{"product_id":"jm-johns-manville-r-19-fsk-faced-fiberglass-batt-insulation-16-in-x-48-in-6-1-2-in-thick-96-sq-ft","title":"JM (Johns Manville) R-19 FSK Faced Fiberglass Batt Insulation, 16 in x 48 in, 6-1\/2 in Thick (96 sq-ft)","description":"\u003ch1\u003eR-19 FSK Faced Fiberglass Batt Insulation (16 in x 48 in)\u003c\/h1\u003e\n    \u003cp\u003e\u003cstrong\u003eJM (Johns Manville) R-19 FSK-faced fiberglass batt insulation provides thermal and acoustical performance for wood, engineered wood, and steel frame construction. The foil-scrim-kraft (FSK-25) facing adds a vapor retarder and supports a 25\/50 or less fire hazard classification where codes permit exposed installation.\u003c\/strong\u003e\u003c\/p\u003e\n    \u003chr\u003e\n    \u003ch2\u003eKey Features:\u003c\/h2\u003e\n    \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eVapor Retarder Facing:\u003c\/strong\u003e FSK-25 foil-scrim-kraft facing helps control moisture and may be left exposed where codes permit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Performance:\u003c\/strong\u003e R-19 insulation helps resist heat transfer to improve energy efficiency\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire \u0026amp; Smoke Performance:\u003c\/strong\u003e Rated to ASTM E84 25\/50 or less (flame spread \u0026lt;25; smoke developed \u0026lt;50)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSound Control:\u003c\/strong\u003e Fiberglass batts help reduce sound transmission through wall, floor, and ceiling assemblies\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Fiberglass Construction:\u003c\/strong\u003e Inorganic glass fibers resist rot and mildew and won’t slump or settle under normal conditions\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \n    \u003chr\u003e\n    \u003ch2\u003eSpecifications Table:\u003c\/h2\u003e\n    \u003ctable\u003e\n        \u003cthead\u003e\n            \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\n        \u003c\/thead\u003e\n        \u003ctbody\u003e\n            \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eJM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eJohns Manville\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBatt Insulation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFiberglass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eR-Value\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eR-19\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWidth\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLength\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e48 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInsulation Thickness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e6-1\/2 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFacing Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFSK-25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFor wide variety of wood frame, engineered wood and steel frame construction\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFor Use With\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSteel stud framing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFlame Spread Index\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSmoke Developed Index\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWater Vapor Permeability\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.05 perm-in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWater Vapor Sorption\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;5 %\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecial Features\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eReinforced; Flame resistant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCertifications\/Standards\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eASTM C665 Type III Class A Category I; Energy Star Certified; IBC; Indoor Air Quality Certified; NAIMA 16 CFR Part 460; Recycled Content Certified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoverage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e96 sq-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFSK443\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003c\/tbody\u003e\n    \u003c\/table\u003e\n    \u003chr\u003e\n    \u003ch2\u003eFrequently Asked Questions (FAQ):\u003c\/h2\u003e\n    \n    \u003cp\u003e\u003cstrong\u003eQ: What wall cavity is this batt designed for?\u003c\/strong\u003e\u003cbr\u003e\n    \u003cstrong\u003eA:\u003c\/strong\u003e It’s 6-1\/2 in thick and commonly used in 2x6 wall cavities, including steel stud framing.\u003c\/p\u003e\n    \u003chr\u003e\n    \n    \u003cp\u003e\u003cstrong\u003eQ: Does the facing act as a vapor barrier\/retarder?\u003c\/strong\u003e\u003cbr\u003e\n    \u003cstrong\u003eA:\u003c\/strong\u003e Yes. The FSK-25 facing serves as an excellent vapor retarder.\u003c\/p\u003e\n    \u003chr\u003e\n    \n    \u003cp\u003e\u003cstrong\u003eQ: Can the foil facing be left exposed?\u003c\/strong\u003e\u003cbr\u003e\n    \u003cstrong\u003eA:\u003c\/strong\u003e It may be left exposed where local building codes permit.\u003c\/p\u003e\n    \u003chr\u003e\n    \n    \u003cp\u003e\u003cstrong\u003eQ: What are the fire\/smoke ratings?\u003c\/strong\u003e\u003cbr\u003e\n    \u003cstrong\u003eA:\u003c\/strong\u003e It carries a 25\/50 or less fire hazard classification per ASTM E84; flame spread index \u0026lt;25 and smoke developed index \u0026lt;50.\u003c\/p\u003e\n    \u003chr\u003e\n    \n    \u003cp\u003e\u003cstrong\u003eQ: What framing types and applications is it intended for?\u003c\/strong\u003e\u003cbr\u003e\n    \u003cstrong\u003eA:\u003c\/strong\u003e Designed for a wide variety of wood frame, engineered wood, and steel frame construction, including retrofit and new construction.\u003c\/p\u003e\n    \u003chr\u003e\n    \n    \u003ch2\u003eQuiet luxury, engineered into the walls\u003c\/h2\u003e\n    \u003cp\u003eThis R-19 FSK-faced batt is the kind of behind-the-scenes upgrade that makes a home feel unmistakably refined—more comfortable, calmer, and beautifully controlled. The crisp, light-reflective foil facing adds a clean, architectural finish while quietly working as a vapor retarder. Use it in stud bays where you want performance without visual noise, especially in spaces where acoustics matter—bedrooms, studios, or media rooms. It’s practical, polished, and foundational to elevated everyday living.\u003c\/p\u003e\n    \n    \u003chr\u003e\n    \u003cp\u003e\u003cstrong\u003eUpgrade your wall or floor cavities with JM R-19 FSK-faced batts for efficient comfort, sound control, and code-friendly vapor resistance.\u003c\/strong\u003e\u003c\/p\u003e","brand":"JM","offers":[{"title":"Default Title","offer_id":49006751580374,"sku":"31979110056","price":119.19,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0778\/5244\/2838\/files\/unnamed_ec2be84c-7842-4137-87af-db4978c7f21f.png?v=1783712437","url":"https:\/\/buildsupplyus.myshopify.com\/products\/jm-johns-manville-r-19-fsk-faced-fiberglass-batt-insulation-16-in-x-48-in-6-1-2-in-thick-96-sq-ft","provider":"Buildsupply","version":"1.0","type":"link"}