Perlite Roof Insulation R Value

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.

Perlite roof insulation r value.

Rsi r value système international is the metric equivalent. 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. 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.

To convert rsi to r value multiply the rsi by 5 67826. Composed of expanded perlite reinforcing cellulosic fibers and selected binders. Provides significantly more thermal insulation r value than wood fiber or gypsum boards. High r value 2 5 r.

R value is used in the united states. To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. Consists of recycled newsprint to. The r value of the insulating concrete depends on its unit weight and thickness.

Low thermal insulation board. 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.