{"product_id":"johns-manville-glastite-flexible-base-ply-or-flashing-sheet-36-in-x-50-ft-roll","title":"Johns Manville GlasTite Flexible Base Ply or Flashing Sheet, 36 in. x 50 ft Roll","description":"\u003ch1\u003eJohns Manville GlasTite Flexible Base Ply or Flashing Sheet, 36 in. x 50 ft Roll\u003c\/h1\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eJohns Manville GlasTite Flexible is a base sheet, ply sheet and flashing membrane for built-up roofing, supplied as a 36 in. x 50 ft roll. Its fiber glass\/polyester composite reinforcement mat delivers flexibility and high tensile strength, and imprinted lay lines help installers maintain proper exposure across multiple plies.\u003c\/strong\u003e\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eKey Features:\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree roles:\u003c\/strong\u003e Intended for use as a base sheet, ply sheet, or flashing membrane in built-up roofing systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible reinforcement:\u003c\/strong\u003e Fiber glass\/polyester composite reinforcement mat provides superior flexibility and conformability for quick installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh tensile strength:\u003c\/strong\u003e Exceptionally high tensile strength delivers superior protection against splitting plus excellent puncture resistance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlashing ready:\u003c\/strong\u003e Conformability makes it ideal for tight flashing systems at parapet walls, skylights, penetrations, drains and vents.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLay lines:\u003c\/strong\u003e Imprinted lay lines on the top surface help maintain proper exposure and correct ply count.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eASTM compliance:\u003c\/strong\u003e Meets the requirements of ASTM D 4601, Type II.\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\u003eJohns Manville\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, 36 in. x 50 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\u003eGlasTite Flexible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e36 in. x 50 ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAsphalt felt sheet with fiber glass\/polyester composite reinforcement mat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurfacing\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFine mineral parting agent\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\u003e150 sq ft nominal per roll before laps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApprovals\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMeets the requirements of ASTM D 4601, Type II\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIntended use\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBase sheet, ply sheet, or flashing membrane in built-up roofing systems\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 36 in. x 50 ft roll provides 150 sq ft of nominal coverage before laps. For base-sheet application, follow the specified lap and fastening pattern (JM fastening-pattern details are available for various attachment methods); for plies, use the lay lines to set exposure.\u003c\/p\u003e\u003ch2\u003eFit and Compatibility:\u003c\/h2\u003e\u003cp\u003eUse within Johns Manville built-up roofing systems as a base sheet, ply sheet or flashing membrane, including at parapets, skylights, penetrations, drains and vents. Mopping asphalt, fasteners and cap sheets 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 order?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e One roll of GlasTite Flexible, 36 in. wide by 50 ft long.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: How much roof does one roll cover?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e About 150 sq ft nominal before laps; deduct for side and end laps per specification.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: Can it be used for flashing?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes; its flexibility and conformability make it well suited to tight flashing systems at parapet walls, skylights, penetrations, drains and vents.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: How do I keep my ply exposure correct?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Imprinted lay lines on the top surface guide proper exposure and the correct number of plies.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: What standard does it meet?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e It meets the requirements of ASTM D 4601, Type II.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: Is it fastened or mopped?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e It is used in built-up roofing; base-sheet attachment follows the specified fastening patterns or adhesive methods for the system.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eExpert Verdict — Reviewed by the SuperArbor Pro Desk\u003c\/h2\u003e\u003cp\u003eGlasTite Flexible is a go-to sheet when one product must serve as base sheet, interply and flashing felt in a BUR system, simplifying stock on mixed-detail jobs. Let the roll relax before unrolling, and use the lay lines to hold exposure consistent across the crew. For demanding flashing details, take advantage of its conformability rather than forcing a stiffer ply sheet into corners.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eBuilt-up roofing installation involves hot asphalt or torch-adjacent work and hot surfaces; use appropriate PPE and follow the system's installation and fire-safety requirements.\u003c\/em\u003e\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eOrder the JM GlasTite Flexible 36 in. x 50 ft roll for a versatile BUR base, ply and flashing sheet.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Johns Manville","offers":[{"title":"Default Title","offer_id":53524455915887,"sku":"JM90001268","price":247.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0830\/3499\/7051\/files\/glasply-iv-glastite2512x1413px.png?v=1790284350","url":"https:\/\/superarbor.io\/products\/johns-manville-glastite-flexible-base-ply-or-flashing-sheet-36-in-x-50-ft-roll","provider":"Super Arbor","version":"1.0","type":"link"}