Roof System R Values

0 24 per inch of thickness epdm.

Roof system r values.

R value table for roofing materials and building insulation. Here are the r values of the most popular commercial roofing systems. Types of roof insulation. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1 93721.

Some of the possible material combinations may not be suitable for actual constructions i e. The average r value for some common roof materials include. The way it works is simple. R value is used as a measurement of the effectiveness of thermal insulating materials.

The higher the r value the more the material insulates. 0 34 per inch of thickness bur smooth. 3 85 per inch polyiso. To convert rsi to r value multiply the rsi by 5 67826.

R value because many states or regions require that a roof system have a minimum amount of thermal resistance on commercial industrial and or institutional buildings. 6 6 per inch of thickness metal. Rsi r value système international is the metric equivalent. 0 00 per inch of thickness tpo.

0 24 per inch of thickness. It uses the iso thermal planes method the same method as used in nzs4214 2006. 6 6 per inch xps insulation. 5 0 per inch eps insulation.

Eps based claddings directly fixed on timber framing. 0 33 per inch of thickness bur gravel.