DuPont™ Tongue and Groove Foam Insulation, 4 x 8 ft, 1 in, R 5.0, Full Truckload

Minimum order quantity must be a full truck (12 bundles). Lead Time: Estimated 12 Weeks. To Order Call 888-223-3050
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DuPont™ STYROFOAM™ Tongue and Groove Insulation Board (Blue Board) 4 ft by 8 ft Sheet,  1" Thick, R value 5.0

A nonstructural, rigid board insulation manufactured of Extruded Polystyrene Foam (XPS). It features a tongue and groove edge on the long edges to ensure a tight fit with the adjacent board. Suitable for a wide range of residential and commercial construction applications DuPont™ STYROFOAM™ Tongue and Groove Insulation Board enhances energy efficiency, and reduces condensation. By covering existing wood framing, and cavity areas Blue Board gives you a continuous insulation barrier that can increase effective R-value by up to 20%.   Blue Board's closed cell structure resists moisture penetration and protects underlying materials from water damage. When used in combination with construction tape and Great Stuff sealants DuPont™ STYROFOAM™ insulation board becomes an effective barrier against air leakage and infiltration.


Blue Board Specifications:

  • Thickness: 1.0 inch
  • Sheet Size: 4' x 8'
  • R Value: 5.0
  • Edge Shape: Tongue & Groove

Using Blue Board

Instructions for Use:

Fasten Boards using nails, screws or staples with large diameter heads or washers; make sure to allow 3/4" to 1" penetration into substrate. Suggested fastener spacing is 12" oc along perimeter and 16" oc within the board. DuPont™ suggests installing 4' x 8' insulation sheets vertically and 2' x 8' insulation sheets horizontally. Once Panels are fastened, seal exterior openings using Great Stuff Enerfoam and use Weathermate Construction Tape to cover seams to reduce air infiltration.  

DuPont™ STYROFOAM™ Insulation meets IBC/IRC  requirements for foam plastic insulation. See ICC-ES ESR-2142. UL Classified, see Classification Certificate D369. DuPont™ STYROFOAM™ Insulation is combustible: Protect from high heat sources. Local building codes may require a protective or thermal barrier.



  • Shipment consists of multiple bundles. Bundles are 48" w x 96" l x 96" h and contain 96 sheets each.
  • Receiver must be prepared to unload bundles from truck.

Shipping Costs:

  • $375.00 Full Truck

Prices are for a single truckload delivery.

Additional Sizes

Additional Sizes of Blue Board:

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