE
ZONES AND SUB CLIMATE ZONES FOR TEXAS:
TABLE 301.1(1) CLIMATE ZONES AND SUB CLIMATE ZONES FOR TEXAS
Zone 2
ANDERSON
2.2
DE WITT
2.1
JIM HOGG
2.1
ORANGE
2.2
ANGELINA
2.2
DIMMIT
2.1
JIM WELLS
2.1
POLK
2.2
ARANSAS
2.1
DUVAL
2.1
KARNES
2.1
REAL
2.2
ATASCOSA
2.1
EDWARDS
2.2
KENEDY
2.1
REFUGIO
2.1
AUSTIN
2.2
FALLS
2.2
KINNEY
2.2
ROBERTSON
2.2
BANDERA
2.2
FAYETTE
2.2
KLEBERG
2.1
SAN JACINTO
2.2
SAN
BASTROP
2.2
FORT BEND
2.2
LA SALLE
2.1
PATRICIO
2.1
BEE
2.1
FREESTONE
2.2
LAVACA
2.2
STARR
2.1
BELL
2.2
FRIO
2.1
LEE
2.2
TRAVIS
2.2
BEXAR
2.2
GALVESTON
2.1
LEON
2.2
TRINITY
2.2
3
DRY (B) MOIST (A)
sAour documents\ordinances\08\energy code ordinance.doc
BOSQUE
2.2
GOLIAD 2.1
LIBERTY
2.2
TYLER 2.2
BRAZORIA
2.1
GON
ZALES 2.2
LIMESTONE
2.2
UVA
LDE 2.2
BRAZOS
2.2
GRIMES 2.2
LIVE OAK
2.1
VAL
VERDE 2.2
BROOKS
2.1
GUA
DALUPE 2.2
MADISON
2.2
VICTORIA 2.1
BURLESON
2.2
HARDIN 2.2
MATAGORDA
2.1
WALKER 2.2
CALDWELL
2.2
HARRIS 2.2
MAVERICK
2.1
WALLER 2.2
CALHOUN
2.1
HAY
S 2.2
MCLENNAN
2.2
WASHINGTON 2.2
CAMERON
2.1
HIDALGO 2.1
MCMULLEN
2.1
WEBB 2.1
CHAMBERS
2.2
HILL
2.2
MED
INA
2.2
WHARTON 2.1
CHEROKEE
2.2
HOU
STON 2.2
MILAM
2.2
WILLACY 2.1
COLORADO
2.2
JACKSON 2.1
MONTGOMERY
2.2
WILLIAMSON 2.2
COMAL
2.2
JASP
ER 2.2
NEWTON
2.2
WILSON 2.2
CORYELL
2.2
JEFFERSON 2.2
NUECES
2.1
ZAPATA 2.1
Zone 3
ANDREWS
3.2
EL PASO
3.2
KERB
3.1
ROCKWALL
3.2
ARCHER
3.3
ELLIS
3.2
KIMBLE
3.1
RUNNELS
3.2
BAYLOR
3.3
ERATH
3.2
KING
3.3
RUSK
3.2
BLANCO
3.1
FANNIN
3.2
KNOX
3.3
SABINE
3.2
BORDEN
3.3
FISHER
3.2
LAMAR
3.2
SAN AUGUSTINE
3.2
BOWIE
3.2
FOARD
3.3
LAMPASAS
3.2
SAN SABA
3.2
BREWSTER
3.1
FRANKLIN
3.2
LLANO
3.1
SCHLEICHER
3.1
BROWN
3.2
GAINES
3.3
LOVING
3.2
SCURRY
3.3
BURNET
3.1
GARZA
3.3
LUBBOCK
3.3
SHACKELFORD
3.2
CALLAHAN
3.2
GILLESPIE
3.1
LYNN
3.3
SHELBY
3.2
CAMP
3.2
GLASSCOCK
3.2
MARION
3.2
SMITH
3.2
CASS
3.2
GRAYSON
3.2
MARTIN
3.2
SOMERVELL
3.2
CHILDRESS
3.3
GREGG
3.2
MASON
3.1
STEPHENS
3.2
CLAY
3.3
HALL
3.4
MCCULLOCH
3.2
STERLING
3.2
COKE
3.2
HAMILTON
3.2
MENARD
3.1
STONEWALL
3.3
COLEMAN
3.2
HARDEMAN
3.3
MIDLAND
3.2
SUTTON
3.1
