HomeMy WebLinkAboutOrdinance 17680-08-2007ORDINANCE NUMBER 17680-08-2007
AN ORDINANCE AMENDING THE FORT WORTH BUILDING CODE, BY
PROVIDING FOR SOUND ATTENUATION CONSTRUCTION REQUIREMENTS
NEAR THE NAVAL AIR STATION JOINT RESERVE BASE; PROVIDING
PENALTIES FOR THE VIOLATION THEREOF; PROVIDING THAT THIS
ORDINANCE SHALL BE CUMULATIVE; PROVIDING A SEVERABILITY
CLAUSE; PROVIDING A SAVINGS CLAUSE; PROVIDING FOR PUBLICATION
IN PAMPHLET FORM; PROVIDING FOR PUBLICATION IN THE OFFICIAL
NEWSPAPER; AND PROVIDING AN EFFECTIVE DATE.
WHEREAS, the City of Fort Worth has determined that it is appropriate to protect
pexsons within designated noise sensitive buildings from excessive exterior noise near
airports through regulations of design and construction of such new buildings in the vicinity
of the designated airports;
NOW, THEREFORE, BE IT ORDAINED lBY THE CITY COUNCIL OF THE
CITY OF FORT WORTH, TEXAS, AS FOLLOWS:
SECTION 1.
Section 7-47 of the Code of the City of Fort Worth {1986} is amended by adding a
new Division II to Chapter 12 as follows:
CHAPTER 12
DIVISION II
SOUND INSULATION REQUIREMENTS FOR NOISE
SENSITIVE USES NEAR AIRPORTS
SECTION 1211
GENERAL
1211.1 Scope. The regulations and requirements shall apply to all new residential buildings
and new noise-sensitive non-residential buildings, as defined herein, that are located wholly
or partially within the boundaries of the 65 DNL or greater noise contours as designated in
Figure 1211.1(1).
The term "new" shall apply to new detached buildings built after the effective date of this
ordinance, and shall include later additions or modifications to those same buildings. 'The
term shall also include a Change of Occupancy in existing buildings from anon-protected
occupancy to one of the protected occupancies listed herein.
Buildings in existence prior to the effective date, and additions to ar modifications of those
same buildings, shall not be required to comply, except when a Change of Occupancy from
anon-protected occupancy to one of the protected uses is involved.
SECTION 1212
DEFINITIONS
1212.1 General. The following wards and terms shall, fax the purposes of this chapter and
as used elsewhere in this code, have the meanings shown herein.
Aircraft noise - is generally expressed in terms of it's A-weighted sound level, in units
called "decibels." Strictly speaking, the decibel unit should be abbreviated only by "dB";
however, for clarity "dBA" and "dB(A)" are often used to highlight the fact that the sound
level measurement has been A-weighted.
Noise exposure - in areas around airports is expressed in terms of the Day-Night Average
Sound Level, which is abbreviated by "DNL" in text and "L~," in equations.
NOISE-SENSITIVE NON-RESIDENTIAL BUILDINGS -
1. Nursing homes and hospitals, generally classified as Group I; and
2. Child day care centers, Adult day care centers and schools, generally classified as
Group E and Group I-4.
RESIDENTIAL STRUCTURES: Single-family, Two-family, Townhouse, Multi-family,
and Assisted Living uses, generally classified as Group R, whether in a single occupancy or
mixed occupancy.
Sound insulation properties - of building construction materials are described by Sound
Transmission Loss {TL) or Sound Transmission Class (STC}. The higher the TL ar STC
value, the less sound will be transmitted through the building material.
SECTION 1213
PURPOSE
1213.1 General. All buildings and structures with protective uses, as applicable under this
Division, shall be required to have minimum sound insulation standards and requirements to
protect the persons within designated noise sensitive buildings from excessive exterior noise
through regulation of design, construction and modification of such buildings. After proper
sound insulation measures are taken, the interior sound level, attributable to exterior
sources, shall not exceed 45 dB.
With the request far a building pez7nit application, or Change of Use permit application,
submitted plans shall show evidence of compliance with the sound insulation requirements.
Compliance shall consist of submittal of an acoustical analysis report as follows:
1. In accordance with the prescriptive requirements of Section 1214 or the default
ratings of Section 1215; or
2. Any qualified design prepared under by a person experienced in the field of
acoustical engineering or a registered architect.
SECTION 1214
BUILDING REQUIREMENTS
.1214.1 General. Compliance with the following prescriptive provisions shall be deemed to
be incompliance with this Division.
