{"product_id":"1616148-r-21-ecobattr-unfaced-fiberglass-insulation-batt-5-1-2-x-15-x-93-67-81-sf","title":"Johns Manville JM R-21 Unfaced Fiberglass Batt Insulation for 2x6 Walls, 15 in. x 93 in. (67.81 sq-ft)","description":"\u003ch1\u003eR-21 Unfaced Fiberglass Batt Insulation (15 in. x 93 in.)\u003c\/h1\u003e\n    \u003cp\u003e\u003cstrong\u003eJM R-21 unfaced fiberglass batts deliver thermal performance and sound control for 2x6 wood-stud cavities. Precut to 93 in. for standard 8 ft. walls, each bag covers 67.81 sq. ft. and can be used in walls, floors, and crawlspaces.\u003c\/strong\u003e\u003c\/p\u003e\n    \u003chr\u003e\n    \u003ch2\u003eKey Features:\u003c\/h2\u003e\n    \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eRight-Size for 2x6 Framing:\u003c\/strong\u003e 15 in. wide x 5.5 in. thick batts fit 2x6 wood-stud cavities for a secure friction fit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnfaced for Flexible Assemblies:\u003c\/strong\u003e No vapor retarder, making it suitable for layering with existing insulation or where a separate vapor control layer is desired\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnergy \u0026amp; Comfort Upgrade:\u003c\/strong\u003e R-21 helps reduce heat transfer to improve overall energy efficiency\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSound Control:\u003c\/strong\u003e Helps reduce noise transmission through wall, floor, and ceiling assemblies\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFormaldehyde-Free \u0026amp; Durable Fiberglass:\u003c\/strong\u003e Made with resilient glass fibers; designed not to rot or mildew and to remain dimensionally stable in the cavity\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \u003cp\u003e\u003cstrong\u003ePlease check the Product Data Sheet \u003ca href=\"https:\/\/superarbor.io\/cdn\/shop\/files\/c1d537bd-6de7-40a6-a50f-9b05cd74b945.pdf?v=1766980664\" target=\"_blank\"\u003e\u003cspan style=\"color: rgb(255, 128, 0);\"\u003eHere\u003c\/span\u003e\u003c\/a\u003e\u003c\/strong\u003e\u003c\/p\u003e\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 (Johns Manville)\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\u003eModel \/ Manufacturer Part #\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eU1321\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInsulation Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFiberglass batt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFaced or Unfaced\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnfaced\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-21\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoverage Area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e67.81 sq ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBatt Width\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBatt Length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e93 in (7.75 ft)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInsulation Thickness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5.5 in (5-1\/2 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFits Wall Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2 x 6 wall\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStud Spacing Compatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16 in on-center (standard 8 ft wall precut length)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePieces per Bag\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e28.6 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBag Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.9 ft x 40 in x 15 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBatt\/Roll Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7.75 ft x 15 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInsulation Features\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFriction fit; sound control\/soundproofing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication Areas\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWalls, floors, ceilings, basements, attics, crawlspaces (new construction and remodels)\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\u003eWood 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\u003eTemperature Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e850°F\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\u003eStandards\/Certifications\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eASTM C665 Type I; ASTM E136; IBC; Energy Star Certified; Greenguard Gold Certified; Indoor Air Quality Certified; NAIMA 16 CFR Part 460; Recycled Content Certified\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: Is this insulation faced?\u003c\/strong\u003e\u003cbr\u003e\n    \u003cstrong\u003eA:\u003c\/strong\u003e No—this is unfaced fiberglass batt insulation (no vapor retarder).\u003c\/p\u003e\n    \u003chr\u003e\n    \n    \u003cp\u003e\u003cstrong\u003eQ: What wall cavity does it fit?\u003c\/strong\u003e\u003cbr\u003e\n    \u003cstrong\u003eA:\u003c\/strong\u003e It’s sized for 2x6 wood-stud framing with 16 in. on-center spacing (15 in. wide batts).\u003c\/p\u003e\n    \u003chr\u003e\n    \n    \u003cp\u003e\u003cstrong\u003eQ: How much area does one bag cover?\u003c\/strong\u003e\u003cbr\u003e\n    \u003cstrong\u003eA:\u003c\/strong\u003e One bag covers 67.81 sq. ft.\u003c\/p\u003e\n    \u003chr\u003e\n    \n    \u003cp\u003e\u003cstrong\u003eQ: Can I use this in basements, attics, or crawlspaces?\u003c\/strong\u003e\u003cbr\u003e\n    \u003cstrong\u003eA:\u003c\/strong\u003e Yes—it's listed for use in areas such as attics, basements, ceilings, crawlspaces, floors, and interior\/exterior walls (where appropriate for fiberglass batts).\u003c\/p\u003e\n    \u003chr\u003e\n    \n    \u003cp\u003e\u003cstrong\u003eQ: Do I need special tools to cut it?\u003c\/strong\u003e\u003cbr\u003e\n    \u003cstrong\u003eA:\u003c\/strong\u003e Batts can be cut to fit using a utility knife and a straightedge; wear appropriate PPE when handling fiberglass.\u003c\/p\u003e\n    \u003chr\u003e\n    \n    \u003ch2\u003eQuiet luxury, engineered into the walls\u003c\/h2\u003e\n    \u003cp\u003eThere’s a particular elegance in rooms that feel calm—where temperature holds steady and sound softens at the edges. These R-21 unfaced fiberglass batts tuck cleanly into 2x6 cavities, creating an invisible layer of comfort that lets your finishes shine. Use them as the quiet foundation behind paneling, plaster, or millwork-heavy spaces where acoustics matter as much as aesthetics. It’s the kind of behind-the-scenes upgrade that makes a home feel unmistakably more refined.\u003c\/p\u003e\n    \n    \u003chr\u003e\n    \u003cp\u003e\u003cstrong\u003eUpgrade your comfort and sound control—choose JM R-21 unfaced batts to efficiently insulate 2x6 wall cavities with reliable coverage per bag.\u003c\/strong\u003e\u003c\/p\u003e\n    \u003cp\u003e\u003ca href=\"https:\/\/superarbor.io\/cdn\/shop\/files\/2a004d34-95e0-47cf-ab7d-49d4774f8cbb.pdf?v=1766980659\" target=\"_blank\"\u003eWarranty\u003c\/a\u003e\u003c\/p\u003e\n    \u003cp\u003e\u003ca href=\"https:\/\/superarbor.io\/cdn\/shop\/files\/0f639091-a0ea-465b-a276-a4de1fe7414a.pdf?v=1766980661\" target=\"_blank\"\u003eInstallation\u003c\/a\u003e\u003c\/p\u003e","brand":"Johns Manville","offers":[{"title":"Default Title","offer_id":48991796330710,"sku":"31979110179","price":162.44,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0778\/5244\/2838\/files\/johns-manville-fiberglass-insulation-u1321-64_1000.jpg?v=1783638124","url":"https:\/\/buildsupplyus.myshopify.com\/products\/1616148-r-21-ecobattr-unfaced-fiberglass-insulation-batt-5-1-2-x-15-x-93-67-81-sf","provider":"Buildsupply","version":"1.0","type":"link"}