COLLIN
3.2
HARRISON
3.2
MILLS
3.2
TARRANT
3.2
COLLINGSWORTH
3.3
HASKELL
3.2
MITCHELL
3.2
TAYLOR
3.2
COMANCHE
3.2
HEMPHILL
3.4
MONTAGUE
3.2
TERRELL
3.1
CONCHO
3.2
HENDERSON
3.2
MORRIS
3.2
TERRY
3.3
COOKE
3.2
HOOD
3.2
MOTLEY
3.3
THROCKMORTON
3.2
COTTLE
3.3
HOPKINS
3.2
NACOGDOCHES
3.2
TITUS
3.2
CRANE
3.2
HOWARD
3.2
NAVARRO
3.2
TOM GREEN
3.2
CROCKETT
3.1
HUDSPETH
3.2
NOLAN
3.2
UPS14UR
3.2
CROSBY
3.3
HUNT
3.2
PALO PINTO
3.2
UPTON
3.2
CULBERSON
3.2
IRION
3.2
PANOLA
3.2
VAN ZANDT
3.2
DALLAS
3.2
JACK
3.2
PARKER
3.2
WARD
3.2
DAWSON
3.3
JEFF DAVIS
3.2
PECOS
3.2
WHEELER
3.4
DELTA
3.2
JOHNSON
3.2
PRESIDIO
3.1
WICHITA
3.3
DENTON
3.2
JONES
3.2
RAINS
3.2
WILBARGER
3.3
DICKENS
3.3
KAUFMAN
3.2
REAGAN
3.2
WINKLER
3.2
4
sAour documents\ordinances\08\energy code ordinance.doc
EASTLAND
3.2 KENDALL
3.1 RED RIVER
3.2 WISE 3.2
ECTOR
3.2 KENT
3.3 REEVES
3.2 WOOD 3.2
YOUNG 3.2
Zone 4
ARMSTRONG
DEAF SMITH
HOCKLEY
PARMER
BAILEY
DONLEY
HUTCHINSON
POTTER
BRISCOE
FLOYD
LAMB
RANDALL
CARSON
GRAY
LIPSCOMB
ROBERTS
CASTRO
HALE
MOORE
SHERMAN
COCHRAN
HANSFORD
OCHILTREE
SWISHER
DALLAM
HARTLEY
OLDHAM
YOAKUM
(7) Amend TABLE 301.2 WARM
HUMM COUNTIES
AND TERRITORIES by
deleting the
references to Texas
and add TABLE
301.2(1) WARM HUMID
COUNTIES FOR TEXAS
TABLE 301.2(1) WARM HUMID COUNTIES FOR TEXAS
ANDERSON
2.2
DUVAL
2.1
KAUFMAN
3.2
RED RIVER
3.2
ANGELINA
2.2
EDWARDS
2.2
KENDALL
3.1
REAL
2.2
ARANSAS
2.1
ELLIS
3.2
KENEDY
2.1
REFUGIO
2.1
ATASCOSA
2.1
ERATH
3.2
KINNEY
2.2
ROBERTSON
2.2
AUSTIN
2.2
FALLS
2.2
KLEBERG
2.1
ROCKWALL
3.2
BANDERA
2.2
FAYETTE
2.2
LA SALLE
2.1
RUSK
3.2
BASTROP
2.2
FORT BEND
2.2
' LAMAR
3.2
SABINE
3.2
SAN
BEE
2.1
FRANKLIN
3.2
LAMPASAS
3.2
AUGUSTINE
3.2
BELL
2.2
FREESTONE
2.2
LAVACA
2.2
SAN JACINTO
2.2
BEXAR
2.2
FRIO
2.1
LEE
2.2
SAN PATRICIO
2.1
BLANCO
3.1
GALVESTON
2.1
LEON
2.2
SAN SABA
3.2
BOSQUE
2.2
GILLESPIE
3.1
LLANO
3.1
SHELBY
3.2
BOWIE
3.2
GOLIAD
2.1
LIBERTY
2.2
SMITH
3.2
BRAZORIA
2.1
GONZALES
2.2
LIMESTONE
2.2
STARR
2.1
BROWN
3.2
GREGG
3.2
LIVE OAK
2.1
SOMMERVELL
3.2
BRAZOS
2.2
GRIMES
2.2
MADISON
2.2
