THE CITY OF FAYETTEVILLE ADOPTED THE 2009 INTERNATIONAL ENERGY CONSERVATION CODE (IECC) ON JULY 17, 2012

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1 THE CITY OF FAYETTEVILLE ADOPTED THE 2009 INTERNATIONAL ENERGY CONSERVATION CODE (IECC) ON JULY 17, 2012 Compliance with the code for new residential construction, additions, and substantial remodels will be required as of September 3, All new residential construction requires a Home Energy Rating (HERS) completed by an independent RESNET certified home energy rater prior to the issuance of a Certificate of Occupancy. For information on HERS, visit SIGNIFICANT CHANGES FROM THE 2003 IECC Thermal Envelope Updates o U-factors for windows changed from.41 to.35 o U-factor for skylights (.60) was added o R-factor for slabs increased from R-4 to R-10 (2 ft depth) o R-factor for mass walls changed to R-5/10 (R-10 if more than half of the insulation is on interior of wall) o Building envelope sealing and testing requirements were added Ductwork requirements o All ducts outside thermal envelope must be verified as sealed by a tightness test. Testing is not required if all ducts are inside the thermal envelope. o Supply ducts must be insulated to R-8 in attic o Ducts in all other locations must be insulated to R-6 50% of lighting fixtures to be high efficacy No trade-off credits allowed for high-efficiency HVAC Programmable thermostats must be programmed to a heating set point of 70 degrees and cooling set point of 78 degrees New construction requires a label showing estimated monthly utility costs and the level of efficiency achieved for each new residential structure. New wood-burning fireplaces must have gasketed doors and outdoor combustion air For more details on the 2009 IECC requirements, visit or visit to order the 2009 IECC book. The City of Fayetteville will offer information covering the new requirements in August and September. If you have any questions related to the 2009 IECC, please contact Vel Moses at or vmoses@ci.fayetteville.ar.us

2 Home Energy Rating System (HERS) Requirements for New Construction The 2009 IECC scope includes residential singlefamily housing and multifamily housing three stories or less above grade. Compliance with the code for new residential construction, additions, and substantial remodels will be required as of September 3, All new residential construction shall have a home energy rating completed by an independent RESNET certified home energy rater, or equivalent, prior to the issuance of a Certificate of Occupancy. Additions, alterations, and renovations to existing residential structures shall comply with the standards of the 2009 IECC, but will not be required to provide a Home Energy Rating or post a decal. The Residential Energy Services Network (RESNET) is a not-for-profit, membership corporation and a recognized national standardsmaking body for building energy efficiency rating and certification systems in the United States. Because more efficient buildings reduce stress on our electricity grid and natural gas supplies while saving money and resources for our citizens, the City of Fayetteville adopted the 2009 International Energy Conservation Code (IECC) for residential structures on July 17, HOME ENERGY RATING SYSTEM (HERS) The HERS, or Home Energy Rating System, developed by RESNET, is the nationally recognized system for inspecting and calculating a home s energy performance and determining what improvements can make the home more efficient. It does not make the energy-related requirements of the code more stringent; rather, it measures the performance of what is constructed to ensure it meets the adopted 2009 IECC. Revision Date 10/12/2012 Page 1 of 3

