{"product_id":"johns-manville-dynalastic-250-s-base-ply-or-flashing-sheet-sbs-modified-bitumen-roll-39-3","title":"Johns Manville DynaLastic 250 S Base Ply or Flashing Sheet – SBS-Modified Bitumen Roll, 39-3\/8 in. x 32 ft 10 in.","description":"\u003ch1\u003eJohns Manville DynaLastic 250 S Base Ply or Flashing Sheet – SBS-Modified Bitumen Roll, 39-3\/8 in. x 32 ft 10 in.\u003c\/h1\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eJM DynaLastic 250 S is a polyester-reinforced SBS-modified bitumen base or ply sheet for multi-ply roofing systems and flashing, supplied as one roll 39-3\/8 in. wide by 32 ft 10 in. long. Its SBS rubber-and-asphalt blend gives the sheet elasticity and recovery to handle roof expansion and contraction. Meets ASTM D 6164, Type II, Grade S.\u003c\/strong\u003e\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eKey Features:\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSBS flexibility:\u003c\/strong\u003e High-quality SBS rubber and asphalt blend lends elasticity and flexibility to the sheet.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMovement capable:\u003c\/strong\u003e Elongation and recovery properties accommodate continual roof expansion and contraction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePolyester reinforcement:\u003c\/strong\u003e Heavy-duty mat with bidirectional glass-scrim reinforcement offers robust tear strength and puncture resistance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWind and hail performance:\u003c\/strong\u003e Reinforced construction supports high wind performance and an excellent hail rating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensional stability:\u003c\/strong\u003e The sheet exhibits strong dimensional stability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParting agent surface:\u003c\/strong\u003e A fine material parting agent is applied to both sides of the product.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCode compliance:\u003c\/strong\u003e Meets the requirements of ASTM D 6164, Type II, Grade S.\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, 39-3\/8 in. x 32 ft 10 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct line\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDynaLastic 250 S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e39-3\/8 in. x 32 ft 10 in. roll\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLength\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e32 ft 10 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWidth\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e39-3\/8 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSBS-modified bitumen with heavy-duty polyester-reinforced mat (bidirectional glass-scrim)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurfacing\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFine material parting agent on both sides\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 or ply sheet in multi-ply roofing systems; flashing sheet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApprovals\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMeets ASTM D 6164, Type II, Grade S\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\u003eEach roll measures 39-3\/8 in. x 32 ft 10 in., roughly 108 sq ft of sheet per roll; subtract laps and use the specified side and end laps for the system when sizing plies or flashing.\u003c\/p\u003e\u003ch2\u003eFit and Compatibility:\u003c\/h2\u003e\u003cp\u003eDesigned for use as a base or ply sheet in Johns Manville multi-ply (BUR and MB) roofing systems; pair with JM approved mopping, hot asphalt or cold adhesive systems and compatible membranes and flashings per the JM specification.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eFrequently Asked Questions (FAQ):\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eQ: What is on one roll?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e One roll 39-3\/8 in. wide by 32 ft 10 in. long.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: Where is this sheet used?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e As a polyester-reinforced base or ply sheet in a variety of multi-ply roofing systems, and for flashing.\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 6164, Type II, Grade S.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: What reinforcement does it use?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e A heavy-duty polyester mat with bidirectional glass-scrim reinforcement for tear strength and puncture resistance.\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 Approximately 108 sq ft of sheet, less required side and end laps per the roofing specification.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eExpert Verdict — Reviewed by the SuperArbor Pro Desk\u003c\/h2\u003e\u003cp\u003eUse DynaLastic 250 S where movement capability matters: the SBS blend's elongation and recovery handle thermal cycling better than plain ply sheets. Set rolls to relax, maintain specified laps and fully embed the sheet in adhesive or asphalt per the JM system spec. Its puncture and tear strength make it a strong choice for flashing details too.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eModified bitumen installation involves hot asphalt, torches or solvents depending on the system; follow JM application instructions and fire-safety requirements on the roof.\u003c\/em\u003e\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eOrder JM DynaLastic 250 S base ply or flashing sheet for flexible, reinforced multi-ply roof performance.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Johns Manville","offers":[{"title":"Default Title","offer_id":53524437893487,"sku":"JMDL250BA","price":119.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0830\/3499\/7051\/files\/JMDL250BA_0.jpg?v=1790284105","url":"https:\/\/superarbor.io\/products\/johns-manville-dynalastic-250-s-base-ply-or-flashing-sheet-sbs-modified-bitumen-roll-39-3","provider":"Super Arbor","version":"1.0","type":"link"}