TARRANT
3.2
BROOKS
2.1
GUADALUPE
2.2
MARION
3.2
TITUS
3.2
BURLESON
2.2
HAMILTON
3.2
MATAGORDA
2.1
TRAVIS
2.2
BURNET
3.1
HARDIN
2.2
MAVERICK
2.1
TRINITY
2.2
CALDWELL
2.2
HARRIS
2.2
MCLENNAN
2.2
TYLER
2.2
CALHOUN
2.1
HARRISON
3.2
MCMULLEN
2.1
UPSHUR
3.2
CAMERON
2.1
HAYS
2.2
MEDINA
2.2
UVALDE
2.2
CHAMBERS
2.2
HENDERSON
3.2
MILAM
2.2
VAL VERDE
2.2
CAMP
3.2
HIDALGO
2.1
MILLS
3.2
VAN ZANDT
3.2
CASS
12
HOOD
3.2
MONTGOMERY
2.2
VICTORIA
2.1
CHEROKEE
2.2
HOPKINS
3.2
MORRIS
3.2
WALKER
2.2
COLLIN
3.2
HILL
2.2
NACOGDOCHES
3.2
WALLER
2.2
5
sAour documents\ordinances\08\energy code ordinance.doc
COLORADO
2.2
HOUSTON
2.2
NAVARRO
3.2
WASHINGTON
2.2
COMAL
2.2
HUNT
3.2
NEWTON
2.2
WEBB
2.1
COMANCHE
3.2
JACKSON
2.1
NUECES
2.1
WHARTON
2.1
CORYELL
2.2
JASPER
2.2
ORANGE
2.2
WILLACY
2.1
DALLAS
3.2
JEFFERSON
2.2
PALO PINTO
3.2
WILLIAMSON
2.2
DELTA
3.2
JIM HOGG
2.1
PANOLA
3.2
WILSON
2.2
DENTON
3.2
JIM WELLS
2.1
PARKER
3.2
WOOD
3.2
DE WITT
2.1
JOHNSON
3.2
POLK
2.2
ZAPATA
2.1
DIMMIT
2.1
KARNES
2.1
RAINS
3.2
ZAVALA
2.1
(8) Amend Section 401.2 Compliance. to read as follows:
401.2 Compliance. As a minimum, projects shall comply with Sections 401, 402.4, 402.5, 402.6
and 403 (referred to as the mandatory provisions) and either:
1. Sections 402.1 through 402.3 (prescriptive); or
2. Section 404 (performance); and
3. Demonstrate surpassing the minimum compliance of this code by 10% or more.
(9) Add Section 401.2.1. Compliance software tools. to read as follows:
401.2.1. Compliance software tools. Software tools used to demonstrate energy code
compliance that are deemed acceptable by the building official. The PNL program RES Check is
not acceptable for residential compliance.
(10) Amend Section 402.1.1 Insulation and fenestration criteria. to read as follows:
402.1.1 Insulation and fenestration criteria. The building thermal envelope shall meet the
requirements of Table 402. 1.1 based on the climate zone specified in Chapter 3. The use of
REScheckTM shall not be an acceptable means of demonstrating envelope compliance.