1214.2 Building requirements for construction in the 65 dB zone.
1. Exterior Walls.
Walls that farm the exterior envelope may be as listed below and shall be
constructed as follows:
a. Woad walls with studs at least 4 inches in nominal depth. Exterior finish shall
be stucco, minimum 7/8-inch thickness, brick veneer, masonry, or any siding
material allowed by this code. Wood, metal or cementitious fiber siding shall be
installed over 1z-inch solid sheathing.
Wall insulation shall be at least R-13 glass fiber, or mineral wool or equal and
shall be installed continuously throughout the stud space. Foam insulation, as
permitted by this code, shall be accepted provided it solidifies to a spongy state
and not solid or rigid.
Interior wall fmish shall be at least 1/Z" gypsum wallboard
b. Masonry or concrete load bearing walls. Masonry walls with a surface weight of
less than 40 pounds per square foot will require an interior supporting studwall
that is finished as required by Item a above.
c. Or, it is permitted to use any wall designated in Section 1215 with a default STC
value of 25'~ or greatex.
2. Exterior Windows
Windows in the exterior envelope shall be constructed as follows:
a. All openable windows in the exterior walls shall have a laboratory sound
transmission class rating of at least STC 30 dB and shall have air infiltration rate
of no more than 0.5 cubic feet per minute when tested according to ASTM E-
2&3; or, shall be double thermopane windows meeting the requirements of the
Energy Code.
b. .All fixed windows in the exterior walls shall be at least'/-inch thick and shall be
set in non-hardening glazing materials; or, shall be double thermopane windows
meeting the requirements of the Energy Code.
c. Or, it is permitted to use any window designated in Section 1215 with a default
STC value of 25 * or greater.
d. The total area of glazing in rooms used for sleeping shall. not exceed 2p percent
of the floor area.
3. Exterior Doors
a. Exterior hinged doors shall be as follows:
1. a door and edge seal assembly that has a laboxatory sound transmission class
rating of at least STC 30 dB; or
2. a door, other than a hollow core wood door, that complies with the Energy
Code; or,
3. any door installed with a storm door; or,
4. doors installed as part of a vestibule.
b. Sliding glass doors shall have glass that has a laboxatory sound transmission
class ratvag of at least STC 30 dB; or, shall be a sliding glass door that complies
with the Energy Coda.
c. Access doors from a garage to a room within a dwelling shall have a laboratory
sound transmission rating of at least STC 30 dB; or, shall comply with the
Energy Code as a door in the exterior envelope.
d. Or, it is permitted to use any door designated in Section 1215 with a default STC
value of 25 * or greater.
e. View windows in doors and sidelights shall comply with item 2 above, unless
used in a door as listed in 3a above.
4. Roof/Ceiling Constructio~a
a. Roof rafters shall have a minimum slope of 4:12 and shall be covered on their
top surface with %Z-inch solid sheathing and any roof covering allowed by this
code. An accessible attic space shall be provided above rooms on the uppermost
level of Group R buildings.
b. Commercial type flat roofs are permitted if insulated as required by the Energy
Code and a separate lay-in ceiling is added below with an airspace between the
two.
c. Cathedral ceilings are discouraged but, if installed, must have enough space to
install the insulation of Item d below, with a minimum of 6" air space between
the insulation and the roof deck.
d. Attic insulation shall be Batt or blown-in glass fiber or mineral wool with a
minimum R-30 rating applied between the ceiling joists.
e. Attic ventilation, when installed, shall be:
1. Gable vents ar other attic vents that penetrate the attic enclosure shall be
fitted with a %2" plywood panel, with 1" semi-rigid insulation attached to the
surface facing the vent, so that the panel is at least six inches larger than the
vent opening on all sides and is attached to prevent direct line-af--site
perpendicular to the vent. The new panes shall also be positioned so that the
amount of ventilation is not reduced. Or,
2. Eave vents that are located under the roof overhang.
f. Ceilings shall be finished with gypsum board or plaster that is at least 5/8-inch
thick;
or,
%z" gypsum board on resilient channels (RC) installed 16" a.c. perpendicular to
the joists. Gypsum screws into the RC shall not be long enough to penetrate the
wood stud by more than ~/a" if occurring over the stud location;
or,
a lay-in ceiling with an airspace.
g. Skylights shall penetrate the ceiling by means of a completely enclosed light well
that extends from the roof opening to the ceiling opening. A secondary openable
glazing panel shall be mounted at the ceiling line and shall be glazed with at least
3/16-inch plastic, tempered or laminated glass. The weather-side skylight shall
be any type that is permitted by this code. The total size of skylights shall be no
mare than 20 percent of the roof area of the room.
