Roof System R Values

0 00 per inch of thickness tpo.

Roof system r values.

The higher the r value the better a material performs as a thermal insulator. The average r value for some common roof materials include. This webpage calculates the r value of walls roofs and suspended floors for most insulation material r values. 5 0 per inch eps insulation.

6 6 per inch of thickness metal. It uses the iso thermal planes method the same method as used in nzs4214 2006. 6 6 per inch xps insulation. The higher the r value the more the material insulates.

0 34 per inch of thickness bur smooth. R value is used as a measurement of the effectiveness of thermal insulating materials. 0 24 per inch of thickness. Here are the r values of the most popular commercial roofing systems.

To convert rsi to r value multiply the rsi by 5 67826. 3 85 per inch polyiso. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1 93721. 0 33 per inch of thickness bur gravel.

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. Eps based claddings directly fixed on timber framing. Rsi r value système international is the metric equivalent. The way it works is simple.

0 24 per inch of thickness epdm. Some of the possible material combinations may not be suitable for actual constructions i e.