INSUL-DRAIN® Extruded Polystyrene (XPS) Insulation Board

ASTM C578 Type IV, 25 psi, 1.55 pcf density

Foamular Insul-Drain

INSUL-DRAIN® is a FOAMULAR® extruded polystyrene product that incorporates the features of insulation, drainage and protection board in a single product. It’s easy to install, without the need for special tools or equipment, and the product’s compressive strength and long-term moisture resistance properties mean years of reliable performance on below grade foundation walls even under extremely harsh conditions. Some of the main characteristics of FOAMULAR® INSUL-DRAIN® extruded polystyrene insulation are:

  • Precision-cut channels drain water from vertical foundation walls while completing total insulation envelope.
  • Durable filtration fabric prevents soil from clogging channels.
  • 48" x 84" and 48" x 96" sizes cover more square footage faster and minimizes joints between boards.
  • Acts as protection course for waterproofing membrane.
  • Tongue & groove edges provide proper board alignment and helps seal joints.
  • Top-edge horizontal channel permits unobstructed water flow between vertical courses of boards.
  • High R-value, exceptional moisture resistance and high compressive strength of FOAMULAR® extruded polystyrene insulation.
  • UL Classified foam core meets ASTM C578 Type IV specifications.

Owens Corning’s FOAMULAR® extruded polystyrene insulation is an ENERGY STAR® qualified product.

Thickness Width / Length Edge Type
1½", 2¼" 4' x 8' Tongue & Groove
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Other sizes/edge configurations may be available with minimum order.

We recommend INSUL-DRAIN® Extruded Polystyrene (XPS) Insulation Board for the following applications:


Product Overview