When compliance using Table 402.1.1 is demonstrated with a ceiling R-value of R30 or less, no
more than 33% of the total projected ceiling area may be of cathedral type construction (ceiling
joist/roof rafter assembly) and the required insulation R-value may be reduced to a minimum of
R22 insulation when the remaining ceiling area insulation is increased to R38.
(11) Amend TABLE 402.1.1 INSULATION AND FENESTRATION REQUIREMENTS
BY COMPONENT to read as follows:
TABLE 402.1.1
INSULATION AND FENESTRATION RF.nTTMVMFNTC RV VnNrnnNFNT CrVYAe-1
MAX
GLAZED
MASS
CLIMATE
AREA TO
MAX
MAX
WALL
MIN MIN
MIN
- SUB
WALL
GLAZED
SKYLIGHT
MAX GLAZED
MIN
MIN WOOD
R-
FLOOR BASEMENT
MIN SLAB
CRAWL SPACE
CLIMATE
AREA
FENESTRATION
U-
FENESTRATION
CEILING
FRAME WALL
VALUE
R- WALL
R-VALUE
WALL
ZONE
RATIO
U-FACTOR
FACTOR'
SHGC
R-VALUE
R-VALUE d
VALUE R-VALUE
& DEPTH`
R-VALUE
2
1
15
0.75
0.75
0.38
19
13
6
19 0
0
5
.
20
0.70
0.75
0.38
30
13
6
19 0
0
5
6
sAour documents\ordinances\08\energy code ordinance.doc
25
0.65
0.75
0.35
30
13
6
19
0
0
5
30
0.54
0.75
0.35
38
13
6
19
0
0
5
15
0.65
0.75
0.38
30
13
6
19
5
0
6
20
0.65
0.75
0.38
38
13
6
19
6
0
6
2.2
25
0.54
0.75
0.35
38
13
6
19
8
0
10
30
0.46
0.75
0.35
38
16, 13+3.7 e
6
19
.8 .
0
10
15
0.65
0.65
0.40
30
13
6
19
5
0
6
20
0.55
0.65
0.40
38
13
6
19
5
0
6
3.1
25
0.54
0.65
0.35
38
13
6
19
8
0
10
30
0.46
0.65
0.35
38
16, 13 + 3.7e
7
19
8
0
10
15
0.60
0.65
0.40
38
13
6
19
6
0
7
20
0.54
0.65
0.40
38
13
6
19
6
0
7
3.2
25
0.51
0.65
0.40
38
16, 13+3.7 e
7
19
6
0
7
30
0.46
0.65
0.38
38
16, 13 + 3.7e
7
19
6
0
7
15
0.51
0.65
0.40
30
13
6
19
7
0
8
20
0.45
0.65
0.40
38
13
6
19
7
0
9
3.3
25
0.40
0.65
0.40
38
16, 13 + 3.7e
7
19
7
0
9
30
0.40
0.65
0.40
38
19, 13+8. le
9
19
7
0
9
15
0.45
0.60
NR
38
13
6
19
8
5, 2 ft
11
20
0.37
0.60
NR
38
13
6
19
8
6, 2 ft
13
3.4
25
0.37
0.60
NR
38
19, 13+8. le
9
19
8
6, 2 ft
13
30
0.37
0.60
NR
38
19, 13+8. , e
9
30
8
6, 2 ft
13
15
0.45
0.60
NR
38
13
8
19
8
5, 2 ft
11
20
0.37
0.60
NR
38
13
8
19
9
6, 2 ft
13
4
25
0.37
0.60
NR
38
19, 13+8. le
10
19
9
6, 2 ft
13
30
0.37
0.60
NR
38
19, 13 + 8.1 a
10
30
9
6, 2 ft
13
For SI: 1 foot = 304.8 mm.
a. R-values are minimums. U-factors and SHGC are maximums. R-19 shall be permitted to
be compressed into a 2 x 6 cavity.
