{"product_id":"1631232-owens-corningr-foamularr-r-1-extruded-polystyrene-foam-fanfold-underlayment-insulation-1-4-x-4-x-50-square-edge","title":"Owens Corning FOAMULAR R-1 Extruded Polystyrene Fanfold Underlayment Insulation, 1\/4 in. x 4 ft. x 50 ft., Square Edge","description":"\u003ch1\u003eFOAMULAR R-1 1\/4 in. Fanfold XPS Underlayment\u003c\/h1\u003e\n    \u003cp\u003e\u003cstrong\u003eLightweight, moisture-resistant XPS fanfold underlayment designed for re-siding and sheathing applications. The 1\/4 in. thick, 4 ft. x 50 ft. board delivers R-1 thermal performance and folds for fast coverage and easy handling.\u003c\/strong\u003e\u003c\/p\u003e\n    \u003chr\u003e\n    \u003ch2\u003eKey Features:\u003c\/h2\u003e\n    \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eMoisture-Resistant XPS:\u003c\/strong\u003e Retains R-value even after exposure to water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy Handling \u0026amp; Install:\u003c\/strong\u003e Fanfold design cuts and scores simply; no special tools required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRe-Siding Ready:\u003c\/strong\u003e Ideal as underlayment\/sheathing for re-siding projects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Performance:\u003c\/strong\u003e Strong, lightweight board with long-term thermal retention.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-Emitting \u0026amp; Certified:\u003c\/strong\u003e GREENGUARD certified; formaldehyde-free blowing agent with reduced GWP.\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \u003cp\u003e\u003cstrong\u003ePlease check the Product Data Sheet \u003ca href=\"https:\/\/superarbor.io\/cdn\/shop\/files\/8377019b-ec44-4e83-bf5f-58ac4922f310.pdf?v=1763102207\" target=\"_blank\"\u003e\u003cspan style=\"color: rgb(255, 128, 0);\"\u003eHere\u003c\/span\u003e\u003c\/a\u003e\u003c\/strong\u003e\u003c\/p\u003e\n    \u003chr\u003e\n    \u003ch2\u003eSpecifications Table:\u003c\/h2\u003e\n    \u003ctable\u003e\n        \u003cthead\u003e\n            \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\n        \u003c\/thead\u003e\n        \u003ctbody\u003e\n            \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInsulation Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFoam Board Insulation (XPS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInsulation R-Value\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eR-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThickness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.25 in (1\/4 in.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWidth\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e48 in. (4 ft.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLength\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e50 ft.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoverage Area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e200 sq. ft.\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\u003eFaced or Unfaced\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnfaced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Install Surface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eConcrete, Plywood, Wood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInterior\/Exterior\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eInterior; commonly used for re-siding underlayment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNumber of Pieces\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePack Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e13.2 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSheathing Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eXPS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInsulation Features\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFormaldehyde Free; GREENGUARD Certified; Low water absorption; High R-value retention\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLimited Lifetime\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003c\/tbody\u003e\n    \u003c\/table\u003e\n    \u003chr\u003e\n    \u003ch2\u003eFrequently Asked Questions (FAQ):\u003c\/h2\u003e\n    \n    \u003cp\u003e\u003cstrong\u003eQ: What are the dimensions and coverage?\u003c\/strong\u003e\u003cbr\u003e\n    \u003cstrong\u003eA:\u003c\/strong\u003e Each fanfold measures 1\/4 in. thick, 4 ft. wide, and 50 ft. long, covering 200 sq. ft.\u003c\/p\u003e\n    \u003chr\u003e\n    \n    \u003cp\u003e\u003cstrong\u003eQ: Where can I use this product?\u003c\/strong\u003e\u003cbr\u003e\n    \u003cstrong\u003eA:\u003c\/strong\u003e Commonly used as re-siding underlayment or insulating sheathing over wood, plywood, or concrete surfaces.\u003c\/p\u003e\n    \u003chr\u003e\n    \n    \u003cp\u003e\u003cstrong\u003eQ: Is it faced?\u003c\/strong\u003e\u003cbr\u003e\n    \u003cstrong\u003eA:\u003c\/strong\u003e No, this product is unfaced XPS foam board.\u003c\/p\u003e\n    \u003chr\u003e\n    \n    \u003cp\u003e\u003cstrong\u003eQ: How moisture resistant is it?\u003c\/strong\u003e\u003cbr\u003e\n    \u003cstrong\u003eA:\u003c\/strong\u003e XPS construction provides low water absorption to help maintain R-value in wet conditions.\u003c\/p\u003e\n    \u003chr\u003e\n    \n    \u003cp\u003e\u003cstrong\u003eQ: Do I need special tools to install?\u003c\/strong\u003e\u003cbr\u003e\n    \u003cstrong\u003eA:\u003c\/strong\u003e No. It scores, snaps, and cuts easily with standard utility knives.\u003c\/p\u003e\n    \u003chr\u003e\n    \n    \u003ch2\u003eStreamlined Sheathing with a Sleek, Modern Edge\u003c\/h2\u003e\n    \u003cp\u003eThis fanfold insulation creates a crisp, continuous plane behind new siding, elevating exteriors with a polished, tailored finish. I love its subtle flexibility—the panels fold effortlessly to glide across large walls, minimizing seams and visual clutter. Pair it with fiber-cement or cedar cladding to achieve a refined envelope and improved comfort. It’s a quiet luxury—performance you feel, with a look that’s impeccably composed.\u003c\/p\u003e\n    \n    \u003chr\u003e\n    \u003cp\u003e\u003cstrong\u003eUpgrade your re-siding project with FOAMULAR fanfold insulation for faster installs, lasting R-value, and a cleaner finish—add it to your cart today.\u003c\/strong\u003e\u003c\/p\u003e\n    \n    \u003cp\u003e\u003ca href=\"https:\/\/superarbor.io\/cdn\/shop\/files\/b3751e9e-d59b-44e0-9cfc-ac0cc46a1035.pdf?v=1763102205\" target=\"_blank\"\u003eInstallation\u003c\/a\u003e\u003c\/p\u003e","brand":"Owens Corning","offers":[{"title":"Default Title","offer_id":48991785156822,"sku":"21UM","price":70.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0778\/5244\/2838\/files\/owens-corning-foam-board-insulation-21um-64_1000.jpg?v=1783638028","url":"https:\/\/waybilt.com\/products\/1631232-owens-corningr-foamularr-r-1-extruded-polystyrene-foam-fanfold-underlayment-insulation-1-4-x-4-x-50-square-edge","provider":"Buildsupply","version":"1.0","type":"link"}