Georgia - Building Energy Codes

energycodes.gov

Georgia - Building Energy Codes

Table A.1. Heating Equipment SharesHeating SystemPercent ShareSingle-FamilyMultifamily2012 IECC Georgia Energy Code 2012 IECC Georgia Energy CodeNatural gas 19.0 19.7 24.2 24.6Heat pump 78.9 79.6 74.9 75.3Electric resistance 2.0 0.0 1.1 0.0Oil 0.1 0.1 0.0 0.0Table A.2. Foundation Type SharesFoundation Type Slab on Grade Heated Basement Unheated Basement CrawlspacePercent share 57.1 6.6 9.7 26.7Table A.3. Construction by Building TypeClimate ZoneHousing StartsSingle-FamilyMultifamily2 2,915 5013 10,732 1,0644 1,132 44Differences Between the Georgia Energy Code and the 2012 IECCThe Georgia Energy Code is based on the 2009 IECC but has a number of modifications. Georgia does not allowelectric resistance heat as the primary heat source. In Climate Zone 2, Georgia requires a fenestration U-factorof 0.50 compared to the 2009 IECC requirement of U-0.65. Also, in Climate Zone 4, Georgia requires a maximumsolar heat gain coefficient (SHGC) of 0.30 and the 2009 IECC has no SHGC requirement. This analysis accountsfor these modifications to the 2009 IECC.All versions of the IECC have requirements that apply uniformly to all climate zones, and other requirementsthat vary by climate zone. Highlights of the mandatory requirements across all buildings include:• Building envelope must be caulked and sealed. The 2012 IECC adds a requirement that the buildingmust be tested and a level of leakage that is no more than a maximum limit must be achieved.• Ducts and air handlers must be sealed. Testing against specified maximum leakage rates is required inthe 2012 IECC if any ducts pass outside the conditioned space (e.g., in attics, unheated basements).Supply and return ducts in attics, and all ducts in crawlspaces, unheated basements, garages, orotherwise outside the building envelope must be insulated.• For both the Georgia Energy Code and the 2012 IECC, a minimum percentage of the lighting bulbs orfixtures in the dwelling must be high-efficacy lighting.• A certificate listing insulation levels and other energy efficiency measures must be posted on or near theelectric service panel.A.3 September 2012

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