b. The fenestration U-factor column. excludes skylights. The SHGC column applies to all
glazed fenestration.
c. R-5 shall be added to the required slab edge R-values for heated slabs.
d. The total R-value may be achieved with a combination of cavity insulation and insulating
sheathing that covers 100% of the exterior wall.
e. The wall insulation may be the sum of the two values where the first value is the cavity
insulation and the second value is insulating sheathing. The combination of cavity
insulation plus insulating sheathing may be used where structural sheathing covers not
more than 25% of the exteri or wall area and insulating sheathing is not required where
structural sheathing is used. If structural sheathing covers more than 25% of exterior
wall area then the wall insulation requirement may only be satisfied with the single
insulation value.
(12) Amend TABLE 402.1.3 EQUIVALENT U-FACTORS to read as follows:
7
sAour documents\ordinances\08\energy code ordinance.doc
TABLE 402.1.3
FnTJTVAT.F,NT TT-FAC'TORC
CLIMATE-
SUB
CLIMATE
ZONE
MAX
GLAZED
AREA TO
WALL AREA
RATIO
MAX
GLAZED
FENESTRATION
U-FACTOR
AX
SKYLIGHT
U-FACTOR
AX
CEILING
U-FACTOR
AX WOOD
FRAME WALL
U-FACTOR
MAX
MASS
WALL
U-
FACTOR
AX
FLOOR
U-FACTOR
MAX
BASEMENT
WALL
U-FACTOR
MAX
CRAWL
SPACE
WALL
U-FACTOR
15
0.75
0.75
0.039
0.082
0.124
0.047
0.360
0.136
2
1
20
0.70
0.75
0.034
0.082
0.124
0.047
0.360
0.136
.
25
0.65
0.75
0.034
0.082
0.124
0.047
0.360
0.136
30
0.54
0.75
0.030
0.082
0.124
0.047
0.360
0.136
15
0.65
0.75
0.034
0.082
0.124
0.047
0.210
0.100
2
2
20
0.65
0.75
0.030
0.082
0.124
0.047
0.210
0.100
.
25
0.54
0.75
0.030
0.082
0.124
0.047
0.119
0.065
30
0.46
0.75
0.030
0.071
0.124
0.047
0.119
0.065
15
0.65
0.65
0.034
0.082
0.124
0.047
0.210
0.100
3
1
20
0.55
0.65
0.030
0.082
0.124
0.047
0.210
0.100
.
25
0.54
0.65
0.030
0.082
0.124
0.047
0.119
0.065
30
0.46
0.65
0.030
0.071
0.112
0.047
0.119
0.065
15
0.60
0.65
0.034
0.082
0.124
0.047
0.179
0.075
3
2
20
0.54
0.65
0.030
0.082
0.124
0.047
0.179
0.075
.
25
0.51
0.65
0.030
0.071
0.112
0.047
0.179
0.075
30
0.46
0.65
0.030
0.071
0.112
0.047
0.179
0.075
15
0.51
0.65
0.034
0.082
0.124
0.047
0.149
0.061
3
20
0.45
0.65
0.030
0.082
0.124
0.047
0.149
0.058
.3
25
0.40
0.65
0.030
0.075
0.112
0.047
0.149
0.058
30
0.40
0.65
0.030
0.061
0.094
0.047
0.149
0.058
15
0.45
0.60
0.030
0.082
0.124
0.047
0.119
0.083
3
4
20
0.37
0.60
0.030
0.082
0.124
0.047
0.119
0.152
.
25
0.37
0.60
0.030
0.061
0.094
0.047
0.119
0.152
30
0.37
0.60
0.030
0.061
0.094
0.033
0.119
0.152
15
0.45
0.60
0.030
0.082
0.102
0.047
0.119
0.083
4
20
0.37
0.60
0.030
0.082
0.102
0.047
0.089
0.152
25
0.37
0.60
0.030
0.061
0.087
0.047
0.089
0.152
30
0.37
0.60
0.030
0.061
0.087
0.033
0.089
0.152
a. Nonfenestration U-factors shall be obtained from measurement, calculation or an
approved source.
