{"product_id":"kingspan-greenguard-q250-1-4-in-x-4-ft-x-48-ft-fanfold-siding-underlayment-white","title":"Kingspan GreenGuard Q250 1\/4 in. x 4 ft x 48 ft Fanfold Siding Underlayment, White","description":"\u003ch1\u003eKingspan GreenGuard Q250 1\/4 in. x 4 ft x 48 ft Fanfold Siding Underlayment, White\u003c\/h1\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eKingspan GreenGuard Q250 is the most economical fanfold siding underlayment in the GreenGuard line: a 0.2 in. extruded polystyrene foam board with high-impact polystyrene facers on both sides. Each 4 ft x 48 ft fanfold board covers about 192 square feet and provides a smooth, level nailing surface for new siding. Perforations allow moisture vapor to escape.\u003c\/strong\u003e\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eKey Features:\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEconomical insulation:\u003c\/strong\u003e The most economical fanfold siding underlayment in the GreenGuard line.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable XPS core:\u003c\/strong\u003e 0.2 in. extruded polystyrene foam core with high-impact polystyrene facers on both sides for durability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVapor permeable:\u003c\/strong\u003e Perforated to allow moisture vapor to escape from the wall assembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmooth nailing base:\u003c\/strong\u003e Provides a smooth, level nailing surface for new siding.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy to handle:\u003c\/strong\u003e Lightweight, durable, and cuts clean and easy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFanfold format:\u003c\/strong\u003e 4 ft x 48 ft fanfold board unfolds quickly along the wall.\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\u003eKingspan\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 board, 1\/4 in. x 4 ft x 48 ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct line\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGreenGuard Q250\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 foam (XPS) core with high-impact polystyrene facers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColor \/ finish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWhite\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThickness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1\/4 in. (0.2 in.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1\/4 in. x 4 ft x 48 ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoverage per unit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApproximately 192 sq ft per board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFinish \/ texture\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePerforated fanfold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIntended use\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFanfold underlayment beneath new siding\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\u003eOne 4 ft x 48 ft board unfolds to cover roughly 192 square feet of wall area. Measure the wall square footage and divide by 192, adding a little for laps and cut waste around windows and doors.\u003c\/p\u003e\u003ch2\u003eFit and Compatibility:\u003c\/h2\u003e\u003cp\u003eInstall under vinyl, wood, fiber cement or composite siding as a leveling and nailing base. Siding, starter strips and fasteners are sold separately.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eFrequently Asked Questions (FAQ):\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eQ: What is included?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e One 1\/4 in. x 4 ft x 48 ft white fanfold underlayment board, sold per board.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: How much does one board cover?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e A 4 ft x 48 ft fanfold board covers approximately 192 square feet before cut waste.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: Is it perforated?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, Q250 is perforated to allow moisture vapor to escape.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: Why use fanfold underlayment?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e It provides a smooth, level nailing surface for new siding over existing walls.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: How thick is it?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e 0.2 in., commonly called 1\/4 in.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eExpert Verdict — Reviewed by the SuperArbor Pro Desk\u003c\/h2\u003e\u003cp\u003eFanfold underlayment is the fast, economical way to flatten an existing wall before residing: butt boards tightly, stagger vertical joints and fasten on the stud line per the siding manufacturer's requirements. The perforations help the wall dry, so do not substitute a non-perforated board where vapor escape matters. On badly bowed walls, consider a thicker fanfold grade instead of the 1\/4 in. Q250.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eWear eye protection and cut with a sharp utility knife on a flat surface, keeping hands clear of the blade.\u003c\/em\u003e\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eGet Kingspan GreenGuard Q250 fanfold underlayment now for a smooth, level base under your new siding.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Kingspan","offers":[{"title":"Default Title","offer_id":67583380783471,"sku":"PACTI","price":59.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0830\/3499\/7051\/files\/ProductImage_PACFF1448.jpg?v=1790407004","url":"https:\/\/superarbor.io\/products\/kingspan-greenguard-q250-1-4-in-x-4-ft-x-48-ft-fanfold-siding-underlayment-white","provider":"Super Arbor","version":"1.0","type":"link"}