Roof Insulation Requirements California

California energy commission edmund g.

Roof insulation requirements california.

Climate zones 1 5 and 8 16 wall assemblies must not exceed a maximum u factor of 0 051 climate zones 6 7 wall assemblies must not exceed a maximum u factor of 0 065. Roofing requirements for the design materials construction and quality of roof assemblies and structures for commercial buildings are listed in california building code chapter 15. The new cool roof requirements affect new construction significant repairs of existing roofs re roofing plus additions and alterations of existing buildings and homes. State applicable energy ashrae zone minimum r value state.

A radiant barrier is required in climate. The california building code covers many of the same topics as the california roofing requirements including weather protection fire classification roof insulation requirements for roof coverings and suitable materials to use. Insulation level are specified by r value. Roof and ceiling insulation for prescriptive additions of 700 square feet or less require r 38 minimum in climate zones 1 11 16.

R value is a measure of insulation s ability to resist heat traveling through it. The higher the r value the better the thermal performance of the insulation. Or r 30 minimum in climate zones 2 10. The table below shows what levels of insulation are cost effective for different climates and locations in the home.

Netting or mesh should be nailed or stapled to the underside of the joists. Browse product options or contact your local insulfoam rep to help you quickly pick the best products to simplify your building envelope needs and fit your project budget all with one supplier. Continuous insulation zones ashrae 90 1 ashrae 189 1 igcc ibc iecc. Section 110 8 mandatory requirements for insulation roofing products and radiant barriers 110 section 110 9 mandatory requirements for lighting control devices and systems.

Insulation hangers should be spaced at 18 inch or less prior to rolling out the insulation. Insulation hangers are heavy wires up to 48 inches long with pointed ends which provide positive wood penetration. Iecc 2015 requirements by climate zone 3. Mandatory minimum r 22 attic insulation unvented attics must be air sealed at roof deck eaves gables and penetrations.

Floor insulation should not cover foundation vents. California energy commission robert b. Minimum insulation r value requirements non residential above roof deck. Minimum insulation r value requirements non residential above roof deck.