{"product_id":"johns-manville-unfaced-formaldehyde-free-fiberglass-insulation-batts-multiple-r-values","title":"Johns Manville Unfaced Formaldehyde-Free Fiberglass Insulation Batts, Multiple R-Values","description":"\u003ch1\u003eJohns Manville Unfaced Formaldehyde-Free Fiberglass Insulation Batts, Multiple R-Values\u003c\/h1\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eJohns Manville Unfaced Fiberglass Insulation Batts are formaldehyde-free thermal and acoustical insulation made of long, resilient glass fibers bonded with a thermosetting resin. Sold by the bag in six size\/R-value options from R-11 to R-21 for walls, floors and ceilings, they install between framing in vertical or horizontal applications. Kraft or foil faced variants are available separately in the JM line.\u003c\/strong\u003e\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eKey Features:\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFormaldehyde-Free:\u003c\/strong\u003e Will not off-gas formaldehyde in the indoor environment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermally Efficient:\u003c\/strong\u003e Provides effective resistance to heat transfer with R-values up to R-49 (RSI-8.6) in the JM line.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSound Control:\u003c\/strong\u003e Reduces transmission of sound through exterior and interior walls and floor or ceiling assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNoncombustible Glass:\u003c\/strong\u003e Made of durable inorganic glass fibers that are fire resistant and noncombustible.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensionally Stable:\u003c\/strong\u003e Bonded fibers will not slump in the wall cavity, settle or break down in normal applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNoncorrosive:\u003c\/strong\u003e Will not rot, mildew, deteriorate or corrode pipes, wiring and metal studs.\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 bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct line\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eJM Unfaced Fiberglass Insulation Batts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAvailable sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e['R-11, 3.625 in. x 16 in. x 96 in.', 'R-13, 3.5 in. x 15 in. x 105 in.', 'R-13, 3.625 in. x 16 in. x 96 in.', 'R-15, 3.5 in. x 16 in. x 96 in.', 'R-19, 6.5 in. x 24 in. x 48 in.', 'R-21, 5.5 in. x 16 in. x 96 in.']\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnfaced fiberglass (long resilient glass fibers bonded with thermosetting resin)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColor \/ finish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnfaced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.5 in. to 6.5 in. thick, 15 in. to 24 in. wide, 48 in. to 105 in. long by item\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThickness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.5 in. to 6.5 in. by item\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eR-value range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eR-11 to R-21 for the items listed (up to R-49 in the JM line)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFacing\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnfaced (kraft or foil vapor retarder facings available in the JM line)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIntended use\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eThermal and acoustical insulation for vertical and horizontal applications\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 bag covers a variable area depending on R-value and bag count; size the job by matching batt width to stud or joist spacing (15-16 in. for walls, 24 in. for some framing) and length to the cavity, then divide total square footage by the bag coverage listed for that item.\u003c\/p\u003e\u003ch2\u003eFit and Compatibility:\u003c\/h2\u003e\u003cp\u003eInstalls between standard wood or metal framing in walls, floors and ceilings. Unfaced batts need a separate vapor retarder where code requires one; JM kraft- or foil-faced batts provide that facing and are sold separately in the line.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eFrequently Asked Questions (FAQ):\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eQ: What sizes and R-values are available?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Six unfaced items are listed: R-11 through R-21 in widths from 15 in. to 24 in. and lengths from 48 in. to 105 in.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: Is this insulation formaldehyde-free?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, it is formaldehyde-free and will not off-gas formaldehyde in the indoor environment.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: Does it help with sound?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, it reduces sound transmission through exterior and interior walls and floor or ceiling assemblies.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: Do I need a vapor barrier?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e These batts are unfaced, so add a separate vapor retarder where your code requires one, or use JM kraft or foil faced batts.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: How do I calculate how many bags I need?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Multiply the wall or ceiling area in square feet and divide by the bag coverage listed for your chosen R-value and size.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: Will the batts sag over time?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e No, the bonded glass fibers are dimensionally stable and will not slump, settle or break down during normal applications.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eExpert Verdict — Reviewed by the SuperArbor Pro Desk\u003c\/h2\u003e\u003cp\u003eChoose batt thickness to match the cavity depth: 3.5 in. for 2x4 walls (R-11 to R-15) and 5.5 in. to 6.5 in. for 2x6 walls (R-19 to R-21). Fill edges completely without compressing the batt, since compressed fiberglass loses R-value. In humid climates or conditioned assemblies, pair unfaced batts with a smart or poly vapor retarder as your code requires.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eWear gloves, long sleeves, eye protection and a dust mask when handling fiberglass insulation to avoid skin and respiratory irritation.\u003c\/em\u003e\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eInsulate walls and ceilings with Johns Manville unfaced formaldehyde-free fiberglass batts in six R-value options.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Johns Manville","offers":[{"title":"Default Title","offer_id":53522993348975,"sku":"JMU1314","price":56.32,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0830\/3499\/7051\/files\/ProductImage_JohnsManville_JMU1314.jpg?v=1790236301","url":"https:\/\/superarbor.io\/products\/johns-manville-unfaced-formaldehyde-free-fiberglass-insulation-batts-multiple-r-values","provider":"Super Arbor","version":"1.0","type":"link"}