{"product_id":"gmc-roofing-building-gmc-15-astm-felt-underlayment","title":"GMC Roofing \u0026 Building 15# ASTM Felt Roofing Underlayment Roll – 015-D226-GMC","description":"\u003ch1\u003eGMC Roofing \u0026amp; Building 15# ASTM Felt Roofing Underlayment Roll\u003c\/h1\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eThis is a GMC Roofing \u0026amp; Building 15# asphalt-saturated felt roofing underlayment manufactured to ASTM standards. It installs beneath shingles and other roof coverings as a secondary water-shedding layer. One unit is a single roll of felt underlayment.\u003c\/strong\u003e\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eKey Features:\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e15# felt:\u003c\/strong\u003e No. 15 weight asphalt-saturated felt underlayment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eASTM standard:\u003c\/strong\u003e Manufactured to an ASTM standard per the product title.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecondary protection:\u003c\/strong\u003e Installed under roof coverings as a secondary water-shedding layer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoll format:\u003c\/strong\u003e Supplied in a roll for fast unrolling across the roof deck.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoofing underlayment:\u003c\/strong\u003e Designed for use beneath shingle and other sloped roof coverings.\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\u003eGMC Roofing \u0026amp; Building\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e015-D226-GMC\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 of felt underlayment\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 felt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight class\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15# (No. 15)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStandard\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eASTM (per product title)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIntended use\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRoofing underlayment beneath shingles and other roof coverings\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\u003eCoverage per roll depends on the roll's width and length, which were not provided in the sources; size your job by dividing the roof deck area by the per-roll coverage once the roll dimensions are confirmed.\u003c\/p\u003e\u003ch2\u003eFit and Compatibility:\u003c\/h2\u003e\u003cp\u003eInstalled over the roof deck and beneath asphalt shingles or other sloped roof coverings. Starter shingles, ridge caps 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 in one unit?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e One roll of 15# ASTM felt underlayment; fasteners and roof coverings are not included.\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 Roll dimensions were not provided in the sources; confirm roll width and length to calculate coverage.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: Where does this go in the roof system?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e It installs on the roof deck, beneath the shingles or other finished roof covering.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: What does 15# mean?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e 15# refers to the No. 15 weight class of asphalt-saturated felt underlayment.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: Which ASTM standard applies?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The title states the felt is manufactured to an ASTM standard, but the specific standard number was not provided in the sources.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eExpert Verdict — Reviewed by the SuperArbor Pro Desk\u003c\/h2\u003e\u003cp\u003eNo. 15 felt is the traditional choice for standard sloped shingle roofs; run it horizontally from the eaves up with proper laps, and use ice-and-water membrane at eaves and valleys where required by code. Keep rolls dry and flat before installation, and avoid working the felt when wet or windy. For low-slope or high-exposure roofs, consider a heavier or synthetic underlayment instead.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eUse roof anchors, fall protection and slip-resistant footwear when installing underlayment, as felt surfaces are slippery especially when wet or dusty.\u003c\/em\u003e\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eOrder the GMC Roofing \u0026amp; Building 15# ASTM felt underlayment roll for dependable protection under your shingles.\u003c\/strong\u003e\u003c\/p\u003e","brand":"GMC Roofing \u0026 Building","offers":[{"title":"Default Title","offer_id":53396056408431,"sku":"05MIG15AS","price":53.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0830\/3499\/7051\/files\/ABC-Underlayment-Mineral-Surface-05MIG15AS-primary.jpg?v=1789846323","url":"https:\/\/superarbor.io\/products\/gmc-roofing-building-gmc-15-astm-felt-underlayment","provider":"Super Arbor","version":"1.0","type":"link"}