California Attic Insulation Requirements

The table below shows what levels of insulation are cost effective for different climates and locations in the home.

California attic insulation requirements.

While federal and in some cases state guidelines for insulation levels are merely recommendations the local building code is the true authority over insulation requirements. Title 24 insulation requirements california title 24 energy reports and calcs for all projects. R value is a measure of insulation s ability to resist heat traveling through it. High performance attics prescriptive attic options climate zone hvac duct insulation leakage radiant barrier r 30 at ceiling attic floor r 38 at ceiling attic floor fiberglass below roof deck between rafters air handler ducts in the attic option b 1 r 6 or r 8 depending on cz all with 5 leakage 2 3.

Yes energy cost savings for california resulting from the state updating its commercial and residential building energy codes in accordance with federal law are significant estimated to be on the order of nearly 680 million annually by 2030. The higher the r value the better the thermal performance of the insulation. Insulation level are specified by r value.