Perlite Roof Insulation R Value

R value is used in the united states. Rsi r value système international is the metric equivalent. The r value of the insulating concrete depends on its unit weight and thickness.

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Perlite roof insulation r value.

Provides good dimensional stability excellent insulation value with stable r value and fire resistance. This also means easy hoisting staging and maneuvering around the roof. Low thermal insulation board. High r value 2 5 r.

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. Provides significantly more thermal insulation r value than wood fiber or gypsum boards. Protector hd allows easy efficient scoring cutting and snapping which permits fast tight fabrication and all in a low dust environment. 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.

Composed of expanded perlite reinforcing cellulosic fibers and selected binders. To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. 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.

The surface is treated to reduce bitumen absorption assuring proper adhesion of roof membranes. 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.