{"product_id":"johns-manville-90000660-johns-manville-duraboard-1-in-x-4-ft-x-4-ft-high-density-perlite-roof-cover-board","title":"Johns Manville DuraBoard 1 in. x 4 ft. x 4 ft. High-Density Perlite Roof Cover Board","description":"\u003ch1\u003eJohns Manville DuraBoard 1 in. x 4 ft. x 4 ft. High-Density Perlite Roof Cover Board\u003c\/h1\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eJohns Manville DuraBoard is a 1 in. thick, 4 ft. x 4 ft. high-density perlite-based roof cover board made from expanded perlite and reinforcing cellulosic fibers. One piece covers 16 sq ft and is sold per piece. It is used under multi-ply and single-ply membranes and accepts direct SBS or APP torch application thanks to its polymerized asphalt emulsion coating.\u003c\/strong\u003e\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eKey Features:\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerlite core stability:\u003c\/strong\u003e Expanded perlite provides good dimensional stability, excellent insulation value with a stable R-value and fire resistance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTorch-ready coating:\u003c\/strong\u003e Polymerized asphalt emulsion coating allows direct SBS or APP membrane torch application without pre-heating the board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-density strength:\u003c\/strong\u003e High-density construction provides additional strength and durability on the roof.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh recycled content:\u003c\/strong\u003e Reinforcing cellulosic fibers consist of recycled newsprint, with recycled content certified by UL Environment for LEED contribution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 4x4 panel:\u003c\/strong\u003e 4 ft. x 4 ft. panel at 1 in. thickness covers 16 sq ft per board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCode-listed board:\u003c\/strong\u003e Meets ASTM C728, Type 2; UL Classified, FM Approved and Miami-Dade County Approved.\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\u003eManufacturer model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e90000660\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 board, 1 in. x 4 ft. x 4 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\u003eDuraBoard High-Density Perlite-Based Cover Board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 ft. x 4 ft., 1 in. thick\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\u003e16 sq ft per board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eExpanded perlite with reinforcing cellulosic fibers (recycled newsprint)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFinish \/ texture\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolymerized asphalt emulsion coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIntended use\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRoof cover board for multi-ply and single-ply roofing systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStandard\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eASTM C728, Type 2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApprovals\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUL Classified; FM Approved; Miami-Dade County Approved; ASTM C728, Type 2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoating benefit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAllows direct torch application of SBS or APP membranes without pre-heating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRecycled content\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eThird-party certified by UL Environment; contributes to LEED Materials credits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16 lb per board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAssembly\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eInstalled as a cover board layer; attach per JM system specification with compatible fasteners, plates or adhesives\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 4 ft. x 4 ft. board covers 16 sq ft, so a 100 sq ft square needs about 7 boards; order roughly 6-10% extra to allow for cuts and fit-up around penetrations. Boards are butted together with joints staggered per the roof system specification.\u003c\/p\u003e\u003ch2\u003eFit and Compatibility:\u003c\/h2\u003e\u003cp\u003eDuraBoard is used in JM multi-ply systems and can be installed a number of ways, including under SBS or APP torch-applied membranes directly on its polymerized coating. Single-ply attachment fasteners and plates, or approved adhesives, are sold separately; follow the JM system specification for the compatible attachment method.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eFrequently Asked Questions (FAQ):\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eQ: How much does one board cover?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Each 4 ft. x 4 ft. board covers 16 sq ft; a roofing square (100 sq ft) needs about 7 boards plus waste allowance.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: What is the board made of?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e It is a high-density perlite-based board of expanded perlite and reinforcing recycled cellulosic fibers with a polymerized asphalt emulsion coating.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: Can I torch a membrane directly to it?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the polymerized asphalt emulsion coating allows direct SBS or APP torch application without pre-heating, saving fuel and labor.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: Does it meet standards?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e It meets ASTM C728, Type 2, and is UL Classified, FM Approved and Miami-Dade County Approved.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: How is it attached?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Installation method varies by system; it can be set in adhesive or mechanically attached with compatible fasteners and plates per the JM specification.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: How heavy is one board?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e One 1 in. x 4 ft. x 4 ft. board weighs approximately 16 lb.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eExpert Verdict — Reviewed by the SuperArbor Pro Desk\u003c\/h2\u003e\u003cp\u003eDuraBoard is a good choice where you need a fire-resistant, dimensionally stable cover board over polyiso or as a substrate in multi-ply assemblies, and its torch-ready coating eliminates the pre-heating step required with heavily coated boards. Lay boards with joints butted and staggered from insulation joints, and attach with fastener patterns or adhesives called out in the JM system spec. For jobs needing higher compressive resistance or different thicknesses, confirm the specified DuraBoard thickness before ordering.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eTorch application and board handling require gloves, eye protection and fire-watch precautions; follow the membrane manufacturer's installation instructions and local code requirements.\u003c\/em\u003e\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eOrder Johns Manville DuraBoard 1 in. x 4 ft. x 4 ft. cover board for a stable, torch-ready roof substrate.\u003c\/strong\u003e\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eProduct Documents:\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.jm.com\/content\/dam\/jm\/global\/en\/commercial-roofing\/products\/assets\/application-guide\/rs-9417-product-weight-chart.pdf\" target=\"_blank\" rel=\"noopener\"\u003eInstallation Guide (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.jm.com\/content\/dam\/jm\/global\/en\/commercial-roofing\/products\/assets\/brochure\/rs-5134-perlite-advantages-sell-sheet-french.pdf\" target=\"_blank\" rel=\"noopener\"\u003eProduct Data Sheet (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.jm.com\/content\/dam\/jm\/global\/en\/commercial-roofing\/products\/assets\/sds-sui\/200000001890-us-1x.pdf\" target=\"_blank\" rel=\"noopener\"\u003eSafety Data Sheet (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Johns Manville","offers":[{"title":"Default Title","offer_id":53527321543023,"sku":"90000660","price":23.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0830\/3499\/7051\/files\/duraboard_31a955b4-2119-4b7f-a8fb-fc209aef2855.png?v=1790313927","url":"https:\/\/superarbor.io\/products\/johns-manville-90000660-johns-manville-duraboard-1-in-x-4-ft-x-4-ft-high-density-perlite-roof-cover-board","provider":"Super Arbor","version":"1.0","type":"link"}