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ISO 95+ GL Insulation

Firestone Building Products

ISO 95+ GL 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 ISO 95+ GL flat and tapered roof insulation consist of a closed-cell polyiso foam core laminated to a black glass reinforced mat facer on both major surfaces. Flat and tapered ISO 95+ GL insulation provides outstanding thermal performance on commercial roofing applications while providing positive rooftop drainage to help eliminate ponding water when tapered ISO 95+ GL insulation is used.



Standard Sizes: 4' 0"


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


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

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

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.



Minimum Recycled

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



Product Density

lbs / ft^3


Compressive Strength



Smoke Development

As defined by the ASTM E84 testing standard

160, 180


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

°F·ft^2·h / BTU

2.9, 5.7, 8.6, 10, 11.4, 12.9, 14.4, 15.9, 17.4, 18.9, 20.5, 22, 23.6, 25.2, 26.8

Firestone Building Products