Foam-Control PLUS+®
Perimeter & Underslab Insulation

Foam-Control PLUS+® is an architectural insulation product line with high compressive strength and R-value. Foam-Control PLUS+® is a premium grade insulation manufactured to provide architects, specifiers, distributors, and contractors all the features and benefits inherent in a high quality insulation.

Other Foam-Control® Plus+® Applications


  • Strength – Foam-Control PLUS+® comes in high compressive strengths of 15, 25, 40, and 60 psi.
  • Stable R-value – Foam-Control PLUS+® has a high R-value that never changes and is stable over time.
  • Moisture Resistance – Foam-Control PLUS+® is a closed cell polystyrene insulation and is resistant to moisture gain.
  • Vapor Permeable – Foam-Control PLUS+® allows moisture vapor to move through its structure.
  • Drying Potential – Foam-Control PLUS+® rapidly releases absorbed moisture.
The stable R-value, Vapor Permeability, and Drying Potential of Foam-Control PLUS+® make it an architectural insulation like no other.  


Strength¹, psi


75º F

40º F

Plus+ 150 15 4.2 4.6
Plus+ 250 25 4.4 4.8
Plus+ 400 40 4.4 4.8
Plus+ 600 60 4.5 4.9
¹Compressive strength @10% deformation.
²R-Value and thicknesses to meet your needs.

Moisture Resistance

The impact of moisture gain and lass on the performance of polystyrene foam insulation in below-grade applications is an important consideration.  Any change in R-value as a result of water gain and loss should be accounted for in the design of below-grade applications.

Samples of EPS and XPS were excavated from the exterior foundation of a building in St. Paul, MN.  The insulation was placed into service in 1993 and had 15 years of use as a vertical wall insualtion separating a heated building from soil.

Moisture Content¹, volume %

Sample Upon Removal


EPS 4.8 0.7
XPS 18.9 15.7
¹Please refer to Moisture Study 101.
²After four weeks in a laboratory at 72º F, 50% RF.

Drying Potential

Foam-Control PLUS+® is manufactured to resist moisture absorption in wetting conditions and release absorbed moisture quickly during drying periods, which means Foam-Control PLUS+® maintains R-value.

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