{"product_id":"johns-manville-dexcell-cement-roof-board-7-16-in-cementitious-cover-board-4-ft-x-8-ft-and","title":"Johns Manville DEXcell Cement Roof Board – 7\/16 in. Cementitious Cover Board, 4 ft x 8 ft and 4 ft x 4 ft, Off White","description":"\u003ch1\u003eJohns Manville DEXcell Cement Roof Board – 7\/16 in. Cementitious Cover Board, 4 ft x 8 ft and 4 ft x 4 ft, Off White\u003c\/h1\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eJohns Manville DEXcell Cement Roof Board is a 7\/16 in. thick lightweight cementitious cover board in 4 ft x 8 ft or 4 ft x 4 ft panels with an off-white face. Its high compressive strength and moisture, mold and mildew resistance make it ideal where wind uplift and puncture resistance matter. Sold per piece; install under single-ply membranes over insulation.\u003c\/strong\u003e\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eKey Features:\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eImpact resistance:\u003c\/strong\u003e A lightweight cementitious core delivers exceptional impact resistance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh compressive strength:\u003c\/strong\u003e Exceptionally high compressive strength improves overall roof system performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMoisture tolerant:\u003c\/strong\u003e The cement board withstands prolonged exposure to moisture.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMold resistant:\u003c\/strong\u003e Scores a maximum 10 for mold resistance when tested per ASTM D 3273.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire performance:\u003c\/strong\u003e FM Class 1 for fire barrier requirements and UL Class A unlimited slope with excellent surface burning characteristics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUplift and puncture defense:\u003c\/strong\u003e Ideal for systems where wind uplift and puncture resistance are a concern.\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 piece (PC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct line\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDEXcell Cement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAvailable sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7\/16\" x 4' x 8'; 7\/16\" x 4' x 4'\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCementitious (cement-based) roof board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColor \/ finish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOff White\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThickness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7\/16 in.\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 8 ft or 4 ft x 4 ft panels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWind \/ fire \/ impact rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFM Class 1 for fire barrier requirements; UL Class A unlimited slope\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApprovals\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFM Class 1; UL Class A; ASTM D 3273 mold resistance score of 10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIntended use\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSpecialty coverboard under commercial roofing membranes\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 8 ft panel covers 32 sq ft and one 4 ft x 4 ft panel covers 16 sq ft before cutting and layout waste; divide the roof area by panel size to order boards.\u003c\/p\u003e\u003ch2\u003eFit and Compatibility:\u003c\/h2\u003e\u003cp\u003eUsed as a cover board over JM polyiso insulation beneath JM single-ply or multi-ply membranes; attach per the roofing system manufacturer's requirements (adhesive or mechanically fastened).\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eFrequently Asked Questions (FAQ):\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eQ: What sizes are available?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Two sizes: 7\/16 in. x 4 ft x 8 ft and 7\/16 in. x 4 ft x 4 ft.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: How much does one board cover?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The 4x8 board covers 32 sq ft and the 4x4 board covers 16 sq ft before cuts and waste.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: Can it handle moisture exposure?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the cement-based core withstands prolonged moisture exposure and scores a maximum 10 for mold resistance per ASTM D 3273.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: What fire ratings apply?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e FM Class 1 for fire barrier requirements and UL Class A unlimited slope with excellent surface burning characteristics.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: How is it attached?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Follow the membrane system's specification for adhesive or mechanical attachment over insulation.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eExpert Verdict — Reviewed by the SuperArbor Pro Desk\u003c\/h2\u003e\u003cp\u003eDEXcell Cement is the board to specify where job-site traffic, wind uplift or puncture risk is high, thanks to its high compressive strength and impact resistance. Choose the 4x8 size for fast coverage on open decks and the 4x4 size for easy handling in tight areas or around equipment. Stagger board joints and follow the membrane system's attachment pattern for rated performance.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eCement board edges and cut dust require gloves, eye protection and dust control when cutting; use proper roof fall protection during installation.\u003c\/em\u003e\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eSpecify JM DEXcell Cement Roof Board for high-strength, moisture-tolerant cover board protection on your next roof.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Johns Manville","offers":[{"title":"7\/16\" x 4' x 8'","offer_id":53524437401967,"sku":"JM70004782","price":34.5,"currency_code":"USD","in_stock":true},{"title":"7\/16\" x 4' x 4'","offer_id":53524437434735,"sku":"JM70004781","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0830\/3499\/7051\/files\/JM70004782_0.jpg?v=1790284098","url":"https:\/\/superarbor.io\/products\/johns-manville-dexcell-cement-roof-board-7-16-in-cementitious-cover-board-4-ft-x-8-ft-and","provider":"Super Arbor","version":"1.0","type":"link"}