Type 4 XPS Insulation Board 30 PSI


GreenGuard™ Type 4 XPS Insulation Board comprises 1/2” to 3” thick closed-cell polystyrene (XPS) with a minimum compressive strength of 30 psi. It has high water resistance and an R-Value of 0.88 / 25 mm (5.0 per inch) of thickness. It is available in a square edge board or ship-lap edge board.

Please confirm availability with your local Sales Representative or Contact the Regional Sales Office

• R-Value of 0.88 / 25 mm (5.0 per inch) of thickness
• Available with compressive strength of 210 kPa (30 psi)
• Meets or exceeds Type 4 and Types 1, 2, and 3 specifications
• Lightweight, easy to cut with a knife
• Does not absorb moisture
• Retains insulating properties over time
• Can be used to meet code requirements for continuous insulation when installed directly over studs
• Reduces energy loss through the foundation and helps control moisture inside the basement
• Water resistance makes it an excellent choice for foundation and below-slab use

To confirm colour availability by region and gauge, please click here.



Intertek CCRR-1021;
CCMC 12722-L;
MN Dept of Energy Chapter 7640;
FM Approvals- see RoofNav Roof System Listings;
UL LLC – See Classification Certificate A184;
UL LLC – Canada, File R11183.
PLEASE NOTE: These are standard colours and are representative only. Please contact your Vicwest rep for Special Orders and a colour guide.  Vicwest does not recommend making a purchase decision on colour selection without consulting with your Vicwest Representative and/or request a metal colour sample.

When stored outdoors, all product should be protected from exposure to direct sunlight using the original packaging or an opaque, light-colored tarp. Material that has been unwrapped should be covered and rewrapped.
WARNING: This product is combustible. A protective barrier or thermal barrier is required as specified in the appropriate building code. Protect it from exposure to open flame or other ignition sources during shipping, storage and installation.

GreenGuardTM Type 4 XPS Insulation Board is made of synthetic materials that are generally recognized as not providing a food source for insects, fungus, mold, or mildew. It should always be properly installed and stored.
GreenGuardTM Type 4 XPS Insulation Board is HCFC free.
This product should not be used as an exposed interior surface in buildings where people can be expected to be present. An approved fire protection barrier, such as 1/2” gypsum wallboard or equivalent, should be applied between this product and the interior of such buildings. Fire and building codes should be followed.
All assemblies should be evaluated for effectiveness and location of vapor retarders to avoid condensation and subsequent damage to structures (ASHRAE Handbook of Fundamentals). Since foam sheathings are non-structural, they must be installed over adequately braced framing in accordance with local building codes.

WARNING: Do not stand on or otherwise support your weight on this product unless it is fully supported by a load bearing surface.