 |
San Antonio |
 |
Code of Ordinances |
|
Chapter 10. BUILDING-RELATED CODES |
|
Article X. ENERGY CONSERVATION CODE |
§ 10-92. Amendments to the adopted chapters of the International Energy Conservation Code (2018).
Additions to the International Energy Conservation Code(IECC) are shown as underlined text. Deletions of the IECC are shown as bracketed [ strikethroughs ].
Section C402.3, Roof solar reflectance and thermal emittance, is amended to read as follows (exceptions are unchanged):
C402.3 Roof solar reflectance and thermal emittance. Low-sloped roofs , with a slope less than or equal to 2 units vertical per 12 units horizontal, directly above cooled conditioned spaces in Climate Zones 1, 2 and 3 shall comply with one or more of the options in Table C402.3. Roof surfaces with a slope greater than 2 units vertical per 12 units horizontal, directly above cooled conditioned spaces shall have a minimum reflectance of 0.35 or a minimum Solar Reflective Index of 29.
Section C402.4.2, Minimum skylight fenestration area, Exception is amended by adding a sixth exception as follows. All other language in Section C402.4.2 remains:
Exception: Skylights above daylight zones of enclosed spaces are not required in:
1.
Buildings in Climate Zones 6 through 8.
2.
Spaces where the designed general lighting power densities are less than 0.5 W/ft (5.4 W/m ).
3.
Areas where it is documented that existing structures or natural objects block direct beam sunlight on not less than half of the roof over the enclosed area for more than 1,500 daytime hours per year between 8 a.m. and 4 p.m.
4.
Spaces where the daylight zone under rooftop monitors is greater than 50 percent of the enclosed space floor area.
5.
Spaces where the total area minus the area of sidelight daylight zones is less than 2,500 square feet (232 m ), and where the lighting is controlled in accordance with Section C405.2.3.
6.
In warehouses protected by Early Suppression Fast Response (ESFR) fire sprinklers where vertical wall fenestration is provided with a minimum areas equal to that determined by Section C402.4.2.
Section C404.6.1, Circulation systems, is amended to read as follows:
C404.6.1 Circulation systems. Heated-water circulation systems shall be provided with a circulation pump. The system return pipe shall be a dedicated return pipe or a cold water supply pipe. Gravity and thermo-syphon circulation systems shall be prohibited. Controls for circulating hot water system pumps shall comply with one of the following:
1.
Controls for circulating hot water system pumps shall start the pump based on the identification of a demand for hot water within the occupancy. The controls shall automatically turn off the pump when the water in the circulation loop is at the desired temperature and when there is not a demand for hot water.
2.
Controls for circulating hot water system pumps shall include a timer clock switch operating pumps based on time of day/night. Controls shall also include a return water temperature sensor switch to pause the re-circulating pump whenever the return water is hot.
Section C405.5, Dwelling electrical meter (Mandatory), is modified to read as follows:
C405.5 Dwelling electrical meter (Mandatory ). Each dwelling unit located in a Group R-2 multi-family building shall have a separate electrical meter.
Section C501.6, Historic buildings, is amended to read as follows:
C501.6 Historic buildings. Provisions of this code relating to the construction, repair, alteration , restoration and movement of structures, and change of occupancy shall not be mandatory for historic buildings . [ provided a report has been submitted to the code official and signed by a registered design professional or a representative of the State Historic Preservation Office or the historic preservation authority having jurisdiction, demonstrating that compliance with that provision would threaten, degrade or destroy the historic form, fabric or function of the building. ]
Section C503.3.1, Roof replacement, is amended to read as follows:
C503.3.1 Roof replacement. Roof replacements shall comply with Section C402.1.3, C402.1.4, C402.1.5 or C407 where the existing roof assembly is part of the building thermal envelope and contains insulation entirely above the roof deck. New skylights are not required to be provided as part of a roof replacement where the existing building did not have skylights. Where new skylights are installed at the option of the owner as part of the roof replacement, they shall meet Section C503.3.3.
Section R402.4.1.1, Installation, is amended to read as follows:
R402.4.1.1 Installation. The components of the building thermal envelope as listed in Table R402.4.1.1 shall be installed in accordance with the manufacturer's instructions and the criteria indicated in Table R402.4.1.1, as applicable to the method of construction. [ Where required by the code official, an ] An approved third party shall inspect all components and verify compliance. Insulation letters shall not be submitted to the Building Official prior to the inspection being performed and shall be submitted on a form approved by the Building Official.