5. Floors
The floox ofthe lowest occupied rooms shall be slab on fill, below grade or aver a
fully enclosed basement or crawlspace. All door and window openings in the fully
enclosed basement shall be tightly fitted. All crawlspace vents must be fitted with a
%z" plywood panel, with 1" semi-rigid insulation attached to the surface facing the
vent, so that the panel is at least six inches larger than the vent opening on all sides
and is attached to prevent direct line-of--site perpendicular to the vent. The new panel
shall also be positioned so that the amount of ventilation is not reduced.
6. Ventilation
a. A ventilation system shall be provided that will provide at least the minimtun air
circulation and fresh air supply requirements of the Mechanical Code, in each
room without opening any windows, door or other opening to the exterior.
Openable windows or doors will not be counted for compliance with the fresh air
provisions. Fresh air must be brought in through the HVAC system.
b. Window and/or through-the-wall ventilation or air-conditioning units shall not be
used.
c. A11 vent ducts connecting the interiox space to the outdoors shall contain at least
a fien-foot length of internal sound-absorbing duct lining. Each. duct shall be
provided with aninety-degree (right angle) bend in the duct such that there is no
direct line-of--sight through the duct from the venting cross-section to the room-
opening cross-section. Residential bathroom vents discharging at an eave vent
need only to have two ninety-degree (right angle) bends.
d. Kitchen cooktop vent hoods shall be the non-ducted recirculating type with no
ducted connection to the exterior.
7. Fireplaces
Each fireplace constructed of masonry units shall be fitted with a spark arrestor, a
damper as required by code and shall have glass doors across the front ofthe firebox.
8. Wall and Ceiling Openings
Openings in the exterior that degrades its ability to achieve an interior rating of 45
dB or less when all doors and windows are closed are prohibited. Any access panels,
pet doors, mail delivery drops, air conditioning, or other openings must be designed
to maintain the 45 dB or Tess standard in the room to which they provide access.
At the penetration of exterior walls by pipes, ducts, or conduits, the space between
the wall and pipes, ducts, or conduits shall be caulked at the pipe duct or conduit or
filled with mortar to the wall.
*STG ratings may overstate the actual attenuation grovided by as much as 3 d13, therefore, 25 STC rating in lien of 20
is mandated.
1.214.3 Building requirements for construction in the 70 d8 zone.
1. Exterior Walls
Walls that form the exterior envelope maybe as listed below and shall be
constructed as follows:
a. Wood walls with studs at least 4 inches in nominal depth. Exterior finish shall
be stucco, minimum 7/$-inch thickness, brick veneer, masonry, or any siding
material allowed by this code. Wood, metal or cementitious fiber siding shall be
installed over z/Z-inch solid sheathing.
Wall insulation shall be at Least R-13 glass fiber, or mineral wool or equal and
shall be installed continuously throughout the stud space. Foam insulation, as
permitted by this code, shall be accepted pxovided it solidifies to a spongy state
and not solid or rigid.
Interior wall finish shall be at least 5/8-inch gypsum wallboard or plaster;
or,
%2" gypsum wallboard installed on resilient channels (R.C) installed 15" o.c.
perpendlcuiar to the studs. Gypsum screws into the RC shall not be Long enough
to penetrate the wood stud by more than'/4" if occurring over the stud location.
b. Masonry or concrete load bearing walls. Masonry walls with a surface weighf of
less than 40 pounds per square foot will require an interior supporting studwall
that is finished as required by Item a above.
c. Or, it is permitted to use any wall designated in Section 1215 with a default STC
value of 30* or greater. When using door/window openings with a default STC
value of less than 30 STC but not less than 25 STC, the STC of the wall shall be
downrated by 20%.
2. Exterior Windows
Windows in the exterior envelope shall be constructed as follows:
a. All openable windows in the exterior walls shall have a laboratory sound
transmission class rating of at least STC 35 dB and shall have air infiltration rate
of no more than 0.5 cubic feet per minute when tested according to ASTM E-
283.
b. All fixed windows in the exterior walls of rooms shall:
1. Have a laboratory sound transmission class rating of at least STC 35 db, or
2. Be 5/8-inch laminated glass with a laboratory sound transmission class rating
of at least STC 35 db and shall beset innon-hardening glazing materials, or
3. Be glass block at least 3-1/2 inches thick.
c. Or, it is permitted to use any window designated in Section 1215 with a default
STC value of 30* or greater.
d. The total area of glazing in,rooms used for sleeping shall not exceed 20 percent
of the floor area.
