Residential Roof R Value Requirements

Minimum insulation r value requirements non residential above roof deck is an extremely handy table for state and local jurisdictions in the united states.

Residential roof r value requirements.

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 is a measure of insulation s ability to resist heat traveling through it. Quick roofing guide to the international residential code. Minimum insulation r value requirements non residential above roof deck.

Specific insulation requirements of section c402 2 thermal requirements of either. There are two model building codes which form the basis of almost all of the building codes in the united states. R value based method of section c402 1 3 u c and f factor based method of section c402 1 4. Quick roofing guide to the international building code.

Or component performance alternative of section c402 1 5 roof solar reflectance and thermal emittance fenestration in building envelope. Iecc 2015 requirements by climate zone 3. What r value do i need. Below is a table outlining the basic r value requirements for walls roofs and floors.

Note that there are many other requirements and exceptions to these figures depending on the state type of home and materials your home uses. Roofing contractor license verification by state. 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. Minimum insulation r value requirements by state.

Floors over unheated spaces need to be insulated to a minimum of r 19 in zones 3 and 4. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. Insulation level are specified by r value. Required r values for walls roofs and floors.

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. The document was updated in 2020 and is available on the carlisle syntec website. Minimum insulation r value requirements non residential above roof deck. Closed cell spray foam has an r value of about r 6 or r 6 5 per inch.

State applicable energy ashrae zone minimum r value state local ms mississippi ashrae 90 1 2010 2 r 20 3 r 20 state. The higher the r value the better the thermal performance of the insulation.