All of our information is sourced from manufacturer data.

 Tapered ACFoam-III

Atlas Roofing Corporation

Tapered ACFoam-III

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Board Insulation Board Insulation

Foam Board Foam Board

Polyisocyanurate Polyisocyanurate

Flat Roof, Sloped Ceiling Flat Roof, Sloped Ceiling

Design Options

Product Description

Closed-cell polyisocyanurate (polyiso) foam core integrally bonded to inorganic coated glass facers. Tapered ACFoam®-III is offered in a variety of slopes, to achieve positive drainage as well as long-term thermal resistance (LTTR). Available in 4ft x 4ft (1220mm x 1220mm) panels with 1/8” (3mm), 1/4” (6mm) and 1/2” (12mm) per foot slope.
Manufactured using CFC-, HCFC- and HFC-free foam blowing technology with zero ozone depletion potential (ODP) and virtually no (negligible) global warming potential (GWP).
Manufactured and tested for use in new and re-roofing applications.



Standard Sizes: 4' 0"


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


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

Manufacturer Design Notes

Tapered ACFoam®-III is used in built-up (BUR), modified bitumen, metal, ballasted single-ply, mechanically attached single-ply and adhered single-ply roofing systems. These roofing systems depend on proper installation for successful performance.

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


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

°F·ft^2·h / BTU

4.3, 5.7, 7.1, 8.6, 10, 11.4, 12.9

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)


Smoke Development

As defined by the ASTM E84 testing standard

50, 170

Flame Spread

As defined by the ASTM E84 testing standard

40, 60

Dimensional Stability

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



Product Density

lbs / ft^3


Minimum Recycled

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



Compressive Strength



Tensile Strength



Atlas Roofing Corporation