Heads up: There are no amended sections in this chapter.
This chapter governs the design and construction of buildings for energy efficiency.
Buildings shall be designed and constructed in accordance with the International Energy Conservation Code.
The following changes shall be made to the IECC:
- Add Exception 3 to Section C402.4.5.2 to read:
- 3. Any grease duct serving a Type I hood installed in accordance with IMC Section 506.3 shall not be required to have a motorized or gravity damper.
- Change Section C402.4.8 to read:
C402.4.8 Recessed lighting. Recessed luminaires installed in the building thermal envelope shall be sealed to limit air leakage between conditioned and unconditioned spaces. All recessed luminaires shall be IC-rated and labeled as having an air leakage rate or not more 2.0 cfm (0.944 L/s) when tested in accordance with ASTM E 283 at a 1.57 psf (75 Pa) pressure differential. All recessed luminaires installed in the thermal envelope shall be sealed with a gasket or caulk between the housing and interior wall or ceiling covering.
- Add Exception 4 to Section C403.2.4.4 to read:
- 4. Any grease duct serving a Type I hood installed in accordance with IMC Section 506.3 shall not be required to have a motorized or gravity damper.
- Change the exception to Section C405.1 to read:
Exception: Dwelling units within commercial buildings shall not be required to comply with Sections C405.2 through C405.5, provided that not less than 75 percent of the permanently installed luminaires, other than low-voltage lighting, shall be fitted for, and contain only, high-efficacy lamps.
- Change Section C405.6 to read:
C405.6 Exterior lighting (Mandatory) . All exterior lighting, other than low-voltage landscape lighting, shall comply with Sections C405.6.1 and C405.6.2.Exception: Where approved because of historical, safety, signage, or emergency considerations.
- Delete Section R401.3.
- Change the ceiling R-value and wood frame wall R-value categories for climate zone "4 except Marine" in Table R402.1.1 to read:
CEILING R-VALUE WOOD FRAME WALL R-VALUE 38 15 or 13 + 1h
- Change the ceiling U-factor and frame wall U-factor categories for climate zone "4 except Marine" in Table R402.1.3 to read:
CEILING U-FACTOR FRAME WALL U-FACTOR 0.030 0.079
- Change Sections R402.2.1 and R402.2.4 to read:
R402.2.1 Ceilings with attic spaces. When Section R402.1.1 would require R-38 in the ceiling, installing R-30 over 100 percent of the ceiling area shall be deemed to satisfy the requirement for R-38 wherever the full height of uncompressed R-30 insulation extends over the wall top plate at the eaves. Similarly, when Section R402.1.1 would require R-49 in the ceiling, installing R-38 over 100 percent of the ceiling area shall be deemed to satisfy the requirement for R-49 wherever the full height of uncompressed R-38 insulation extends over the wall top plate at the eaves. This reduction shall not apply to the U-factor alternative approach in Section R402.1.3 and the total UA alternative in Section R402.1.4.
R402.2.4 Access hatches and doors. Access doors from conditioned spaces to unconditioned spaces (e.g., attics and crawl spaces) shall be weatherstripped and insulated in accordance with the following values:
- Hinged vertical doors shall have a minimum overall R-5 insulation value;
- Hatches and scuttle hole covers shall be insulated to a level equivalent to the insulation on the surrounding surfaces; and
- Pull down stairs shall have a minimum of 75 percent of the panel area having R-5 rigid insulation.
- Delete Section R402.3.6 and change Sections R402.4 and R402.4.1.1 to read:
R402.4 Air leakage. The building thermal envelope shall be constructed to limit air leakage in accordance with the requirements of Sections R402.4.1 through R402.4.4.
R402.4.1.1 Installation (Mandatory). 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 listed in Table R402.4.1.1, as applicable to the method of construction. Where required by the code official, an approved third party shall inspect all components and verify compliance.
- Change the title of the "Criteria" category of Table R402.4.1.1; change the "Walls," "Shower/tub on exterior wall" and "Fireplace" categories of Table R402.4.1.1, and add footnotes "b" and "c" to Table R402.4.1.1 to read:
COMPONENT CRITERIAa,b Walls Cavities within corners and headersshall be insulated by completely fillingthe cavity with a material having aminimum thermal resistance of R-3 per inch.sill plate shall be sealed.
of exterior walls shall be sealed.
for framed walls shall be installed insubstantial contact and continuousalignment with the air barrier.Knee walls shall be sealed.
