HomeMy WebLinkAboutOrd 2002-22 Adopt Int Mechinical Code W Amend.pdfCITY OF ANNA, TEXAS
ORDINANCE NO. 2002-22
AN ORDINANCE OF THE CITY OF ANNA, TEXAS, ADOPTING THE 2000
EDITION OF THE INTERNATIONAL MECHANICAL CODE; ADOPTING THE
NORTH CENTRAL TEXAS COUNCIL OF GOVERNMENTS RECOMMENDED
AMENDMENTS; ADOPTING A SCHEDULE OF FEES; AUTHORIZING THE
MAYOR OR HIS AUTHORIZED REPRESENTATIVE TO ENFORCE THE
PROVISIONS OF THE INTERNATIONAL MECHANICAL CODE; PROVIDING
A REPEALER CLAUSE; PROVIDING A SAVINGS CLAUSE; AND PROVIDING
FOR AN EFFECTIVE DATE
WHEREAS, the City's existing building codes have been determined to be in serious need of
updating; and
WHEREAS, the state had mandated that the International Codes or comparable regulations are
to be used if the Citv intends to reaulate building construction: and
WHEREAS, the other cities in the North Central Texas area have adopted or intend to adopt the
International Codes and the city council desires that the City of Anna should have building
standards comparable to other cities in the area; now therefore
BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF ANNA, TEXAS:
Section 1. International Mechanical Code adopted; amendments; permit fees.
The city council hereby adopts the 2000 Edition of the International Mechanical Code. Copies
of the code and the amendments thereto, as referenced herein, are on file in the office of the
city secretary for permanent record and inspection. The chief building official or his authorized
representative is hereby authorized and directed to enforce all provisions of the International
Mechanical Code, as adopted herein and as amended.
Section 2. Amendments.
The city council hereby adopts the North Central Texas Council of Governments Recommended
Amendments, which are attached to this ordinance as Attachment A.
Section 3. Inspection and service fees.
The schedule of fees for various inspection and other services performed by the code
enforcement official, as detailed in Attachment B, shall be paid to the city before any permit is
issued.
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Section 4. Repeal Clause
All parts of any ordinance in conflict with the provisions of this ordinance are to the extent of
such conflict hereby repealed.
Section 5. Savings Clause
If any provision of this ordinance shall be held to be invalid or unconstitutional, the remainder
of such ordinance shall continue in full force and effect the same as if such invalid or
unconstitutional provision had never been a part hereof.
Section 6. Effective Date
This ordinance shall be effective upon the posting and/or publication of its caption as required
by law and the City Secretary is hereby directed to implement such posting and/or publication.
PASSED by the City Council of the City of Anna, Texas, this 13th day of August, 2002.
APPROVED:
Mayor
ATTESTED:
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ATTACHMENT A
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Recommended Amendments to the
2000 International Mechanical Code
North Central Texas Council of Governments region
**Section 102.8; change to read as follows:
102.8 Referenced codes and standards. The codes and standards referenced herein shall be those
that are listed in Chapter 15 and such codes, when specifically adopted, and standards shall be
considered part of the requirements of this code to the prescribed extent of each such reference. Where
differences occur between provisions of this code and the referenced standards, the provisions of this
code shall apply. Whenever amendments have been adopted to the referenced codes and standards,
each reference to said code and standard shall be considered to reference the amendments as well Anv
reference to NFPA 70 or the ICC Electrical Code shall mean the Electrical Code as adopted
(Reason: Legal wording to recognize locally adopted codes and amendments adopted with referenced
codes.)
**Section 302.3, change to read as follows:
302.3 Cutting, notching and boring in wood framing. When permitted by the International Building
Code. the The cutting, notching and boring of wood framing members shall comply with Sections 302.3.1
through 302.3.3.
(Reason: Reference IBC and its restrictions. Consistent with regional amendment to IFGC 302.3.)
"Section 304.5; delete.
(Reason: This provision does not reflect standard practice in this area. Consistent with regional
amendment to IFGC 305.4.)
**Section 304.8, change to read as follows:
304.8 Clearances from grade. Equipment and appliances installed at grade level shall be supported on
a level concrete slab or other approved material extending above adjoining grade a minimum of 3 inches
76 mm or shall be suspended a minimum of 6 inches (152 mm) above adjoining grade.
(Reason: Consistent with current local practice. Consistent with regional amendment to IFGC 305.5.)
**Add Section 304.11 to read as follows:
304.11 Minimum burial depth. Underground fuel piping systems shall be installed a minimum depth of
18 inches (458 mm) below grade.
