All of our information is sourced from manufacturer data.

RESISTA Insulation

Firestone Building Products

RESISTA Insulation

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Board Insulation Board Insulation

Foam Board Foam Board

Polyisocyanurate Polyisocyanurate

Flat Roof, Sloped Ceiling Flat Roof, Sloped Ceiling

Unfinished Floor Unfinished Floor

Design Options

Product Description

Firestone RESISTA flat and tapered roof insulation consists of a closed-cell polyiso foam core laminated to a specially coated, inorganic, fiberglass facer. RESISTA roof insulation provides outstanding fire, wind and thermal performance for single-ply and modified bitumen commercial roofing applications.



Standard Sizes: 4' 0"


Standard Sizes: 4' 0", 8' 0"


Standard Sizes: 0-1/2", 1", 1-1/4", 1-1/2", 1-3/4", 2", 2-1/2", 3", 3-1/4", 3-1/2", 3-3/4", 4"

Manufacturer Design Notes

Do not install over wet, damp or uneven substrates.

Performance Data

R-Value Per Inch

Measure of the thermal resistance of the product per inch of thickness, imperial units.

°F·ft^2·h / BTU / inch


NRC Value

The Noise Reduction Coefficient values of this product

Fire Resistance

Amount of time the product can withstand fire

Minimum Recycled

The minimum amount of the product's input materials that come from recycled sources



Water Vapor Transmission

An imperial perm is defined as 1 grain of water vapor per hour, per square foot, per inch of mercury

perm (imperial)


Flame Spread

As defined by the ASTM E84 testing standard


Dimensional Stability

The percent that a product's dimensions vary due to aging or environmental conditions.



Product Density

lbs / ft^3



Measure of the thermal resistance of the product, imperial units.

°F·ft^2·h / BTU

2.8, 5.7, 7.1, 8.6, 10, 11.4, 14.4, 17.4, 18.9, 20.5, 22, 23.6

Compressive Strength



Smoke Development

As defined by the ASTM E84 testing standard

160, 180

Firestone Building Products