Shower/tubon exteriorwallc Exterior walls adjacent to showersand tubs shall be insulated, and an airbarrier shall be installed on the interiorside of the exterior wall, adjacentto the shower or tub. Fireplace An air barrier shall be installed onfireplace walls. Fireplaces shall havegasketed doors or tight-fitting fluedampers.
- b. Structural integrity of headers shall be in accordance with the applicable building code.
- c. Air barriers used behind showers and tubs on exterior walls shall be of a permeable material that does not cause the entrapment of moisture in the stud cavity.
- Change Section R402.4.1.2 and add Sections R402.4.1.2.1, R402.4.1.2.2 and R402.4.1.3 to read:
R402.4.1.2 Air sealing. Building envelope air tightness shall be demonstrated to comply with either Section R402.4.1.2.1 or R402.4.1.2.2.
R402.4.1.2.1 Testing option. The building or dwelling unit shall be tested for air leakage. Testing shall be conducted with a blower door at a pressure of 0.2 inches w.g. (50 Pascals). Where required by the building official, 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. Testing shall be performed at any time after creation of all penetrations of the building thermal envelope.
- Exterior windows and doors and fireplace and stove doors shall be closed, but not sealed beyond the intended weatherstripping or other infiltration control measures;
- Dampers, including exhaust, intake, makeup air, backdraft and flue dampers, shall be closed, but not sealed beyond intended infiltration control measures;
- Interior doors, if installed at the time of the test, shall be open;
- Exterior doors for continuous ventilation systems and heat recovery ventilators shall be closed and sealed;
- Heating and cooling systems, if installed at the time of the test, shall be turned off; and
- Supply and return registers, if installed at the time of the test, shall be fully open.
R402.4.1.3 Leakage rate (Prescriptive). The building or dwelling unit shall have an air leakage rate not exceeding 5 changes per hour as verified in accordance with Section R402.4.1.2.
- Change Section R403.1.1 to read:
R403.1.1 Programmable thermostat. The thermostat controlling the primary heating or cooling system of the dwelling unit shall be capable of controlling the heating and cooling system on a daily schedule to maintain different temperature set points at different times of the day. This thermostat shall include the capability to set back or temporarily operate the system to maintain zone temperatures down to 55°F (13°C) or up to 85°F (29°C). The thermostat shall initially be programmed with a heating temperature set point no higher than 70°F (21°C) and a cooling temperature set point no lower than 78°F (26°C).
- Change Section R403.2.2 to read:
R403.2.2 Sealing (Mandatory). Ducts, air handlers, and filter boxes shall be sealed. Joints and seams shall comply with either the IMC or the IRC, as applicable. Verification of compliance with this section shall be in accordance with either Section R403.2.2.1 or Section R403.2.2.2.Exceptions:
- Air-impermeable spray foam products shall be permitted to be applied without additional joint seals.
- Where a duct connection is made that is partially inaccessible, three screws or rivets shall be equally spaced on the exposed portion of the joint so as to prevent a hinge effect.
- Continuously welded and locking-type longitudinal joints and seams in ducts operating at static pressures less than 2 inches of water column (500 Pa) pressure classification shall not require additional closure systems.
- Change Section R403.2.2.1 to read:
R403.2.2.1 Testing option. Duct tightness shall be verified by either of the following:
Exception: The total leakage test is not required for ducts and air handlers located entirely within the building thermal envelope.
- Post-construction test: Total leakage shall be less than or equal to 6 cfm (169.9 L/min) per 100 square feet (9.29 m2) of conditioned floor area when tested at a pressure differential of 0.1 inch w.g. (25 Pa) across the entire system, including the manufacturer's air handler enclosure. All register boots shall be taped or otherwise sealed during the test.
