Roof Insulation R Value Per Inch

Closed cell spray foam has a far better r value per inch than other less effective insulations like cellulose fiberglass or even open cell foam. Does not consider presence absence of reflective barriers. R value measures how well certain building insulation materials can resist heat.

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All these have r values ranging from r 3 2 to r 3 8 per inch.

Roof insulation r value per inch.

The r value of closed cell foam is r 6 5 7 per inch. To convert rsi to r value multiply the rsi by 5 67826. Know exactly how much you need with our project calculators. To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826.

Does not consider internal convection effects. Air gap or air film 3 4 air space insulating properties. When determining how much insulation you need don t guesstimate calculate. The higher the r value the greater the insulation performance.

The r 0 87 value for the first value in this air r value table subsection. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1 93721. Contractors often use it to insulate under slabs ceilings walls and roofs.

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