(Reason: To provide increased protection to piping systems. Consistent with recommended amendments
to IFGC Section 404.9 and IRC Section M1304.2.)
North Central Texas 1 February 2001
2000 IMC amendments
"Section 306.3; change to read as follows:
306.3 Appliances in attics. Attics containing appliances requiring access shall be provided ... (bulk of
paragraph unchanged) ... side of the appliance. The clear access opening dimensions shall be a
minimum of 20 inches by 30 inches (508 mm by 762 mm), or larger where such dimensions are not large
enough to allow removal of the largest appliance. As a minimum, access to the attic space of residential
uses shall be provided by one of the following:
1. A permanent stair.
2. A pull down stair.
3. An access door from an upper floor level.
Exception: The passageway and level service space are not required where the appliance is
capable of being serviced and removed through the required opening.
(Reason: To provide a safe means of accessibility to appliances in attics. Consistent with regional
amendment to IFGC 306.3.)
'Section 306.3.1; add a sentence to read as follows:
Low voltage wirinq of 50 Volts or less shall be installed in a manner to prevent phvsical damage
(Reason: To call attention to the need for care while installing lighting wiring in attic. Consistent with IFGC
amendments.)
"Section 306.4.1; add a sentence to read as follows:
Low voltage wiring of 50 Volts or less shall be installed in a manner to prevent phvsical damage.
(Reason: To call attention to the need for care while installing lighting wiring under floors. Consistent with
IFGC amendments.)
'Section 306.5; change to read as follows:
306.5 Equipment and appliances on roofs or elevated structures. Where equipment and appliances
requiring access are installed on roofs or elevated structures at a height exceeding 16 feet (4877 mm),
such access shall be provided by a permanent approved means of access_, the e)deAt of which -hpl, be
frem Permanent exterior ladders providing roof access need not extend closer than 8 feet (2438 mm) to
the finish grade or floor level below and shall extend to the equipment and appliance's level service space
Such access shall ... (bulk of section to read the same}... on roofs having a slope greater than 4 units
vertical in 12 units horizontal (33 -percent slope).
(Reason: To assure safe access to roof appliances. To provide access to electricity for maintenance of
equipment. Consistent with IFGC amendments.)
North Central Texas 2 February 2001
2000 IMC amendments
"Section 306.6; add a second paragraph to read as follows:
(Reason: To provide access to electricity for maintenance of equipment. Consistent with IFGC
amendments.)
Add Section 306.6.1 to read as follows:
306.6.1 Catwalk. On roofs having slopes greater than 4 units vertical in 12 units horizontal a catwalk at
least 16 inches in width with substantial cleats spaced not more than 16 inches apart shall be provided
from the roof access to the working platform at the appliance.
(Reason: To assure safe access to roof appliances. Consistent with IFGC amendments.)
"Add Section 306.7 to read as follows:
(Reason: To provide safe access to water heaters and to provide lighting and receptacle for maintenance
of equipment. Consistent with regional amendments to IFGC 306.7 and IPC 502.7.)
"Section 307.2.1; modify second sentence to read as follows:
307.2.1 Condensate disposal. Condensate from all cooling coils and evaporators shall be conveyed
from the drain pan outlet to an approved place of disposal. Condensate shall not discharge in a publicly
exposed area such as into a street, alley. sidewalk or other areas so as to cause a nuisance.
(Reason: Greater specificity in prohibited locations for condensate discharge. Consistent with regional
amendment to IPC 314.2.1.)
North Central Texas 3 February 2001
2000 IMC amendments
"Section 307.2.2; add a second paragraph to read as follows:
Condensate waste pipes from air-cooling coils may be sized in accordance with equipment
capacity as follows:
Equipment Capacity
in tons of refrigeration
Up to 20 tons
Over 20 to 40 tons
Over 40 to 90 tons
Over 90 to 125 tons
Over 125 to 250 tons
Minimum Condensate Pipe
Inside Diameter
3/4 inch
1 inch
1 1/4 inch
1 % inch
2 inch
(Reason: To provide guidance and increase uniformity in condensate waste pipe sizing. Consistent with
regional amendment to IPC 314.2.2.)
'Section 307.2.3; add item #4 to read as follows:
4. Discharge, as noted, shall be to a conspicuous point of disposal to alert occupants in the event of a
stoppage of the drain. However, the conspicuous point shall not create a hazard such as Mooing over
a walking surface or other areas so as to create a nuisance.
(Reason: To alert occupants to a condition needing corrective action. Consistent with regional amendment
to IPC 314.2.3.)