Section R402.4.1.2, Testing, is amended by amending the first paragraph to read as follows. All other language in Section R402.4.1.2 remains:
R402.4.1.2 Testing. The building or dwelling unit shall be tested and verified as having an air leakage rate not exceeding five air changes per hour in Climate Zones 1 and 2, and three air changes per hour in Climate Zones 3 through 8. Testing shall be conducted in accordance with RESNET/ICC 380, ASTM E 779 or ASTM E 1827 and reported at a pressure of 0.2 inch w.g. (50 Pascals). [ Where required by the code official, testing ] Testing shall be conducted by an approved third party. A written report of the results of the test shall be signed by the party conducting the test and provided to the Building Official [ code official ]. Testing shall be performed at any time after creation of all penetrations of the building thermal envelope .
Section R402.6, Radiant Barrier, is added to read as follows:
R402.6 Radiant Barrier. In new dwellings, a roof radiant barrier with an emittance of 0.10 or less as tested in accordance with ASTM C-1371 or ASTM E-408 is required above conditioned spaces. The radiant barrier shall be installed according to the manufacturer's instructions.
Exceptions:
1.
Roofs covered with materials that have a solar reflectance of 0.4 or greater.
2.
Residential buildings with sealed attics such as foam type insulation or similar.
3.
Residential buildings with all mechanical equipment and all ductwork located wholly within the conditioned space.
R403.3.1, Insulation (Prescriptive), is amended by adding a second exception as follows.
R403.3.1 Insulation (Prescriptive). Supply and return ducts in attics shall be insulated to an R -value of not less than R-8 for ducts 3 inches (76 mm) in diameter and larger and not less than R-6 for ducts smaller than 3 inches (76 mm) in diameter. Supply and return ducts in other portions of the building shall be insulated to not less than R-6 for ducts 3 inches (76 mm) in diameter and not less than R-4.2 for ducts smaller than 3 inches (76 mm) in diameter.
Exception s :
1.
Ducts or portions thereof located completely inside the building thermal envelope .
2.
Supply and return ducts in attics shall be insulated to an R-value of not less than R-6 for ducts 3 inches (76 mm) in diameter and larger, where the seasonal energy efficiency ratio (SEER) of the installed cooling equipment is higher than the minimum required by federal law for climate zone 2.
Section R403.5.1.1, Circulation systems, is amended to read as follows:
R403.5.1.1 Circulation systems. Heated water circulation systems shall be provided with a circulation pump. The system return pipe shall be a dedicated return pipe or a cold water supply pipe. Gravity and thermo-syphon circulation systems shall be prohibited. Controls for circulating hot water system pumps shall comply with one of the following :
1.
Controls for circulating hot water system pumps shall start the pump based on the identification of a demand for hot water within the occupancy. The controls shall automatically turn off the pump when the water in the circulation loop is at the desired temperature and when there is no demand for hot water.
2.
Controls for circulating hot water system pumps shall include a timer clock switch operating pumps based on time of day/night. Controls shall also include a return water temperature sensor switch to pause the re-circulating pump whenever the return water is hot.
Section R404.1, Lighting equipment (Mandatory), is amended to read as follows:
R404.1 Lighting equipment (Mandatory). Not less than 75 [ 90 ] percent of the permanently installed lighting fixtures shall contain only high-efficacy lamps. Starting 18 months after adoption of this code, not less than 90 percent of the permanently installed lighting fixtures shall contain only high-efficacy lamps.
Table R406.4, Maximum energy Rating Index, is amended as follows:
TABLE R406.4
MAXIMUM ENERGY RATING INDEX
Sections R501.6, Historic buildings, is amended to read as follows:
R501.6 Historic buildings. Provisions of this code relating to the construction, repair, alteration , restoration and movement of structures, and change of occupancy shall not be mandatory for historic buildings . [ provided that a report has been submitted to the code official and signed by the owner, a registered design professional, or a representative of the State Historic Preservation Office or the historic preservation authority having jurisdiction, demonstrating that compliance with that provision would threaten, degrade or destroy the historic form, fabric or function of the building. ]
(Ord. No. 2018-06-21-0493 , § 1, 6-21-18)