Perlite Roof Insulation R Value

R value is used in the united states.

Perlite roof insulation r value.

Factory cut taper that is easy to install and cut builds slope into an otherwise flat roofing system allowing water to drain freely off the roof. Perlite roof insulation description energyguard perlite roof insulation is a homogeneous board composed of expanded perlite particles selected binders and cellulose fibers which give energyguard perlite roof insulation its insulating efficiency. Consists of recycled newsprint to. The surface is treated to reduce bitumen absorption assuring proper adhesion of roof membranes.

To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. Low thermal insulation board. Perlite roof insulation code compliance thermal performance 1 thickness nominal r value resistance inches mm hr ft 2 f btu m c w 3 4 19 1 2 0 0 35 1 25 4 2 7 0 48 1 1 2 38 1 4 1 0 72 2 51 5 4 0 95 3 76 8 1 1 47 for use over metal decks the minimum thickness of energyguard perlite insulation over metal decks is as follows. The r value of the insulating concrete depends on its unit weight and thickness.

To convert rsi to r value multiply the rsi by 5 67826. The bag in which the perlite or vermiculite is purchased recommends the mix proportions needed to achieve various unit weights of fresh concrete and oven dry concrete. Provides good dimensional stability excellent insulation value with stable r value and fire resistance. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1.