3 The HERS Index is a numerical scale, with 100 as the relative value of a home built to the 2006 IECC Energy Code. A HERS Index of 65, for example, means that the home uses about 35% less energy than a code-built, or reference home with an index of 100. An inefficient home may have a HERS Index well above 100. The HERS rater will require Scale drawings of the floor plan, including window and door locations, ceiling heights, and mechanical equipment locations. Exterior wall sections Slab insulation details Foundation wall sections Insulation type and R-values for walls, ceilings and floors Heating and air equipment o Type, capacity, & efficiency o Ductwork location and R-value Window and door schedule o U-factors o SHGC values Water heater o Type, capacity, & efficiency Other energy feature information, such as solar hot water heaters, photovoltaic panels, passive solar design, etc. Projected Rating It is strongly recommended that a rater perform energy modeling and obtain a projected rating BEFORE framing begins. The HERS rater performs a pre-construction plan review and energy modeling to determine whether the project as proposed will meet performance requirements of the 2009 IECC. The rater analyzes energy feature options and helps the builder select the most costeffective mix of options to achieve 2009 IECC compliance plus whatever additional level of energy performance may be desired. Window/Door Inspection: Verifies installation and specifications HVAC Duct Testing At Rough-in: Avoids duct leakage failure at final inspection Final Inspection and Testing Duct Leakage Test: A special fan unit is attached to a return air plenum, the supply registers are taped off, and the duct system is then pressurized to a standard level. This test gives the Total Duct Leakage. Duct leakage to outside is potentially a very large loss of energy when supply ducts leak. Leaking return ducts are a source of indoor air pollution, pulling unconditioned, contaminated air into the home. Duct leakage tests can also be performed at rough-in, prior to a framing inspection, which will allow for easy access to correct any deficiencies. However, if modifications are made to the HVAC system, damage occurs, or visual inspection indicates lack of proper sealing at the final inspection, a second test may be required at the final inspection. Blower Door Test: This test measures the leakiness of the building envelope. The house is depressurized to a standard amount using a powerful calibrated fan in an exterior door opening. A digital pressure gauge measures the volume of air being moved at that pressure. A target level of air tightness for a home is no more than 0.35 Natural Air Changes per Hour (NACH). Pre-Drywall Inspections Thermal Bypass Inspection: Identifies areas that may cause building air infiltration failure at final test-out Insulation Inspection: Verifies and grades wall and floor insulation Revision Date 10/11/2012 Page 2 of 3

4 Mechanical Equipment Verification Ceiling Insulation Inspection Major Appliance Inspection Generate Confirmed Rating Test results and as-built data are entered into the modeling software and the final HERS index score is generated along with confirmation that requirements of the 2009 IECC have been met. Documents and Certificates The HERS rater will issue a Certificate of Compliance to the City and the Owner/Builder in order for certain inspections, such as framing and a final, to be scheduled. Performance Testing & Labeling Residential developments that utilize the exact same floor plan multiple times shall have a Home Energy Rating completed on a minimum of 20% of the residential units. Sampling protocol must conform to RESNET standards. This brochure presents an overview of the Home Energy Rating System. For more details, visit The City of Fayetteville will offer information covering the new requirements related to the 2009 IECC in August If you have any questions, please contact Vel Moses at or vmoses@ci.fayetteville.ar.us Revision Date 10/11/2012 Page 3 of 3

5 2009 International Energy Conservation Code (IECC) General Information HERS informational brochure. It is strongly recommended that a rater perform energy modeling and obtain a projected rating BEFORE framing begins. The 2009 IECC is designed to save the consumer in utility costs. An analysis comparing the same 1,824 sq. ft. structure constructed under both the 2003 IECC and the 2009 IECC estimated an annual energy cost savings of $267 for the gas home and $344 for the electric home with the new code. The additional cost for building to the higher efficiency standards was $2,049 or, amortized over a 30 year loan, $132 annually. This represents a net average annual energy savings for the home built to 2009 IECC standards of $135 for the gas heated home and $209 for the electric heated home. SIGNIFICANT CHANGES FROM 2003 IECC 1. Thermal Envelope Updates Because more efficient buildings reduce stress on our electricity grid and natural gas supplies while saving money and resources for our citizens, the City of Fayetteville adopted the 2009 International Energy Conservation Code (IECC) for residential structures on July 17, The 2009 IECC scope includes residential singlefamily housing and multifamily housing three stories or less above grade. Compliance with the code for new residential construction, additions, and substantial remodels will be required as of September 3, New Construction projects will require testing by a RESNET Certified Home Energy Rater. See the 2003 IECC 2009 IECC Ceiling R-38 R-38 Skylight U-factor N/A 0.60 Fenestration U- factor Fenestration SHGC N/A N/A Wood Frame Wall R-13 R-13 Mass Wall R-8.1 R-5/10* Floor R-19 R-19 Basement Wall R-10/13** R-10/13** Slab R-4 R-10, 2 ft depth Crawlspace Wall R-10/1388 R-10/13** * The second R value applies when more than half the insulation is on the interior of the mass wall ** The first R value applies to exterior continuous insulation, the second to interior framing cavity insulation; either insulation meets the requirement Revision Date 10/12/2012 Page 1 of 3

