Residential Roof R Value Requirements

Minimum insulation r value requirements by state.

Residential roof r value requirements.

R value based method of section c402 1 3 u c and f factor based method of section c402 1 4. Recommended home insulation r values. Roofing contractor license verification by state. The document was updated in 2020 and is available on the carlisle syntec website.

Minimum insulation r value requirements non residential above roof deck is an extremely handy table for state and local jurisdictions in the united states. There are two model building codes which form the basis of almost all of the building codes in the united states. Note that there are many other requirements and exceptions to these figures depending on the state type of home and materials your home uses. R value is a measure of insulation s ability to resist heat traveling through it.

Specific insulation requirements of section c402 2 thermal requirements of either. To meet r 38 in a roof or ceiling you would need about 6 or 6 5 inches of closed cell spray foam. 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. What r value do i need.

Minimum insulation r value requirements non residential above roof deck. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. Insulation level are specified by r value. Minimum insulation r value requirements non residential above roof deck.

Quick roofing guide to the international residential code. Closed cell spray foam has an r value of about r 6 or r 6 5 per inch. Below is a table outlining the basic r value requirements for walls roofs and floors. Required r values for walls roofs and floors.

Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. Quick roofing guide to the international building code. State applicable energy ashrae zone minimum r value state local ms mississippi ashrae 90 1 2010 2 r 20 3 r 20 state. Floors over unheated spaces need to be insulated to a minimum of r 19 in zones 3 and 4.

Or component performance alternative of section c402 1 5 roof solar reflectance and thermal emittance fenestration in building envelope. Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value.