"Section 401.5; add a second exception to read as follows:
Exceptions:
1_ {existing exception unchanged}
2. Toilet room exhaust ducts may terminate in a warehouse or shop area when infiltration of
outside air is present.
(Reason: Provide a more reasonable alternative in areas where a large volume of outside air is present.)
"Section 403.2; add an exception to read as follows:
Exception: Where the design professional demonstrates that an engineered ventilation system is
designed in accordance with ASHRAE 62 the minimum required rate of outdoor air shall be
permitted to be as specified in such engineered system design
(Reason: Recognize the most commonly used standard as an alternate design method.)
North Central Texas 4 February 2001
2000 IMC amendments
"`Section 403.2.1; add an item #4 to read as follows:
(Reason: Consistent with common local practice. Consistent with regional amendment to IRC R303.3.)
"Table 403.3, footnote g: change to read as follows:
g. Transfer air permitted in accordance with Section 403.2.2.
(Reason: Consistent with common local practice.)
"Section 501.3; add a second exception to read as follows:
Exceptions:
1, {existing exception unchanged}
2. Toilet room exhaust ducts may terminate in a warehouse or shoo area when infiltration of
outside air is present.
(Reason: Provide a more reasonable alternative in areas where a large volume of outside air is present.)
"*Section 504.6; add a sentence to read as follows:
The size of duct shall not be reduced along its developed length nor at the point of termination
(Reason: To clarify size requirement. Consistent with regional amendment to IFGC 613.6.)
"Section 504.6.1; change to read as follows:
504.6.1 Maximum length. The maximum length of a clothes dryer exhaust duct shall not exceed 25 feet
(7620 mm) from the dryer location to the outlet terminal with not more than two bends. When extra bends
are installed, the maximum length of the duct shall be reduced 2.5 feet (762 mm) for each 45 -degree
(0.79 rad) bend and 5 feet (1524 mm) for each 90 -degree (1.6 rad) bend that occur after the first two
bends, measuring in the direction of airflow.
{Exception is unchanged}
(Reason: To make more consistent with regional practice. Dryer technology has improved to the point
where they should be capable of handling this. Consistent with regional amendment to IFGC 613.6.1.)
North Central Texas 5 February 2001
2000 IMC amendments
"Section 506.3.11; change to read as follows:
506.3.11 Duct enclosure. A grease duct serving a Type I hood that penetrates a ceiling, wall or floor
shall be enclosed ...{bulk of paragraph unchanged)... through the use of weather -protected openings.
The enclosure shall be separated from the duct by a minimum of 6 3 inches (352 76 mm) and a maximum
of 12 inches (305 mm) and shall serve a single grease exhaust duct system.
{Exceptions remain unchanged.)
(Reason: Consistent with common local practice.)
**Section 510.7; add a second exception to read as follows:
Exceptions:
7 (existing exception unchanged)
2. Ducts where the larqest cross-sectional diameter of the duct is less than 10 inches (254 mm)
(Reason: Recognize an exception in IFC 903.2.14.1.)
**Section 604.1; change to read as follows:
604.1 General. Duct insulation shall conform to the requirements of Sections 604.2 through 604.1, Table
604.1 and the International Energy Conservation Code. Should there be any conflicts between this
section and the energy code, the energy code shall take orecedence.
(Reason: Reference to Table 604.1 is needed when adopted with these amendments. To clarify which
code governs content of this section.)
**Add Table No. 604.1 to read as follows:
Table 604.1 - Insulation of Ducts
North Central Texas 6 February 2001
2000 IMC amendments
Insulation Types
Insulation
Duct Location
Mechanically
Heating Zone
Types
Cooled
Heating Only
I
A and W
On roof on exterior of building
C, Vz and W
II
B and W
III
C and W
I
A
Attics, garages and crawl spaces
A and VZ
II
A
III
B
In walls', within floor -ceiling spaces'
A and VZ
I
II
A
A
III
B
Within the conditioned space or in
None required
None required
Basements; return ducts in air plenums
Cement slab or within ground
None required
None required
North Central Texas 6 February 2001
2000 IMC amendments
Note: Where ducts are used for both heating and cooling, the minimum insulation shall be as required for
the most restrictive condition.
Heating Degree Days:
Zone I below 4,500 D. D.
Zone II 4,501 to 8,000 D.D.
Zone III over 8,000 D. D.
2 Vapor retarders shall be installed on supply ducts in spaces vented to the outside in geographic areas
where the summer dew point temperature based on the 2 %: percent column of dry-bulb and mean
coincident wet -bulb temperature exceeds 60° F. (15.4° C).