(13) Add Section 402.2.11. Insulation installed in walls. to read as follow:
Section 402.2.11. Insulation installed in walls. Insulation batts installed in walls shall be
totally surrounded by an enclosure on all sides consisting of framing lumber, gypsum, sheathing,
wood structural panel sheathing or other equivalent material approved by the building official.'
(14) Amend Section 402.3.2 Glazed fenestration SHGC. to read as follows:
402.3.2 Glazed fenestration SHGC. An area-weighted average of fenestration products more
than 50 percent glazed shall be permitted to satisfy the SHGC requirements. In sub climate
zones 2.1, 2.2, 3.1, 3.2 and 3.3 the maximum area-weighted average and the maximum SHGC
shall not exceed 0.40.
(15) Amend Section 402.3.3 Glazed fenestration exemption. to read as follows:
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402.3.3 Glazed fenestration exemption. Up to 1 percent of glazed fenestration per dwelling
unit shall be permitted to be exempt from U-factor and SHGC requirements in Section 402.1.
(16) Amend Section 402.3.5 Thermally isolated sunroom U-factor. to read as follows:
Section 402.3.5 Thermally isolated sunroom. New windows and doors separating the sunroom
from conditioned space shall meet the building thermal envelope requirements.
(17) Amend Section 402.3.6 Replacement fenestration. to read as follows:
Section 402.3.6 Replacement fenestration. Where some or all of an existing fenestration unit
is replaced with a new fenestration product, including sash and glazing, the replacement
fenestration unit shall meet the applicable requirements for U-factor in Table 402.3.7.
Exceptions:
1. Replacement skylights shall have a maximum U-factor for 0.60 when installed in
all sub climate zones except for 2.1.
2. For buildings constructed in conformance with an energy code as required by
State of Texas Senate Bill Number 5, 77th Legislature, replacement fenestration
units may comply with the original construction documents or applicable U-factor
in Table 402.1.1.
(18) Add Section 402.3.7 Prescriptive path for additions. to read as follows:
Section 402.3.7 Prescriptive path for additions. As an alternative for demonstrating
compliance, additions with a conditioned floor area less than 500 square feet (46.5 m2) to
existing single-family residential buildings and structures shall meet the prescriptive envelope
component criteria in Table 402.3.7 for the sub climate zone applicable to the location. The U-
factor of each individual fenestration product (windows, doors and skylights) shall be used to
calculate and area-weighted average fenestration product U-factor for the addition, which shall
not exceed the applicable listed values in Table 402.3.7. For additions, other than sunroom
additions, the total area of fenestration products shall not exceed 40 percent of the gross wall and
roof area of the addition. The R-values for opaque thermal envelope components shall be equal
to or greater than the applicable listed values in Table 402.3.7.
Conditioned sunroom additions shall maintain thermal isolation; shall not be used as kitchens or
sleeping rooms.
In sub climate zones 2.1, 2.2, 3.1, 3.2 and 3.3, the combined solar heat gain coefficient (the area
weighted average) of all glazed fenestration products used in additions and as replacement
windows in accordance with this section shall not exceed 0.40.
(19) Add Table 4023.7 PRESCRIPTIVE ENVELOPE COMPONENT CRITERIA
ADDITIONS TO AND REPLACEMENT WINDOWS FOR EXISTING
DETACHED ONE- AND TWO-FAMILY DWELLINGS to read as follows:
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Table 402.3.7 PRESCRIPTIVE ENVELOPE COMPONENT CRITERIA
ADDITIONS TO AND REPLACEMENT WINDOWS FOR EXISTING DETACHED
ONE- AND TWO-FAMILY DWELLINGS
ALAXIMIUM
MINIMUM
Crawl
SUB
Ceiling
Basement
Slab
space
CLIMATE
ZONES
Fenestration
U-factor
R-
values' a
Wall R-
value'
Floor R-
value
wall
R-value b
perimeter
R-value
wall R-
value
2.1
0.75
R-26
R-13
R-11
R-5
R-0
R-5
2.2, 3.1,
0.50
3.2, 3.3
R-30
R-13
R-19
R-8
R-0
R-10
and 3.4
4
0.50
R-38
R-13
R-21
R-10
R-0
R-19
a. "Ceiling R-value" shall be required for flat or inclined (cathedral) ceilings. Floors over
outside air shall meet "Ceiling R-value" requirements.
