Residential Roof R Value Requirements

Minimum insulation r value requirements non residential above roof deck.

Residential roof r value requirements.

Required r values for walls roofs and floors. Recommended home insulation r values. Quick roofing guide to the international building code. Minimum insulation r value requirements non residential above roof deck.

Roofing contractor license verification by state. What r value do i need. Minimum insulation r value requirements by state. Or component performance alternative of section c402 1 5 roof solar reflectance and thermal emittance fenestration in building envelope.

Quick roofing guide to the international residential code. State applicable energy ashrae zone minimum r value state local ms mississippi ashrae 90 1 2010 2 r 20 3 r 20 state. Minimum insulation r value requirements non residential above roof deck is an extremely handy table for state and local jurisdictions in the united states. R value is a measure of insulation s ability to resist heat traveling through it.

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. 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. Below is a table outlining the basic r value requirements for walls roofs and floors. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities.

Floors over unheated spaces need to be insulated to a minimum of r 19 in zones 3 and 4. Iecc 2015 requirements by climate zone 3. Note that there are many other requirements and exceptions to these figures depending on the state type of home and materials your home uses. 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.

R value based method of section c402 1 3 u c and f factor based method of section c402 1 4. The document was updated in 2020 and is available on the carlisle syntec website. Closed cell spray foam has an r value of about r 6 or r 6 5 per inch. To meet r 38 in a roof or ceiling you would need about 6 or 6 5 inches of closed cell spray foam.

R value state local al alabama 2015 alabama commercial energy code 2 r 25 3 r 25 state local ak alaska 2012 alaska building energy efficiency. The higher the r value the better the thermal performance of the insulation.