3. Exterior Doors
a. Exterior hinged doors shall be as follows:
1. a door and edge seal assembly that has a laboratory sound transmission class
rating of at least STC 35 dB; or
2. a door, other than a hollow core wood door, that complies with the Energy
Code and installed with a storm door; or,
3. doors installed as part of a vestibule.
b. Sliding glass doors shall have glass that has a laboratory sound transmission
class rating of at least STC 35 dB.
c. Access doors from a garage to a room within a dwelling shall have a laboratory
sound transmission xating of at least STC 30 dB; or, shall comply with the
Energy Code as a door in the exterior envelope.
d. Or, it is permitted to use any door designated in Section 1215 with a default STC
value of 30* or greater.
e. View windows in doors and sidelights shall comply with item 2 above, unless
used in a door as listed in 3a above.
4. Roof/Ceiling Construction
a. Roof rafters shall have a minimum slope of 4:12 and shall be covered on tb.eir
tap surface with'/2-inch solid sheathing and any roof covering allowed by this
code. An accessible attic space shall be provided above rooms on the uppermost
level of Group R buildings.
b. Commercial type flat roofs are permitted if insulated as required by the Energy
Code and a separate lay-in ceiling is added below with an airspace between the
two.
c. Cathedral ceilings are discouraged but, if installed, must have 3/4" solid decking
above, enough space to install the insulation of Item d below, with a minimum of
6" air space between the insulation and the roof deck.
d. Attic insulation shall be Batt or blown-in glass fiber or mineral wool with a
minimum R-30 rating applied between the ceiling joists.
e. Attic ventilation, when installed, shall be:
1. Gable vents or other attic vents that penetrate the attic enclosure shall be
fittedwith a %2" plywood panel, with 1" semi-rigid insulation attached to the
surface facing the vent, so that the panel is at least six inches larger than the
vent opening on all sides and is attached to prevent direct line-of--site
perpendicular to the vent. The new panel shall also be positioned sa that the
amount of ventilation is not reduced. Or,
2. Eave vents that are located under the roof overhang.
f Ceilings shall be finished with gypsum board ar plaster that is at least 518-inch
thick. Ceiling materials shall be mounted an resilient channels;
or,
a lay-in ceiling with an airspace.
g. Skylights shall penetrate the ceiling by means of a completely enclosed light well
that extends from the roof opening to the ceiling opening. A secondary openable
glazing panel shall be mounted at the ceiling line ar at a point that provides at
least a 4-inch space between the skylight glazing and the secondary glazing and
shall be glazed with at least 3/16-inch plastic ox laminated glass. The weather-
side skylight shall be any type that is permitted by this code. The total size of
skylights shall be na more than 20 percent of the roof area of the roam.
5. Floors
The floor of the lowest occupied rooms shall be slab an fill, below grade or over a
fa11y enclosed basement or crawlspace. All door and window openings in the M.y
enclosed basement shall be tightly fitted. All crawlspace vents must be fitted with a
%z" piywoad panel, with 1" semi-rigid insulation attached to the surface facing the
vent, so that the panel is at least six inches larger than the vent opening an all sides
and is attached to prevent direct line-of=site perpendicular to the vent. The new panel
shall also be positioned so that the amount of ventilation is nit reduced.
6. Ventilation
a. A ventilation system shall be provided that will provide at least the minimum air
circulation and fresh air supply requirements of the Mechanical Code, in each
room without opening any windows, Boar or other opening to the exterior.
Openable windows or doors will not be counted for compliance with the fresh air
provisions. Fresh air must be brought in through the I-IVAC system.
b. Window and/or through-the-wall ventilation ar air-conditioning units shall not be
used.
c. All vent ducts connecting the interior space to the outdoors shall contain at least
a ten-foot length of internal sound-absorbing duct lining. Each duct shall be
provided with aninety-degree (right angle} bend in the duct such that there is no
direct line-of--sight through the duct from the venting cross-section to the room-
opening cross-section. Residential bathroom vents discharging at an eave vent
need only to have two ninety-degree (right angle) bends.
d. Kitchen cooktop vent hoods shall be the non-ducted recirculating type with no
ducted connection to the exterior.
