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.

California attic insulation requirements.

Insulation level are specified by r value. The table below shows what levels of insulation are cost effective for different climates and locations in the home. 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. R value is a measure of insulation s ability to resist heat traveling through it.

Cepe certified energy consultants experienced low rates same day turnaround. What is california s recommended attic insulation r value as you can imagine the r value for insulating an attic in alaska isn t necessarily going to be the same for insulating an attic in california. The higher the r value the better the thermal performance of the insulation.