6 2. Sealing Requirements Building Envelope Sealed with caulking materials or closed with gasketing systems Joints and seams sealed or taped or covered with a moisture vapor-permeable wrapping material Seal all floor and ceiling penetrations Recessed Lighting Fixtures All recessed luminaires shall be IC rated and labeled as meeting ASTM E 283 when tested at 1.57 psf (75 Pa) pressure differential with no more than 2.0 cfm of air movement from the conditioned space to the ceiling cavity and sealed with a gasket or caulk between the housing and interior wall or ceiling covering. 3. Ductwork Requirements All ducts outside thermal envelope shall be verified as sealed by a tightness test. Testing is not required if all ducts and air handler are inside the thermal envelope. Supply ducts in attics must be insulated to R-8. All other ducts outside thermal envelope must be insulated to R Lighting A minimum of 50 percent of the permanently installed lighting fixtures shall use high-efficacy lamps (light bulbs). 5. Trade-off Credits Trade-off credit for high-efficiency HVAC will no longer be allowed. 6. Performance Testing & Labeling All new residential construction shall have a Home Energy Rating completed by an independent RESNET certified home energy rater, or equivalent, prior to the issuance of a Certificate of Occupancy. See Until the home is occupied, a decal shall be posted in a very prominent location near the front entry showing the estimated monthly utility cost. A permanent decal shall be posted on or in the electrical distribution panel that lists the R-values of the insulation in the ceiling/roof, walls, foundation and ducts, outside the conditioned space. Also, the decal shall list U-factors for windows, the types and efficiencies of heating, cooling, and water heating equipment. Additions, alterations, and renovations to existing residential structures shall comply with the standards of the 2009 IECC, but will not be required to provide a Home Energy Rating or post a decal. COMPLIANCE PATHS Prescriptive Path: (Only for additions and remodels) The IECC has a single table of requirements for insulation R-values and window and door U-factors. Total Building Envelope Path: UA (U factor multiplied by area using REScheck software) Based on the prescriptive U-factor table, this path allows trade-offs whereby some energy efficiency measures can fall below code requirements if balanced by other measures that exceed code requirements. Simulated Performance Path: This path allows compliance if the home has a calculated annual energy consumption (or energy cost) equal to or less than that of a standard reference design that just meets the code s prescriptive requirements. This path allows for crediting energy efficiency measures Revision Date 10/11/2012 Page 2 of 3

7 not accounted for in the other paths, such as renewable energy measures. This path is the most flexible for the builder. This brochure presents an overview of the main changes in the 2009 IECC. For more details on all of the 2009 IECC requirements, visit The City of Fayetteville will begin offering information covering the new requirements in August If you have any questions related to the 2009 IECC, please contact Vel Moses at or Revision Date 10/11/2012 Page 3 of 3

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9 PENETRATIONS F gure Nl102.4 TYPICAL SOURCES OF AIR LEAKAGE IN THE HOME BAFFLING TO PREVENT INSULATION Figure N (l ) TYPICAL ROOF ASSEMBLY

10 tu a = insulation depth a+b=insulat ondepih Figure N SLAB EDGE INSULATION METHODS EXTERIOR GRADE LINE INSULATION I A l._e J CONTINUOUS VAPOR RETARDER A+ B > 24 ln. F gure Nl CRAWLSPACE WALL INSULATION

11 RIGID BOARD INSULATION R-6 B IN. CONCRETE BLOCK For Sl:1 inch = 25.4 mm. Figure (11 EXTERIOR INSULATION

12 RIGID INSULATION _ R 1/z ln. GYPSUM BOARD R-13 FIBERGI.ASS BATT INSULATION VINYL SIDING 2x4Nf16 ln.o/c For Sl: 1 inch = 25.4 mm.. Figure N EXTER OR R.VALUES

13 4lN. FACE BRICK 1/z ln. GYPSUM BOARD R-13 FIBERGLASS BATT INSULATION 2x4Ar 16lN. O/C E EE For Sl:1 inch = 25.4 mm. Figure (21 INTERIOR INSULATION