{"product_id":"sipa-100-gsm-synthetic-waterproof-roof-underlayment-48-x-250-ft","title":"SIPA 100 GSM Synthetic Waterproof Roof Underlayment 48 x 250 ft","description":"\u003cp\u003eOur review of the SIPA 100 GSM Synthetic Roofing Underlayment finds it best suited to contractors and experienced DIYers who need a lightweight, water resistant underlayer for sloped commercial or residential roofs. The single biggest reason to consider this product is its combination of a non-woven top surface for traction and a waterproof coil layer that claims extended UV resistance, which makes it practical when re-roofing or installing metal cladding under conditions where temporary exposure may occur. Installation notes and real-world feedback are mixed on adhesive performance, but performance specifications and approvals make it a credible underlayment choice.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e10 square roll:\u003c\/strong\u003e Each roll covers 1,000 sq ft, letting installers calculate material needs quickly and reduce seams on larger roofs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100 GSM weight:\u003c\/strong\u003e The lightweight synthetic fabric is easier to handle than heavy felt, which can speed up installation on steep slopes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced traction top surface:\u003c\/strong\u003e The unique non-woven top fabric helps maintain secure footing for roofers during installation and in wet conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater resistant coil layer:\u003c\/strong\u003e A waterproof and anti-aging coil layer provides a double waterproof barrier under shingles or metal cladding.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCode approvals and UV exposure:\u003c\/strong\u003e Meets or exceeds ASTM standards and is TDI Listed CCRR #AC207 and FBC Approved #FL17188 with up to 60 days ultraviolet exposure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStable material:\u003c\/strong\u003e Designed not to buckle, warp, or crack, which preserves the underlayment integrity during installation and weather cycles.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis underlayment is aimed at roofing contractors and homeowners doing major roof projects on sloped residential and commercial roofs who need a tested synthetic product with recognized approvals. It is particularly useful when installers want a light, traction-friendly sheet that can tolerate limited ultraviolet exposure before final roofing is applied.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere include users needing an underlayment with factory-applied adhesive in every application or projects requiring a heavy, self-adhering ice-and-water product; customer feedback indicates adhesive strength can be mixed, so jobs that demand permanent self-stick performance in all conditions might favor alternative products.\u003c\/p\u003e\n\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLightweight 100 GSM construction makes handling and layout faster on large roof areas.\u003c\/li\u003e\n\u003cli\u003eNon-woven top surface offers improved traction and reduced slip risk during installation.\u003c\/li\u003e\n\u003cli\u003eMeets multiple standards and approvals, including ASTM performance levels and TDI\/FBC listings, which supports code compliance.\u003c\/li\u003e\n\u003cli\u003eWater resistant coil and anti-aging layers provide double waterproofing under shingles or metal cladding.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSome customers report mixed durability and that adhesive strength is not consistent, so additional fastening or seam treatment may be required.\u003c\/li\u003e\n\u003cli\u003eNot a substitute for dedicated self-adhering ice-and-water membranes where full adhesion is required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSIPA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e100 GSM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRoll Size\u003c\/td\u003e\n\u003ctd\u003e48 in x 250 ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoverage per Roll\u003c\/td\u003e\n\u003ctd\u003e10 square (1,000 sq ft)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApprovals\u003c\/td\u003e\n\u003ctd\u003eTDI Listed CCRR #AC207; FBC Approved #FL17188\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUV Exposure\u003c\/td\u003e\n\u003ctd\u003eUp to 60 days\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe SIPA 100 GSM Synthetic Underlayment is a practical, code-friendly choice for roofers and experienced homeowners who need a lightweight, water resistant underlayer with good traction and UV tolerance. It represents solid value for typical sloped roofing projects, though teams expecting consistent factory-applied adhesion should plan for mechanical fastening or seam reinforcement.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCan this underlayment be left exposed during reroofing?\u003c\/strong\u003e\u003cbr\u003eYes, it is rated for up to 60 days of ultraviolet exposure, making it suitable for typical reroofing timelines where temporary exposure occurs.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs it self-adhering?\u003c\/strong\u003e\u003cbr\u003eCustomer feedback indicates adhesive strength is mixed; this product is primarily a water resistant synthetic underlayment and installers often use mechanical fasteners or additional seam treatment when permanent adhesion is required.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat roof types is it compatible with?\u003c\/strong\u003e\u003cbr\u003eIt is intended for sloped commercial and residential roofs and works under asphalt shingles or metal cladding as a waterproof underlayer.\u003c\/p\u003e","brand":"SIPA","offers":[{"title":"Default Title","offer_id":48648517026011,"sku":"B08P166F8H","price":749.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61Ap1lDztSL._AC_SL1500.jpg?v=1778616257","url":"https:\/\/gearmusthave.com\/products\/sipa-100-gsm-synthetic-waterproof-roof-underlayment-48-x-250-ft","provider":"GearMustHave","version":"1.0","type":"link"}