{"product_id":"g-a-p-15-asphalt-felt-roofing-underlayment-astm-d226-4-squares-per-roll","title":"G.A.P. 15# Asphalt Felt Roofing Underlayment, ASTM D226, 4 Squares per Roll","description":"\u003ch1\u003eG.A.P. 15# Asphalt Felt Roofing Underlayment, ASTM D226, 4 Squares per Roll\u003c\/h1\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eG.A.P. 15# Felt is an organic asphalt-saturated felt underlayment applied over the roof deck before asphalt shingles are installed. Each roll covers approximately 4 squares and meets ASTM D226. It is recommended for use under 20-year asphalt shingles.\u003c\/strong\u003e\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eKey Features:\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeck Protection:\u003c\/strong\u003e Applied over the roofing deck before shingle installation to provide a secondary layer of protection under asphalt shingles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eASTM D226:\u003c\/strong\u003e Manufactured to meet ASTM D226, the standard specification for asphalt-saturated organic felt underlayment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 Squares per Roll:\u003c\/strong\u003e Each roll is sized at 4 squares, covering roughly 400 sq. ft. of roof deck.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShingle Pairing:\u003c\/strong\u003e Recommended for use with 20-year asphalt shingles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProven Material:\u003c\/strong\u003e Traditional 15-pound felt remains a widely used, economical underlayment choice for residential roofing.\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\u003eG.A.P.\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 roll, 4 squares\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct line\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eG.A.P. Felt 15#\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAsphalt-saturated organic felt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15# (15-pound) felt\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\u003e4 squares per roll (approx. 400 sq. ft.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApprovals\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eASTM D226\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 Square\/Roll\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIntended use\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnderlayment beneath asphalt shingles on residential roofs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAvailable sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 Square\/Roll\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 roll covers 4 squares, or about 400 sq. ft. of roof deck. Estimate rolls by dividing total roof area in squares by 4 and adding extra for laps at eaves, ridges and overlaps.\u003c\/p\u003e\u003ch2\u003eFit and Compatibility:\u003c\/h2\u003e\u003cp\u003eDesigned for use under asphalt shingles, particularly 20-year grade shingles, and is installed over the roof deck prior to shingle application. Shingles, fasteners and drip edge are sold separately.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eFrequently Asked Questions (FAQ):\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eQ: What is included with one order?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e One roll of G.A.P. 15# felt underlayment, sized at 4 squares per roll and meeting ASTM D226.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: How much area does a roll cover?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Each roll covers approximately 4 squares (400 sq. ft.) of roof deck; plan for overlap at laps when estimating.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: When is this felt installed?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e It is applied over the roofing deck before installation of asphalt shingles.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: Is it rated to a standard?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, this felt is produced to ASTM D226.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: What shingles does it pair with?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e It is recommended for use with 20-year asphalt shingles.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eExpert Verdict — Reviewed by the SuperArbor Pro Desk\u003c\/h2\u003e\u003cp\u003eFifteen-pound felt is the workhorse underlayment for standard-duration asphalt shingle roofs. Deck it out dry and lap horizontal courses at least 2 in. with 4 in. at end laps, and install it the same day you shingle where possible to limit exposure. For premium or long-duration shingle systems, consider a synthetic underlayment instead.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eFelt underlayment becomes slippery, especially when wet or dusty — wear fall protection and appropriate footwear when working on the roof.\u003c\/em\u003e\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eOrder G.A.P. 15# Felt Underlayment today and give your shingle roof a proven deck-level layer of protection.\u003c\/strong\u003e\u003c\/p\u003e","brand":"G.A.P.","offers":[{"title":"Default Title","offer_id":53524016103791,"sku":"GAP15FD266","price":44.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0830\/3499\/7051\/files\/ProductImage_GAP15FD266.jpg?v=1790270425","url":"https:\/\/superarbor.io\/products\/g-a-p-15-asphalt-felt-roofing-underlayment-astm-d226-4-squares-per-roll","provider":"Super Arbor","version":"1.0","type":"link"}