Roof System R Values

6 6 per inch xps insulation.

Roof system r values.

Rsi r value système international is the metric equivalent. The higher the r value the more the material insulates. This webpage calculates the r value of walls roofs and suspended floors for most insulation material r values. 3 85 per inch polyiso.

0 33 per inch of thickness bur gravel. Some of the possible material combinations may not be suitable for actual constructions i e. To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. 0 24 per inch of thickness.

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. The average r value for some common roof materials include. To convert rsi to r value multiply the rsi by 5 67826. R value is used as a measurement of the effectiveness of thermal insulating materials.

0 24 per inch of thickness epdm. Types of roof insulation. The way it works is simple. It uses the iso thermal planes method the same method as used in nzs4214 2006.

The higher the r value the better a material performs as a thermal insulator. 0 00 per inch of thickness tpo. R value table for roofing materials and building insulation. 6 6 per inch of thickness metal.

5 0 per inch eps insulation. Eps based claddings directly fixed on timber framing.