Attic Insulation Code Requirements
Attic Insulation Code Requirements
Insulating your home’s attic properly is one of the best ways to achieve energy efficiency and comfort. Getting the attic right can help you save money on your energy bills* and prevent problems like ice dams in winter.
Insulation Contractor codes set minimum levels of insulation in a structure based on climate zones. Check the map below to find your state’s zone and its requirements.
Most insulation materials slow conductive and convective heat flow and reduce radiant heat gain. The R-value of insulation tells you how well it resists heat flow. The higher the R-value, the better the insulation performs. Choose a high-performing insulation, like polyiso, to maximize your savings and efficiency.
Tips for Proper Insulation Coverage: Avoiding Gaps and Weak Spots
The insulation shall extend up and over the attic floor joists and across the attic floor and rafters. Insulation in unvented attics shall be a combination of cavity and continuous insulation, with the combined R-value equaling the required R-value for floors.
Where a crawl space wall is unheated and not conditioned, the walls shall be insulated to the level specified in Table N1102.1.3. The insulation shall be in contact with the Class I vapor retarder and shall be fastened securely.
Air leakage is an important factor in the performance of a building envelope, and the tighter the building envelope, the more energy savings you can realize. Fiberglass and mineral wool insulation can meet or exceed new code air leakage requirements without requiring expensive materials such as spray foam.
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