b. Basement wall insulation to be installed in accordance with Section 402.2.6.
c. "Crawl space wall R-value" shall apply to unventilated crawl spaces only. Crawl space
insulation shall be installed in accordance with Section 402.2.8.
d. Sunroom additions shall be required to have a maximum fenestration U-factor of 0.5. in
all sub climate zones except sub climate zone 2.1. In all sub climate zones, the minimum
ceiling R-value for sunroom additions shall be R-19 and the minimum wall R-value shall
be R-13.
(20) Add Exception No. 2. to Section 403.2.1. Insulation to read as follows:
Section 403.2.1. Insulation. Supply and return ducts shall be insulated to a minimum of R-8.
Ducts in floor trusses shall be insulated to a minimum of R-6.
Exceptions:
1. Ducts or portions thereof located completely inside the building thermal
envelope.
2. Supply and return ducts can be insulated to a minimum of R-6, if the
efficiency of the cooling equipment is upgraded to one SEER point above the
NAECA (National Appliance Energy Conservation Act) Standard.
(21) Add Section 501.3. Compliance software tools. to read as follows:
Section 5013. Compliance software tools. Software tools used to demonstrate energy code
compliance that are deemed acceptable by the building official may only utilize the energy
chapter of the 2006 International Energy Conservation Code or the 2004 Edition of AHSRAE
90.1 Energy Standard for Buildings Except Low-rise Residential Buildings when code edition
and/or standard selection is available.
(22) Amend Section 505.2.1 Interior Lighting Controls. to read as follows:
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505.2.1 Interior lighting controls. Each area enclosed by walls or floor-to-ceiling partitions
shall have at least one manual control for the lighting serving that area. The required controls
shall be located within the area served by the controls or be a remote switch that identifies the
lights served and their status. Each control device shall control a maximum of 2,500 square feet
(232.26 square meters) of floor area for a space 10,000 square feet (929.03 square meters) or less
and a maximum of 10,000 square feet (929.03 square meters) for a space greater than 10,000
square feet (929.03 square meters).
SECTION 2. If any provision of this ordinance or the application thereof to any person
or circumstances is held invalid, such invalidity shall not affect other provision or applications,
and to this end the provision of this ordinance are severable.
SECTION 3. All provisions of the ordinances of the City of Denton in conflict with the
provision of this ordinance are hereby repealed, and all other provisions of the ordinances of the
City or Denton, not in conflict with the provision of this ordinance, shall remain in full force and
effect.
SECTION 4. Any person violating any provision of this ordinance shall, upon
conviction, be fined a sum not to exceed two thousand dollars ($2,000.00). Each day that a
provision of this Ordinance is violated shall constitute a separate and distinct offence.
SECTION 5. This ordinance shall become effective thirty (30) days from the date of its
passage and the City Secretary is hereby directed to cause the caption of this ordinance to be
published twice in the Denton Record-Chronicle, the official newspaper of the City of Denton,
Texas, within ten (10) days of the date of its passage. Notwithstanding this effective date, all
building permits applied for prior to the effective date of this ordinance may operate under the
previous building code standards.
le-Z
PASSED AND APPROVED this the J5
dm of 2009
A-ABU UGUS,k MAYOR
ATTEST:
JENNIFER WALTERS, CITY SECRETARY
B '
AP' OVED S TO LEGAL FORM:
ANITA BURGESS, CITY ATTORNEY
BY: 01 A- 0 se-
11