7. Fireplaces
Each fireplace constructed of masonry units shall be fitted with a spark arrestox, a
damper as required by code and shall have glass doors across the front of the firebox.
8. Wall and Ceiling Openings
Openings in the exterior that degrades its ability to achieve an interior rating of 4S
dB or Iess when all doors and windows are closed are prohibited. Any access panels,
pet doors, mail delivery drops, air conditioning, or other openings must be designed
to maintain the 45 dB or less standard in the room to which they provide access.
At the penetration of exterior walls by pipes, ducts, ar conduits, the space between
the wall and pipes, ducts, or conduits shall be caulked at the pipe duct or conduit or
filled with mortar to the wall.
*STC ratings may overstate the actual attenuation provided by as much as 3 dB, therefore, 30 STC rating in lieu of 25
is mandated.
1214.4 Building requirements for construction in the 75 dB ar greater areas.
1. Exterior Walls
Walls that farm the exterior envelope may be as listed below and shall be
constructed as follows:
a. Wood walls with studs at least 4 inches in nominal depth. Exterior finish shall
be stucco, minimum 7/8-inch thickness, brick veneer, masonry, or any siding
material allowed by this code. Wood, metal or cementitious fiber siding shall be
installed over 3/4-inch solid sheathing.
Wall insulation shall be at least R~13 glass fiber, or mineral wool or equal and
shall be installed continuously throughout the stud space. Foam insulation, as
permitted by this code, shall be accepted provided it solidifies to a spongy state
and not solid or rigid.
Interior wall finish shall be at least 5/8-inch gypsum wallboard installed on
resilient channels (RC} installed 16" o.c. perpendicular to the studs. Gypsum
screws into the RC shall not be Long enough to penetrate the wood stud by more
than i/4" if occurring over the stud location.
b. Masonry or concrete Ioad bearing walls. Masonry walls with a surface weight of
less than 40 pounds per square foot will require an interior supporting studwall
that is finished as required by Item a above.
c. Or, it is permitted to use any wall designated in Section 121 S with a default STC
value of 35~` or greater. When using door/window openings with a default STC
value of less than 3S STC but not less than 30 STC, the STC of the wall shall be
downrated by 20%.
2. Exterior Windows
Windows in the exterior envelope shall be constructed as follows:
a. All openable windows in the exterior walls shall have a laboratory sound
transmission class rating of at least STC 40 dB and shall have air infiltration rate
of no more than 0.5 cubic feet per minute when tested according to ASTM E-
283.
b. All fixed windows in the exterior walls of rooms shall:
1. Have a laboratory sound transmission class rating of at least STC 40 db, or
2. Be 5/8-inch laminated glass with a laboratory sound transmission class rating
of at least STC 40 db and shall be set innon-hardening glazing materials, or
3. Be glass block at least 3-1/2 inches thick.
c. Or, it is permitted to use any window designated in Section 1215 with a default
STC value of 35* or greater.
d. The total area of windows and doors in rooms used for sleeping shall not exceed
ZO percent of the floor area.
3. Exterior Doors
a. Exterior hinged doors shall be as follows:
1. a door and edge seal assembly that has a laboratory sound transmission class
rating of at least STC 40 dB; or
2. a solid-core wood or insulated metal door at least one (1) inch tlriclc separated
by an airspace of at least four (4) inches from another door, which can be a
storm door. Both doars shall be tightly fitted and weather-stripped; or,
3. doors installed as part of a vestibule.
b. Sliding glass doors shall have glass that has a laboratory sound transmission
class rating of at least STC 40 dB;
or,
a double sliding glass door, separated by a minimum four-inch airspace. Each
door shall comply with the air leakage rate of the Energy Code. Glass shall be at
least three-sixteenths (3/16) inch thick but not equal in thickness between the two
doors, and tempexed or laminated.
c. Access doars from a garage to a room within a dwelling shall have a laboratory
sound transmission rating of at least STC 30 dB; or, shall comply with the
Energy Code as a door in the exterior envelope.
d. Or, it is permitted to use any door designated in Section 121 S with a default STC
value of 35* or greater.
e. View windows in doors and sidelights shall comply with item 2 above, unless
used in a door as listed in 3a above.
f The joint between the wall opening and the door frame shall be continuously
filled with glass fiber insulation and the exterior cover trim shall be continuously
caulked to seal the j Dint.
