Perlite Roof Insulation R Value

Low thermal insulation board.

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. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1. Provides good dimensional stability excellent insulation value with stable r value and fire resistance. Composed of expanded perlite reinforcing cellulosic fibers and selected binders.

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. 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 surface is treated to reduce bitumen absorption assuring proper adhesion of roof membranes. To convert rsi to r value multiply the rsi by 5 67826.

The r value of the insulating concrete depends on its unit weight and thickness. Provides good dimensional stability excellent insulation value with stable r value and fire resistance. Rsi r value système international is the metric equivalent. R value is used in the united states.