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FOAMULAR® INSUL-DRAIN® 2.25 in x 4 ft x 8 ft R-10.6 Tongue & Groove Edge Insulation Sheathing


As low as $184.27/board

Superior insulation performance for a wide variety of building requirements. FOAMULAR® INSUL-DRAIN® XPS insulation can be used for:

  • Drainage specifically for foundations to improve thermal foundation performance through a higher R-value.
Pricing Breakdown:
Quantity: Price Per:
1 – 41 $196.45
42+ $184.27

Additional Information


2.25 in


4 ft


8 ft

Edge Type

Tongue & Groove

Minimum Compressive Strength (psi)


R Value

R 10.6





ASTM C578 Type


Product Description


2.25 in. x 4 ft. x 8 ft. R-10.6 Tongue & Groove Edge Insulation Sheathing

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. Learn more about rigid insulation R values


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