Roof Insulation Requirements California

California energy commission robert b.

Roof insulation requirements california.

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. Floor insulation should not cover foundation vents. Minimum insulation r value requirements non residential above roof deck. Insulation hangers should be spaced at 18 inch or less prior to rolling out the insulation.

R value is a measure of insulation s ability to resist heat traveling through it. Continuous insulation zones ashrae 90 1 ashrae 189 1 igcc ibc iecc. Insulation level are specified by r value. Minimum insulation r value requirements non residential above roof deck.

Roof and ceiling insulation for prescriptive additions of 700 square feet or less require r 38 minimum in climate zones 1 11 16. Section 110 8 mandatory requirements for insulation roofing products and radiant barriers 110 section 110 9 mandatory requirements for lighting control devices and systems. 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. State applicable energy ashrae zone minimum r value state.

The higher the r value the better the thermal performance of the insulation. Netting or mesh should be nailed or stapled to the underside of the joists. Mandatory minimum r 22 attic insulation unvented attics must be air sealed at roof deck eaves gables and penetrations. Insulation hangers are heavy wires up to 48 inches long with pointed ends which provide positive wood penetration.

Gables to be insulated as exterior walls. Iecc 2015 requirements by climate zone 3. A radiant barrier is required in climate. As of january 1 2010 the california energy commission s updated title 24 building energy efficiency standards for residential and non residential roofing are now in force otherwise know as cool roof.

California energy commission edmund g. The new cool roof requirements affect new construction significant repairs of existing roofs re roofing plus additions and alterations of existing buildings and homes. 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. Or r 30 minimum in climate zones 2 10.