Title 24 Roof Insulation Requirements

California s building energy efficiency standards for residential and nonresidential buildings title 24 part 6 contains requirements for the thermal emittance three year aged reflectance and solar reflectance index sri of roofing materials used in new construction and re roofing projects.

Title 24 roof insulation requirements.

Builders can still use above deck insulation with performance. A cool roof absorbs less heat as it reflects more light from the sun. The title 24 mandatory measures do not require unheated slab insulation but when the prescriptive requirements call for it zone 16 the mandatory measures require that the insulation material must be suitable for the application and meet the requirements. Title 24 defines the requirements for aws in joint appendix 4 section ja4 1 6.

The title 24 prescriptive requirements divide roofs into two categories low slope less than 2 12 pitch and steep slope greater than 2 12 pitch. Below deck insulation is still a prescriptive option. R 30 johns manville formaldehyde free fiberglass batts air seal the roof deck eaves and gables before installation r 22 johns manville corbond spray foam spf insulates and air seals in one step. New insulation requirements below the roof deck increased from r 13 to r 19 in climate zones 4 8 16.

For multifamily r 13 is allowed in zones 10 and 16. The basics of aws are 24 o c. While title 24 applies to all residential and non residential buildings in the state the specific requirements for roofs are dependent on geographic location building use residential non residential type of construction new construction additio n or re roofing building type low rise high rise low slope high slope etc. Then determine the weight of the roofing material.

Johns manville has several insulation solutions that meet the unvented attic insulation requirements of title 24 including. Framing single top plates 2 stud corners reduced header size reduced t wall connections and stacked framing across stories. The location of ducts and ahu in conditioned space is still an option.