3 Insulation may be omitted on that portion of a duct which is located within a wall- or a floor -ceiling space
where:
3.1 Both sides of the space are exposed to conditioned air.
32 The space is not ventilated.
3.3 The space is not used as a return plenum.
3.4 The space is not exposed to unconditioned air.
Ceilings which form plenums need not be insulated.
INSULATION TYPES4 :
A -- A material with an installed conductance of 0.48 [2.72 W/(m*K)] or the equivalent thermal
resistance of 2.1 [0.367 (m*K)/W].
Example of materials capable of meeting the above requirements:
1 -inch (25 mm), 0.60 Ib./cu.ft. (9.6 kg/m ) mineral fiber, rock, slag or glass blankets.
/-inch (13 mm), 1.5 to 3 Ib./cu.ft. (24 to 48 kg/m3) mineral fiber blanket duct liner.
%:-inch (13 mm), 3 to 10 Ib./cu.ft. (48 to 160 kg/m3) mineral fiber board.
B -- A material with an installed conductance of 0.24 [1.36 W/(m*K)] or the equivalent thermal
resistance of 4.2 [0.735 (m*K)/W].
Example of materials capable of meeting the above requirements:
2 -inch (51 mm), 0.60 Ib./cu.ft. (9.6 kg/m ) mineral fiber blankets.
1 -inch (25 mm), 1.5 to 3 Ib./cu.ft. (24 to 48 kg/m3) mineral fiber blanket duct liner.
1 -inch (25 mm), 3 to 10 Ib./cu.ft. (48 to 160 kg/m3) mineral fiber board.
C -- A material with an installed conductance of 0.16 [0.9 W/(m*K)] or the equivalent thermal
resistance of 6.3 [1.1 (m*K)/W].
Example of materials capable of meeting the above requirements:
3 -inch (76 mm), 0.60 Ib./cu.ft. (9.6 kg/m ) mineral fiber blankets.
1 ''/rinch (38 mm), 1.5 to 3 Ib./cu.ft. (24 to 48 kg/m3) mineral fiber blanket duct liner.
1 '/rinch (38 mm), 3 to 10 Ib./cu.ft. (48 to 160 kg/m) mineral fiber board.
V —Vapor Retarders: Material with a perm rating not exceeding 0.05 perm [29 ng/Pa*s*m2]. All joints
to be sealed.
W -Approved weatherproof barrier.
4 The example of materials listed under each type is not meant to limit other available thickness and
density combinations with the equivalent installed conductance or resistance based on the insulation
only.
(Reason: To reduce heating and/or cooling energy duct losses.)
North Central Texas 7 February 2001
2000 IMC amendments
"Section 604.11; change to read as follows:
604.11 Vapor retarders. Where ducts used for cooling are externally insulated, the insulation shall be
covered with a vapor retarder in accordance with Table 604.1 having a maximum perFneanGe of 0.05
[2 87 ....uo. 2
pe..,,,m iz�..��-�)} or aluminum foil having a minimum thickness of 2 mils (0.051 mm).
Insulations having a permeance of 0.05 perms [2.87 ng/(Pa s ' m2)] or less shall not be required to be
covered. All joints and seams shall be sealed to maintain the continuity of the vapor retarder.
(Reason: Match Table 604.1 amendment.)
"Section 607.2.2; change to read as follows:
607.2.2 Hazardous exhaust ducts. Hazardous exhaust duct systems shall extend directly to the exterio
of the building and shall not extend into or through ducts and plenums Penetration of structural elements
shall conform to this section and the International Building Code except that fire Fire dampers are not
required at penetration of fire -resistance -rated assemblies
GOMPly With SeGti9R 5449.
(Reason: To clarify requirements.)
'Section 607.5.1; change to read as follows:
607.5.1 Fire Walls. Ducts and transfer openings permitted in fire walls in accordance with Section
shall not penetrate fire walls.
(Reason: Correspond with unamended IBC 715.5.1.)
"Section 607.6.1; change to read as follows:
607.6.1 Through penetrations. In occupancies other than Groups 1-2 and 1-3 penetrations by an air
duct through a fire -resistive -rated floor/ceiling assembly that connects not more than two stories are
permitted without shaft enclosure protection where a fire damper is installed at the floor line.
(Reason: To match wording in unamended IBC 715.6.1.)
"Chapter 14; delete.
(Reason: Solar systems can be adequately installed per manufacturer's instructions. Residential solar
systems are addressed in IRC Chapter 23.)
END
North Central Texas 8 February 2001
2000 IMC amendments
MECHANICAL CODE
ATTACHMENT B
The schedule of fees for the various permits is as follows:
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