USIso TM Roof Insulation, like wood and other organic materials, can release toxic smoke if ignited. USIso Roof Insulation is not for use under shingles. All USIso TM Roof Insulation must be installed according to specifications supplied by the roof membrane manufacturer. Maximum 1 these numerical ratings are not intended to reflect hazards presented by these or any other material under actual fire conditions 2 special order 25 psi. This label shows the R-Value of this insulation.
R means resistance to heat flow.
The higher the R-Value, the greater the insulating power. Compare insulation R-Values before you buy. To achieve the maximum R-Value, it is essential to get instructions and install the insulation properly. All R-Values may change due to testing as printed. Verify R-Value at time of order .