{"product_id":"gmc-roofing-building-30-astm-shakefelt-steep-slope-roofing-underlayment-roll","title":"GMC Roofing \u0026 Building #30 ASTM Shakefelt Steep Slope Roofing Underlayment, Roll","description":"\u003ch1\u003eGMC Roofing \u0026amp; Building #30 ASTM Shakefelt Steep Slope Roofing Underlayment, Roll\u003c\/h1\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eGMC Roofing \u0026amp; Building #30 ASTM 22\" Shakefelt is a 30-pound ASTM-compliant felt underlayment for steep slope roofs, sold by the roll. Install it over the roof deck beneath shingles or other steep slope coverings. Use with appropriate fasteners and laps per the covering manufacturer's specifications.\u003c\/strong\u003e\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eKey Features:\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo. 30 felt:\u003c\/strong\u003e A 30-pound class felt underlayment for steep slope roofing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eASTM compliance:\u003c\/strong\u003e Manufactured as #30 ASTM felt.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e22 in. Shakefelt:\u003c\/strong\u003e Offered as 22-inch Shakefelt.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoll format:\u003c\/strong\u003e Supplied by the roll for convenient handling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteep slope use:\u003c\/strong\u003e Intended for use as steep slope roofing underlayment.\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\u003eSell unit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 roll\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct line\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e#30 ASTM Shakefelt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAvailable colors\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e['22\" Shakefelt']\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAvailable sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e['#30 ASTM 22\" Shakefelt roll']\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSteep slope roofing underlayment\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\u003eExact roll dimensions and coverage are not stated in the available sources. Standard #30 felt rolls are commonly sized for use beneath shingles with side laps; confirm coverage from the roll label before ordering.\u003c\/p\u003e\u003ch2\u003eFit and Compatibility:\u003c\/h2\u003e\u003cp\u003eDesigned for use beneath asphalt shingles and other steep slope roof coverings over an approved deck. Cap nails or cap staples and any 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 my order?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e One roll of GMC Roofing \u0026amp; Building #30 ASTM 22\" Shakefelt underlayment.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: How do I size my order?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Estimate roof area, allow for side and end laps, and order rolls based on the coverage printed on the roll.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: What fasteners should I use?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Fasten with roofing nails, cap nails or cap staples per the shingle manufacturer's underlayment requirements.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: Does this meet ASTM standards?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e It is designated as #30 ASTM felt, per the product listing.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eExpert Verdict — Reviewed by the SuperArbor Pro Desk\u003c\/h2\u003e\u003cp\u003eNo. 30 ASTM felt is the traditional choice for steep slope shingle underlayment, offering heavier weight and better tear resistance than No. 15. Keep laps consistent and follow the covering manufacturer's nailing pattern. In high-wind zones, consider specifying the fastening method required by local code.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eRoofing underlayment surfaces are slippery; use fall protection and install from ladders or roof brackets safely secured to the structure.\u003c\/em\u003e\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eOrder GMC Roofing \u0026amp; Building #30 ASTM Shakefelt underlayment rolls for your next shingle roof.\u003c\/strong\u003e\u003c\/p\u003e","brand":"GMC Roofing \u0026 Building","offers":[{"title":"Default Title","offer_id":53531869577583,"sku":"05MIG30A22","price":60.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0830\/3499\/7051\/files\/Underlayment-Mineral-Surface-SKU_2271563-primary.jpg?v=1790369505","url":"https:\/\/superarbor.io\/products\/gmc-roofing-building-30-astm-shakefelt-steep-slope-roofing-underlayment-roll","provider":"Super Arbor","version":"1.0","type":"link"}