{"product_id":"dupont-dow-styrofoam-xps-square-edge-extruded-polystyrene-foam-insulation-board-25-psi-1-3","title":"DuPont DOW Styrofoam XPS Square Edge Extruded Polystyrene Foam Insulation Board 25 psi, 1\"–3\" x 4 ft x 8 ft, Blue","description":"\u003ch1\u003eDuPont DOW Styrofoam XPS Square Edge Extruded Polystyrene Foam Insulation Board 25 psi, 1\"–3\" x 4 ft x 8 ft, Blue\u003c\/h1\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eDuPont DOW Styrofoam XPS Square Edge is an extruded polystyrene foam insulation board rated at 25 psi, supplied in 4 ft x 8 ft sheets in 1\", 2\", or 3\" thicknesses in blue. The page sells the full line of three thicknesses, each ordered by the piece or per MSF depending on size. Use it for continuous insulation over framing, in cavity walls, roofs, foundations, slabs, attics, and crawl spaces.\u003c\/strong\u003e\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eKey Features:\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eContinuous insulation:\u003c\/strong\u003e Provides continuous insulation over steel stud or wood framing, in masonry cavity walls, conventional roofs, and commercial foundation and floor slab applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy to cut:\u003c\/strong\u003e Boards are easy to handle and cut with a utility knife or serrated blade.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMoisture resistant:\u003c\/strong\u003e Offers superior resistance to water absorption, water vapor transmission, and freeze-thaw cycling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResidential and commercial:\u003c\/strong\u003e Suitable for attics, foundations, slabs, and crawl spaces in residential applications as well as commercial uses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable structures:\u003c\/strong\u003e Contributes to a more durable, sustainable structure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree thicknesses:\u003c\/strong\u003e Available in 1\", 2\", and 3\" thicknesses, each 4 ft x 8 ft and rated 25 psi.\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch2\u003eSpecifications Table:\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDuPont\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSell unit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1\" sold per MSF; 2\" and 3\" sold per piece (4 ft x 8 ft board)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct line\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDOW Styrofoam XPS Square Edge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eExtruded polystyrene (XPS) foam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlue\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompressive strength\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAvailable sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1\" x 4' x 8', 2\" x 4' x 8', 3\" x 4' x 8'\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBoard dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 ft x 8 ft sheets\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThickness options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 in., 2 in., 3 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEdge profile\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSquare edge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSell units\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1\" sells per MSF; 2\" and 3\" sell per piece\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplications\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eContinuous insulation over steel or wood framing, masonry cavity walls, conventional roofs, foundations, floor slabs, attics, crawl spaces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCutting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUtility knife or serrated blade\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003chr\u003e\u003ch2\u003eCoverage \u0026amp; How Much You Need:\u003c\/h2\u003e\u003cp\u003eEach 4 ft x 8 ft board covers 32 sq ft of wall, roof, or slab area at the selected thickness. Multiply the wall or roof square footage by 1.05–1.10 for waste and divide by 32 to order the right number of boards.\u003c\/p\u003e\u003ch2\u003eFit and Compatibility:\u003c\/h2\u003e\u003cp\u003eUse under any exterior cladding or roofing assembly that calls for continuous XPS insulation, including steel- or wood-framed walls, masonry cavity walls, conventional roofs, and below-grade foundation or slab applications. Tape, flashing, and fastening accessories are sold separately.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eFrequently Asked Questions (FAQ):\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eQ: What is included in one order?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e One sell unit of the selected variant: the 1\" board is sold per MSF, while the 2\" and 3\" boards are sold per piece.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: How much area does one board cover?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e A 4 ft x 8 ft board covers 32 square feet at the chosen thickness.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: How do I cut the boards?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The manufacturer states the boards cut easily with a utility knife or serrated blade.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: Where can this insulation be used?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Over steel or wood framing, in masonry cavity walls, conventional roofs, commercial foundations and floor slabs, plus residential attics, foundations, slabs, and crawl spaces.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: Is it moisture resistant?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, DuPont states superior resistance to water absorption, water vapor transmission, and freeze-thaw cycling.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: Which thickness should I choose?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e All three sizes share the same 25 psi rating and blue XPS construction, so select thickness based on the R-value or insulation depth your project specifies.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eExpert Verdict — Reviewed by the SuperArbor Pro Desk\u003c\/h2\u003e\u003cp\u003eXPS square-edge board is the go-to choice for continuous exterior insulation because it combines high compressive strength (25 psi here) with low water absorption, making it suitable for both above-grade walls and below-grade slabs. Stagger board joints and tape or seal seams for a continuous thermal layer. Choose 2\" or 3\" when the project calls for higher R-value per layer; 1\" works well for cavity drainage gaps and shallow assemblies.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eCut foam boards with a sharp blade on a flat, stable surface and keep ignition sources away from exposed foam insulation.\u003c\/em\u003e\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eOrder DuPont DOW Styrofoam XPS Square Edge insulation boards in 1\", 2\", or 3\" thicknesses for your next continuous-insulation project.\u003c\/strong\u003e\u003c\/p\u003e","brand":"DuPont","offers":[{"title":"Default Title","offer_id":53522931253615,"sku":"DOW1603","price":99.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0830\/3499\/7051\/files\/ProductImage_DOW1603_1a5e0914-517e-434d-bb00-d702c579f9b1.jpg?v=1790234168","url":"https:\/\/superarbor.io\/products\/dupont-dow-styrofoam-xps-square-edge-extruded-polystyrene-foam-insulation-board-25-psi-1-3","provider":"Super Arbor","version":"1.0","type":"link"}