4. JKoaf/Ceiling Canstrnction
a. Roof rafters shall have a minimum slope of 4:12 and shall be covered on their
top surface with %Z-inch solid sheathing and any roof covering allowed by this
code. An accessible attic space shall be provided abave rooms on the uppermost
level of Group R buildings.
b. Commercial type flat roofs are permitted if insulated as required by the Energy
Code and a separate lay-in ceiling is added below with an airspace between the
two.
c. Cathedral ceilings are discouraged but, if installed, must have 1" solid decking
abave, have enough space to install the insulation of ltem d below, with a
minimum of 6" air space between the insulation and the roof deck. Stntctural
information shall be provided confirming adequate support of the decking.
d. Attic insulation shall be Batt ar blown-in glass fiber or mineral wool with a
minimum R-30 rating applied between the ceiling joists.
e. Attic ventilation, when installed, shall be:
1. Gable vents or other attic vents that penetrate the attic enclosure shalt be
fitted with a i/Z' plywood panel, with 1" semi-rigid insulation attached to the
surface facing the vent, so that the panel is at least six inches largex than the
vent opening on all sides and is attached to prevent direct line-of--site
perpendicular to the vent. The new panel shall also be positioned so that the
amount of ventilation is not reduced. Or,
2. Eave vents that are located under the roof overhang.
f. Ceilings shall be finished with gypsum board or plaster that is at least 5/8-inch
thick. Ceiling materials shall be mounted on resilient channels;
or,
a lay-in ceiling with an airspace.
g. Skylights shall penetrate the ceiling by means of a completely enclosed light well
that extends from the roof opening to the ceiling opening. A secondary openable
glazing panel shall be mounted at the ceiling line or at a point that provides at
least a flinch space between the skylight glazing and the secondary glazing and
shall be glazed with at least 3/16-inch plastic or laminated glass. The weather-
side skylight shall be any type that is permitted by this code. The total size of
skylights shall be na more than 2Q percent of the roof area of the room.
5. Floors
The floor of the lowest occupied rooms shall be slab on fill, below grade or over a
fully enclosed basement or erawlspace. All door and window openings in the fully
enclosed basement shall be tightly fitted. All crawlspace vents must be fitted with a
%" plywood panel, with 1"semi-rigid insulation attached to the surface facing the
vent, so that the panel is at least six inches larger than the vent opening on all sides
and is attached to prevent direct line-of--site perpendicular to the vent. The new panel
shall also be positioned so that the amount of ventilation is not reduced.
6. Ventilation
a. A ventilation system shall be provided that will provide at least the minimum air
circulation and fresh aix supply requirements of the Mechanical Code, in each
room without opening any windows, door or other opening to the exterior.
Operable windows ar doors will rat be counted for compliance with the fresh air
provisions. Fresh air must be brought in through the HVAC system.
b. Window and/ar through-the-wall ventilation or air-conditioning units shall not be
used.
c. All vent ducts connecting the interior space to the outdoors shall contain at least
a ten-foot length of internal sound-absorbing duct lining. Each duct shall be
provided with aninety-degree (right angle) bend in the duct such that there is no
direct line-of-sight through the duct from the venting cross-section to the room-
opening cross-section. Residential bathroom vents discharging at an eave vent
need only to have two ninety-degree {right angle) bends.
d. Kitchen cooktop vent hoods shall be the non-ducted xecixculating type with no
ducted connection to the exterior.
7. Ffireplaces
Each fireplace constricted of masonry units shall be fitted with a spark arrestor, a
damper as required by code and shall have glass doors across the front of the firebox.
$, Wall and Ceylang Openings
Openings in the exterior that degrades its ability to achieve an interior rating of 45
dB or less when all doors and windows are closed are prohibited. Any access panels,
pet doors, mail delivery drops, air conditioning, or other openings must be designed
to maintain the 45 dB or less standard in the room to which they provide access.
At the penetration of exterior walls by pipes, ducts, or conduits, the space between
the wall and pipes, ducts, or conduits shall be caullced at the pipe duct or conduit or
filled with mortar to the wall.
*STC ratings may overstate the actual attenuation provided by as muoh as 3 dB, therefore, 35 STC rating in lieu of 30
is mandated.
SECTION 1215
DEFAULT COMPONENT RATINGS
1215.1 General. The acoustical performance of the building depends on the combined
performances of each of the elements. The final result depends an the transmission loss (or
STC) and the relative surface areas of the elements. If any of the components has poor
insulation properties the overall performance can be seriously weakened. Windows are
usually one of the weakest elements in the dwelling's sound insulation performance.
