Roof System R Values

6 6 per inch xps insulation.

Roof system r values.

The higher the r value the better a material performs as a thermal insulator. R value table for roofing materials and building insulation. It uses the iso thermal planes method the same method as used in nzs4214 2006. 0 24 per inch of thickness epdm.

Rsi r value système international is the metric equivalent. 0 00 per inch of thickness tpo. To convert rsi to r value multiply the rsi by 5 67826. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1 93721.

Types of roof insulation. 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. This webpage calculates the r value of walls roofs and suspended floors for most insulation material r values. The higher the r value the more the material insulates.

6 6 per inch of thickness metal. 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. 0 24 per inch of thickness.

Here are the r values of the most popular commercial roofing systems. To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. 0 33 per inch of thickness bur gravel. R value is used as a measurement of the effectiveness of thermal insulating materials.

Eps based claddings directly fixed on timber framing. 3 85 per inch polyiso.