IECC Compliance Guide for Homes in Virginia

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1 IECC Compliance Guide for Homes in Virginia Amended Version of 2012 International Energy Conservation Code July 14, 2014 Climate Zone Since the entire state of Virginia falls in the IECC Climate Zone 4, the requirements will be the same state-wide except for where local jurisdictions chose to add additional requirements. The 2012 International Energy Conservation Code The 2012 IECC was developed by the International Code Council (ICC) and is currently available to states for adoption. The IECC is the national model standard for energy-efficient residential construction recognized by federal law. Users of this guide are strongly recommended to obtain a copy of the IECC and refer to it for any questions and further details on compliance. To obtain a copy of the 2012 IECC, contact the ICC or visit IECC compliance training is also available for many sources. Limitations This guide is an energy code compliance aid for Virginia based upon the simple prescriptive option of the 2012 IECC. It does not provide a guarantee for meeting the IECC. This guide is not designed to reflect the actual energy code, with amendments, if any, adopted in Virginia and do not, therefore, provide an guarantee for meeting the state energy code. For details on the energy code adopted by Virginia, including how it may differ from the IECC, please contact your local building code official. Zone 4 Fenestration U-Factor Windows Insulation Foundation Skylight U-Factor Glazed Fenestration SHGC Ceiling R-38* Wood Frame Wall R-15 or ** Mass Wall R Value Floor Basement Wall Slab R- Value and Depth Crawl Space Wall 8/ /13 10, 2 ft 10/13 * R-30 if uncompressed, full height insulation extends over wall top plate at eaves ** Wood Frame Wall U-Factor: U (VA Amendment to Table R ) The simplified table of building envelope requirements above applies to new residential buildings, as defined in the IECC and Virginia amendments, with wood framing and/or mass walls. For steel-framed buildings, the same window requirements apply; however, refer to IECC section R for specific ceiling, wall and floor insulation R-value requirements. The table also applies to all additions, alterations, renovations and repairs including replacement windows. The table is based upon the thermal envelope requirements in the 2012 IECCs prescriptive compliance option for Climate Zone 4 (Table R ). Fenestration (IECC Sections R , R402.3, R402.5) Fenestration (including all windows and doors) and Skylight U-factors are maximum acceptable levels. The Glazed Fenestration SHGC maximums apply to all windows, skylights and glazed doors. An area-weighted average for fenestration products is permitted to satisfy these requirements

2 IECC Compliance Guide for Homes in Virginia Amended Version of 2012 International Energy Conservation Code July 14, 2014 Fenestration (Continued) Window, door and skylight U-factors and SHGC s must be determined from a National Fenestration Rating Council (NFRC) rating that is independently certified and set forth on a label on the product. Windows, skylights and sliding glass doors must have an air infiltration rate of < 0.3 cfm/sf and be labeled as such. Swinging doors must have an air infiltration rate of < 0.5 cfm/sf and be labeled as such. Up to 15 sf of glazed fenestration is permitted to be exempt for the U-factor and SHGC requirements. One sidehinged opaque door assembly up to 24 sf is exempted from the Fenestration U-factor requirement. These exceptions apply for the prescriptive path only. Special exceptions may apply for Fenestration U-factor requirements in thermally isolated sunrooms. (see IECC sectionr ) Insulation (IECC Sections R and R402.2) Insulation R-values are minimum acceptable levels and must be determined according to the FTC rule R-values for walls represent the sum of the cavity insulation plus insulating sheathing, if any. The second R-value for mass walls applies when more than half the insulation is on the interior of the mass wall. The insulation for basement walls must be from the top of the wall down 10ft below grade or to the basement floor, whichever is less. Insulation for crawl space walls are further specified in IECC section R Floor insulation must be installed to maintain contact with the underside of the subfloor decking Access doors from conditioned spaces to unconditioned spaces (e.g., attics and crawl spaces) shall be weather stripped and insulated to a level equivalent to the insulation on the surrounding surfaces. Exceptions are hinged vertical doors : R-5 and pull-down stairs R-5 over a minimum of 75% of panel area. Insulation requirements for slab or on grade floors are further specified in IECC section R R-5 shall be added to the required slab edge R-values for heated slabs Eave baffles are required for air-permeable insulation installed in a vented attic. Special insulation provisions related to ceilings with attic spaces, ceilings without attic spaces, masonry veneer and thermally isolated sunrooms are set forth in IECC section R402. Ducts (IECC Section R403.2) For ducts and air handlers outside of conditioned space, duct leakage and sealing must be verified by one of the following options: o Visual inspection of all sealing joints and seams OR o Testing option at rough-in or post construction with measurements taken at 25 Pascals pressure differential. Rough-in < 5 cfm/100sf conditioned floor area; Post construction < 6cfm/100 sf conditioned floor area. Supply ducts in unconditioned attics shall be sealed and insulated to a minimum of R-8. All other ducts in unconditioned space shall be sealed and insulated to a minimum of R-6. Ducts or portions thereof located completely inside the building thermal envelope are exempted from the insulation requirement. Air handlers and filter boxes must be properly sealed. Air handlers must have manufacture designation that air leakage through cabinet does not exceed 2% of the designed air flow rate

3 IECC Compliance Guide for Homes in Virginia Amended Version of 2012 International Energy Conservation Code July 14, 2014 Air Sealing (IECC Section R402.4) The building envelope air sealing must be verified through either: o Visual inspection and field verification of air barrier and insulation installation according to Table R with Virginia Amendments OR o Testing option verifying air leakage rate not to exceed 5 50 Pascals. o Air sealing requirement triggers a requirement for Whole House Mechanical Ventilation regardless whether verification is done visually or via testing. Systems (IECC Section R403) HVAC system must be properly sized in accordance with ACCA Manual S based on building loads calculated in accordance with ACCA Manual J or other approved method. Some exceptions apply, see Virginia Amendments A programmable thermostat must be installed to control primary heating or cooling system and shall have capabilities according to Section R Specific requirements apply to circulating hot water systems, snow melt systems and swimming pools Whole House Mechanical Ventilation (IECC Section R403) Whole House Mechanical Ventilation fans (e.g., exhaust fans meant to run continuously) are required to have minimum efficiencies per Table R Central fan integrated systems (e.g., an outdoor air duct and damper connected to the return trunk of a central air handler with associated controls) are required to have an electrically commutated motor (ECM). Whole House Mechanical Ventilation is required per the International Residential Code (IRC) or International Mechanical Code (IMC) and must be fitted with automatic dampers Lighting A minimum of 50% of lamps in permanently installed fixtures must be high-efficacy as defined by IECC Documentation The appropriate construction documents must be provided. Preventative and routine maintenance instructions must be furnished and/or posted. A permanent certificate listing the following information must be posted onsite: o R-values of insulation by location o U-factors and SHGC values of fenestration o HVAC equipment efficiencies o Results of envelope and duct system air leakage testing o Light fixture schedule with wattages

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