The following default STC ratings may be used in determining the sound envelope of the
building. The required combined default values are as follows:
Zone 65 dB -The sound enclosure must be comprised of all components, wall, window,
doors and roof that each have a default STC rating of 25* or higher.
Zone 70 dB -The sound enclosure must be comprised of all components, wall, window,
doors and roof that have a default STC rating of 30'~ or higher. It is permitted to use
windows and doors of less than 30 STC but not less Haan 25 STC rating, provided
the wall STC shall be downrated by 20% and the non-compliant window/door area
shall not exceed 20% of the floor area per room.
Zone 75 or higher dB -The sound enclosure must be comprised of all components, wall,
window, doors and roof that have a default STC rating of 35'~ or higher. It is
permitted to use windows or doors with less than 35 STC but not less than 30 STC
rating, provided the wall STC shall be downrated by 20% and the non-compliant
window/door area shall not exceed 20% of the floor area per room.
`STC ratings may overstate the actual attenuation provided by as much as 3 dB, dxerefore, all STC rating
requirements are upgraded by 5.
STC when
under-rated
Walls STC windows or
doors are used
Exterior siding,'/z" solid sheathing, 2 x 4" nominal stud 16" 39 31
o.c., fiberglass insulation, I/2" interior gypsum attached directly
to studs
7/8" stucco, No. 15 felt building paper and 1"wire mesh, 2 x
4" nominal stud 16" o.e., fiberglass insulation, %z" gypsum 46 37
board attached directly to stud.
pace Brick, l/x" air space with metal ties, 3/a" insulation board
sheathing, 2 x 4" nominal studs 16" o.c., fiberglass building
insulation, l/z" sum board attached directly to studs 56 45
1" stucco, 8" thick hollow concrete block, %z" gypsum attached
to furring strips 49 39
Exteriox siding, 7/16" solid sheathing, 2 x 4" nominal stud 16"
o.c., batt insulation, resilient channels,'/z" gypsum board 43 34
Exterior siding, 7/16" solid sheathing, 2 x 6" nominal stud 16"
a.c., batt insulation, resilient channels,'/z" gypsum board 47 37
Exterior siding, 7/16" solid sheathing, 2 x 4" staggered studs
16" o.e. on 2 x 6" base plate, batt insulation,'/z" gypsum 50 40
attached directly to studs
Windows STC
Wood double hung, closed but unloclced, single glazing 23
Aluminum sliding, latched, single glazing 24
Wood double hung, closed but unlocked, glazed with 7116" insulating
glass
22
1/8" double glazed window with %4" airs ace 26
'/a" single glazed window 30
%a" laminated glass single glazed window 34
%4" + 1/8" double glazed window with 2" airs ace 39
1/4" + 1/8" double glazed window with 4 3/" airs ace 43
Doors STC
Wood, flush solid core, with brass weather stripping 27
Wood, flush solid core, plastic weather stripping, aluminum storm door 34
Woad, French door, brass weather stri ing 26
Steel, flush, with urethane foam core, with magnetic weather stri ing 28
Wood, solid core 26
Steel or fiberglass 25
Sliding glass 27
Figure 1211.1(1)
SECTION 2.
This article shall be cumulative of all provisions of ordinances and of the Code of the
City of Fort Worth, Texas {1986), as amended, except where the provisions of this article
are in direct conflict with the provisions of such ordinances and such Code, in which event
conflicting provisions of such ordinances and such Code are hereby repealed.
SECTION 3.
It shall be unlawful for any person to erect, construct, enlarge, alter, repair, move,
improve, xemove, convert, demolish, equip, use, occupy, or maintain any building ar
structure in the City ox cause the same to be done contrary to or in violation of any of the
provisions of this Code. Any person, firm or corporation violating any of the provisions of
this ordinance shall be deemed guilty of a misdemeanor and upon conviction thereof shall
be punishable by a fine not to exceed Twa Thousand Dollars ($2,000.00) for all violations
involving fire safety, or public health and sanitation and shall be fined not more than Five
Hundred Dollars ($500.00) for all other violations of this ordinance. Each day or any
portion thereof during which any violation of this ordinance occurs or continues shall be
deemed a separate offense and upon conviction thereof shall be punishable as herein
provided.
SECTION 4.
