Rboard® Rigid Foam Insulation - Wall Sheathing

Rboard Rigid Foam Wall Insulation

Atlas Rboard® rigid foam insulation is a closed cell polyisocyanurate (polyiso) foam core, faced with a non-reflective coated glass-mat facer on both sides. Rboard® combines high R-value, enhanced durability from two coated glass-mat facers, and water resistive attributes in a high performance rigid insulation board. Wall sheathing is suitable for a variety of continuous insulation (CI) applications.

Panel sizes are 4' by 8' or 4' by 9'. Insulation panels can be supplied in nominal 16" or 24" widths for use in cavity wall applications. Custom sizes are also available.

Atlas polyiso has been tested for VOC and formaldehyde emissions, in which reported emissions were below the maximum emission levels allowed under both the GREENGUARD and GREENGUARD Schools and Children criteria. These tests confirm that Atlas polyiso insulation systems are all very low-emitting products.

Why Use Glass-Mat Facers?

The Atlas Wall CI Board line includes coated glass-mat facers, a best-practice building method throughout North America.
The durable, coated glass-mat facers protect the building while the walls are exposed during construction. They are also widely accepted in the building industry, with hundreds of materials tested to work with them as a system – including spray-applied air barriers, peel-and-stick membranes, and more. Coated glass-mat facers have a great installed track record, too. It’s another reason to choose Atlas polyiso for your next project.

Insulation R-Value

Insulation R-value is a measure of thermal resistance used in the building and construction industry. The R-value being discussed is the unit thermal resistance. This is used for a unit value of any particular material. Below is the table of insulation R-value for Atlas RBoard Rigid Foam Insulation. The higher the number, the better the building insulation's effectiveness.


Standard Thickness3 in 0.5 0.75 1.0 1.5 2.0 2.5 3.0 3.5
mm 13 19 25 38 51 64 76 89
R-value1,2 3.0 4.5 6.0 9.0 12.1 15.3 18.5 21.7
1    Conditioned thermal values were determined by ASTM Test Method C518 at 75° mean temperature.
Test specimens were conditioned in accordance with procedures outlined in ASTM C1289, Section 11.1.2.1
2    “R” means resistance to heat flow. The higher the R-value, the greater the insulating power.
3    Other sizes available upon request. Contact your local Atlas sales office.

Highest R, One-Step Polyiso Rigid Wall
Insulation Available. The Choice Is Elementary.

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