Perlite Roof Insulation R Value

Rsi r value système international is the metric equivalent.

Perlite roof insulation r value.

Provides good dimensional stability excellent insulation value with stable r value and fire resistance. Composed of expanded perlite reinforcing cellulosic fibers and selected binders. Provides good dimensional stability excellent insulation value with stable r value and fire resistance. Consists of recycled newsprint to.

R value is used in the united states. 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 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.

To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. The surface is treated to reduce bitumen absorption assuring proper adhesion of roof membranes. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1. 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.