It is hereby declared to be the intention of the City Cauricil that the sections,
paragraphs, sentences, clauses, and phrases of this ordinance are severable, and, if any
phrase, clause, sentence, paragraph, or section of this ordinance shall be declared void,
ineffective, or unconstitutional by the valid judgment ar final decree of any court of
competent jurisdiction, such voidness, ineffectiveness, or unconstitutionality shall not affect
any of the remaining phrases, clauses, sentences, paragraphs, and sections of this ordinance,
since the same would have been enacted by the City Council without the incorporation in
this ordinance of any such void, ineffective, or unconstitutional phrase, clause, sentence,
paragraph, or section.
SECTION 5.
This ordinance constitutes a digest and revision of the Building Code of the City of
Fort Worth, as provided in Section 2, Chapter XXV, and Section 9, Chapter XXVII, of the
Charter of the City of Fort Worth. The Development Department of the City of Fort Worth,
Texas, is hereby authorized to publish this ordinance in pamphlet farm for general
distribution among the public, and the operative provisions of this ordinance, as so
published, shall be admissible in evidence in all courts without further proof than the
production thereof, as provided in Chapter XXV, Section 3, of the Charter of the City of
Fort Worth, Texas.
SECTION 6.
The City Secretary of the City of Fort Worth, is hereby directed to publish the
caption, penalty clause, and effective date of this ordinance for two (2) days in the official
newspaper of the City of Fort Worth, Texas as authorized by Section 2, Chapter XXV of the
Charter of the City of Fart Worth, Texas and by Section 52A13 (a} of the Texas Local
Government Code.
SECTION 7.
This ordinance shall take effect upon adoption and publication as required by law.
`APPROVED AST ORM AND LEGALITY:
Assistant City Attorney
Adopted: August 9, 2007
Effective: ~~
Cod ®f ®r~ ®rth, 7"exas
Mayor anti Council Communication
COUNCIL ACTION: Approved on 8/9/2007 -Ord. Nos. 17680-0$-2007 and 17681-08-2007
DATE: Thursday, August 09, 2007
LOG NAME: 06AIRPORT NOISE REFERENCE NO.: PZ-2747
SUBJECT:
Adopt Ordinances Amending the Building Code and Residential Code to Add Noise Attenuation
Provisions for Noise-Sensitive Uses in the Naval Air Station Joint Reserve Base Noise Impact Areas
RECOMMENDATION:
It is recommended that the City Council adopt the attached ordinances amending the Building Code and the
Residential Code by adding construction provisions for attenuation of airport noise for certain uses in the
Naval Air Station Joint Reserve Base noise impact areas.
DISCUSSION:
The City of Fort Worth, other adjacent municipalities, and Tarrant County are participating in a Joint Land
Use Study (JLUS) associated with the Naval Air Station Joint Reserve Base. The purpose of the JLUS is to
promote compatible community growth that supports military training and operational missions at the Joint
Reserve Base. A JLUS Policy Committee is overseeing the study and will issue recommendations in
October 2007. The recommendations will seek to minimize incompatible development in the noise impact
areas, which are depicted in the attached ordinances. Each municipality will then review the
recommendations and revise their development regulations on an individual basis.
Given the potential for incompatible development while the study recommendations are prepared and
implemented, the City Council authorized staff to prepare building code amendments for noise sensitive
uses in the noise impact areas. These uses include residences, nursing homes, hospitals, day care centers,
and schools. The code amendments would require noise attenuation in the construction of new buildings to
achieve an interior noise level of 45 DNL. The requirements will apply to exterior walls, exterior windows,
exterior doors, roof/ceiling construction, wall and ceiling openings, floors, ventilation and fireplaces. The
attached ordinances would amend the Building Code and the Residential Code.
In June and July, City staff briefed affected property owners, the Development Advisory Committee, and
representatives of the Fort Worth Builders Association, Greater Fort Worth Association of Realtors, and the
Fort Worth Chamber of Commerce. The City Council endorsed the proposed code amendments at the pre-
Council meeting on July 31.
The ordinance amendments would affect property in COUNCIL DISTRICTS 3 and 7.
FISCAL INFORMATION/CERTIFICATION:
The Finance Director certifies that this action will have no material effect on City funds.
Logname: 06AIRPORT NOISE Page 1 of 2
TO Fund/Account/Centers
FROM Fund/Account/Centers
Submitted for City Manager's Office by: Dale Fisseler (6266)
Originating Department Head: Fernando Costa (8042)
Additional Information Contact: AI Godwin (7825)
Logname: 06AIRPORT NOISE Page 2 of 2