- Rough-in test: Total leakage shall be less than or equal to 5 cfm (141.5 L/min) per 100 square feet (9.29 m2) of conditioned floor area when tested at a pressure differential of 0.1 inch w.g. (25 Pa) across the system, including the manufacturer's air handler enclosure. All register boots shall be taped or otherwise sealed during the test. If the air handler is not installed at the time of the test, total leakage shall be less than or equal to 5 cfm (141.5 L/min) per 100 square feet (9.29 m2) of conditioned floor area.
When this option is chosen, testing shall be performed by approved qualified individuals, testing agencies or contractors. Testing and results shall be as prescribed in Section R403.2.2 and approved recognized industry standards.
- Add Section R403.2.2.2 to read:
R403.2.2.2 Visual inspection option. In addition to the inspection of ducts otherwise required by this code, when the air handler and all ducts are not within conditioned space and this option is chosen to verify duct tightness, duct tightness shall be considered acceptable when the requirements of Section R403.2.2 are field verified.
- Add Section R403.2.2.3 to read:
R403.2.2.3 Sealed air handler. Air handlers shall have a manufacturer's designation for an air leakage of no more than 2 percent of the design air flow rate when tested in accordance with ASHRAE 193.
- Change Section R403.4.2 to read:
R403.4.2 Hot water pipe insulation (Prescriptive). Insulation for hot water pipe with a minimum thermal resistance (R-value) of R-3 shall be applied to the following:
- Piping larger than 3/4 inch nominal diameter.
- Piping serving more than one dwelling unit.
- Piping located outside the conditioned space.
- Piping from the water heater to a distribution manifold.
- Piping located under a floor slab.
- Buried piping.
- Supply and return piping in recirculation systems other than demand recirculation systems.
- Delete Table R403.4.2.
- Change Section R403.6 to read:
R403.6 Equipment and appliance sizing. Heating and cooling equipment and appliances shall be sized in accordance with ACCA Manual S or other approved sizing methodologies based on building loads calculated in accordance with ACCA Manual J or other approved heating and cooling calculation methodologies.
Exception: Heating and cooling equipment and appliance sizing shall not be limited to the capacities determined in accordance with Manual S or other approved sizing methodologies where any of the following conditions apply:
- The specified equipment or appliance utilizes multi-stage technology or variable refrigerant flow technology and the loads calculated in accordance with the approved heating and cooling methodology fall within the range of the manufacturer's published capacities for that equipment or appliance.
- The specified equipment or appliance manufacturer's published capacities cannot satisfy both the total and sensible heat gains calculated in accordance with the approved heating and cooling methodology and the next larger standard size unit is specified.
- The specified equipment or appliance is the lowest capacity unit available from the specified manufacturer.
- Change Section R404.1 to read:
R404.1 Lighting equipment (Mandatory). A minimum of 50 percent of the lamps in permanently installed luminaires shall be high-efficacy lamps or a minimum of 50 percent of the permanently installed luminaires shall contain only high-efficacy lamps.
Exception: Low-voltage lighting shall not be required to utilize high-efficiency lamps.
- Change the "Glazing" and "Air exchange rate" categories of Table R405.5.2(1) to read:
GlazingaTotal areab is 15% of the conditioned floor area.Orientation: equally distributed to four cardinal compass orientations (N, E, S & W).U-factor: from Table N1102.1.3 (R402.1.3).SHGC: From Table N1102.1.1 (R402.1.1) except that for climates with no requirement(NR) SHGC = 0.40 shall be used.Interior shade fraction: 0.92-(0.21 x SHGC for the standard reference design)External shading: none.As proposedAs proposedAs proposedAs proposed0.92-(0.21 x SHGC as proposed)As proposed Air exchangerate Air leakage rate of 5 air changes per hour at a pressure of 0.2 inches w.g (50 Pa).The mechanical ventilation rate shall be in addition to the air leakage rate and thesame as in the proposed design, but no greater than 0.01 × CFA + 7.5 × (Nbr + 1)where:CFA = conditioned floor areaNbr = number of bedroomsEnergy recovery shall not be assumed for mechanical ventilation. For residences that are not tested, thesame air leakage rate as the standardreference design. For tested residences,the measured air exchange ratec.The mechanical ventilation rated shallbe in addition to the air leakage rateand shall be as proposed.