Although SIPs are available with either a Polyurethane (PUR) foam core or Expaned Polystyrene (EPS) core, PUR foam is a far better insulator and offers the best physical properties of any available insulating foam.

R-VALUE: Polyurethane has a stable R-value of R-7 per inch of thickness, you can achieve R-25 with 4.5" walls.

FIRE:  SIPs are tested to the ASTM E84-04 “Standard Test Method for Surface Burning Characteristics of Building Materials” for smoke and flame spread. The polyurethane foam core has a Class 1 fire rating with a flame spread less than 25 units and smoke spread less than 400 units.

FOAM PROPERTIES:  Unlike some blowing agents, a number of which are scheduled for phase-out by the Environmental Protection Agency (EPA), PUR foam is not a volatile organic compound and, hence, does not contribute to ozone depletion.

Additional benefits of our polyurethane core include:

• Helps avoid mold and mildew growth 
• Does not support nesting by vermin 
• Contains no formaldehyde 
• Aids in maintaining indoor comfort level 
• Reduces materials needed for construction of energy-efficient buildings
• Reduces fuel consumption and infiltration of noise 
• Durable with excellent tensile strength and adhesion
• Provides consistent performance for the service life of the structure

Compared to other types of PUR, HFC-245fa polyurethane foam offers the best insulation and protection against moisture transport due to its density, cell structure, and good adhesion to skins.  We use HFC-245fa polyurethane foam in the manufacture of Greenix Panels.