{"product_id":"gmc-gmc30astmd226-gmc-39-25-in-30-felt-underlayment-astm-d-226-2-square-roll","title":"GMC 39.25 in. 30# Felt Underlayment, ASTM D-226, 2 Square Roll","description":"\u003ch1\u003eGMC 39.25 in. 30# Felt Underlayment, ASTM D-226, 2 Square Roll\u003c\/h1\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eGMC 30# organic felt underlayment is a 39.25 in. wide roll covering 2 squares (216 sq ft), meeting ASTM D 226-05 Type II and ASTM D 4869-05 Type IV. Each order is one roll weighing about 18 lb. Use it as asphalt-shingle underlayment beneath shingle courses.\u003c\/strong\u003e\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eKey Features:\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets ASTM D 226:\u003c\/strong\u003e Conforms to ASTM D 226-05 Type II specification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eASTM D 4869 Type IV:\u003c\/strong\u003e Also meets ASTM D 4869-05 Type IV requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2 square roll:\u003c\/strong\u003e Covers 216 sq ft per roll for efficient estimation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e39.25 in. width:\u003c\/strong\u003e Wide format reduces the number of courses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUL listed accessory:\u003c\/strong\u003e Meets UL Specifications for Prepared Roofing Accessory as printed.\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\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, 39.25 in. x 2 squares (216 sq 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\u003e30# Felt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e39.25 in. wide roll\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\u003e216 sq ft (2 squares)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30# organic felt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApprovals\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eASTM D 226-05 Type II; ASTM D 4869-05 Type IV; UL Specifications for Prepared Roofing Accessory\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e18 lb per 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\u003eAsphalt shingle roof 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\u003eOne roll covers 2 squares, 216 sq ft, at nominal 39.25 in. width. Effective coverage is slightly less after laps; calculate rolls as roof squares divided by 2, then add 10-15% for lap and waste per manufacturer instructions and local code.\u003c\/p\u003e\u003ch2\u003eFit and Compatibility:\u003c\/h2\u003e\u003cp\u003eUsed beneath asphalt shingles and as a general-purpose roofing underlayment. Shingle starter course, fasteners and cap nails are sold separately. Verify that the shingle manufacturer approves organic felt underlayment for the warranty.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eFrequently Asked Questions (FAQ):\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eQ: How much area does one roll cover?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e One roll covers 216 sq ft, or 2 squares, before lap deductions.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: What standards does it meet?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e ASTM D 226-05 Type II, ASTM D 4869-05 Type IV, and UL Specifications for Prepared Roofing Accessory.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: How wide is the roll?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The roll is 39.25 in. wide.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: How much does a roll weigh?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Approximately 18 lb per 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 Use cap nails or cap staples per the underlayment and shingle manufacturer's instructions; fasteners are sold separately.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eExpert Verdict — Reviewed by the SuperArbor Pro Desk\u003c\/h2\u003e\u003cp\u003eThirty-pound felt is a common choice for code-minimum shingle underlayment; order about half as many rolls as roof squares plus waste allowance. Lap horizontal courses 2-4 in. and end laps per the manufacturer's instructions and local code. In high-wind regions, check whether the shingle manufacturer requires a synthetic underlayment instead.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eFelt underlayment is slippery, especially on slopes or when wet; wear soft-soled slip-resistant footwear and use proper fall protection.\u003c\/em\u003e\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eOrder the GMC 30# ASTM D-226 felt underlayment roll for your next shingle roof.\u003c\/strong\u003e\u003c\/p\u003e","brand":"GMC","offers":[{"title":"Default Title","offer_id":53529526698351,"sku":"GMC30ASTMD226","price":41.11,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0830\/3499\/7051\/files\/492584_default_hero.jpg?v=1790350935","url":"https:\/\/superarbor.io\/products\/gmc-gmc30astmd226-gmc-39-25-in-30-felt-underlayment-astm-d-226-2-square-roll","provider":"Super Arbor","version":"1.0","type":"link"}