Rigid Insulation R Values Roof

Rsi r value système international is the metric equivalent.

Rigid insulation r values roof.

I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number. Most insulation manufacturers will first list their insulation s r value for a one inch sample then they ll give you a chart demonstrating the other r values you can achieve if you install a thicker version of their product. Owens corning insulation products help improve thermal performance and control moisture in commercial institutional and. R3 r18 r21 total roof r value.

To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. Let s use the r value of iko s polyiso insulation enerfoil tm as an example. The lttr a 15 year time weighted average r value is largely affected by thermal aging where air diffuses in and blowing agent diffuses out of the foam. Resources johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency.

R value is used as a measurement of the effectiveness of thermal insulating materials. The higher the r value the greater the insulation performance. R panel is manufactured with a closed cell polyisocyanurate foam core bonded to fiberglass reinforced facers and designed for use over metal nailable and non nailable roof decks with a variety of membrane systems. R value measures how well certain building insulation materials can resist heat.

The higher the r value the better a material performs as a thermal insulator. To convert rsi to r value multiply the rsi by 5 67826. When determining how much insulation you need don t guesstimate calculate. Know exactly how much you need with our project calculators.

Rigid foam insulation packs a lot of r value into a thin package but not all rigid foam performs the same. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1 93721. Foamular xps roof insulation for commercial buildings page 5 foamular xps roof insulation for commercial buildings foamular xps insulation is a rigid foam insulation which meets the needs of today s design professionals for a truly sustainable insulation product. The thicker the foam core the slower the diffusion and thermal aging which is why the r inch increases with thicker board.

Calculate percent improvement in r value.