{"id":24056,"date":"2022-10-07T15:01:27","date_gmt":"2022-10-07T15:01:27","guid":{"rendered":"https:\/\/thetibble.com\/?p=24056"},"modified":"2023-08-03T21:51:28","modified_gmt":"2023-08-03T21:51:28","slug":"r40-insulation-thickness-guide","status":"publish","type":"post","link":"https:\/\/thetibble.com\/r40-insulation-thickness-guide\/","title":{"rendered":"R40 Insulation Thickness Guide (Table for All Types)"},"content":{"rendered":"<style>img#mv-trellis-img-1::before{padding-top:25%; }img#mv-trellis-img-1{display:block;}img#mv-trellis-img-2::before{padding-top:72.9%; }img#mv-trellis-img-2{display:block;}img#mv-trellis-img-3::before{padding-top:72.9%; }img#mv-trellis-img-3{display:block;}img#mv-trellis-img-4::before{padding-top:72.9%; }img#mv-trellis-img-4{display:block;}<\/style>\n<p>Insulation can be a tricky thing to work with, especially when trying to understand different thicknesses. R40 insulation is not the most common insulation out there, but it is worth knowing about the different types that can be used for this rating.<\/p>\n\n\n\n<p>This article will provide you with various details regarding R40 insulation. Most importantly, an easy-to-read and informative table can be found that shows the thickness of each type of insulation needed to reach R40, and the best-selling option for different types of insulation.<\/p>\n\n\n<div class=\"lazyblock-nutshell-ZPf8Rl wp-block-lazyblock-nutshell\"><p class=\"has-text-align-left has-text-color has-background\" style=\"background-color:#e7d1b1;color:#575f60;font-size:18px\"><noscript><img loading=\"lazy\" decoding=\"async\" width=\"200\" height=\"50\" class=\"wp-image-3497\" style=\"width: 200px;\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/08\/nutshell1-11.png\" alt=\"\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/08\/nutshell1-11.png 600w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/08\/nutshell1-11-300x75.png 300w\" sizes=\"(max-width: 200px) 100vw, 200px\"><\/noscript><img loading=\"eager\" decoding=\"async\" width=\"200\" height=\"50\" class=\"wp-image-3497 eager-load\" style=\"width: 200px;\" src=\"data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20viewBox='0%200%20200%2050'%3E%3Crect%20width='200'%20height='50'%20style='fill:%23e3e3e3'\/%3E%3C\/svg%3E\" alt=\"\" sizes=\"(max-width: 200px) 100vw, 200px\" data-pin-media=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/08\/nutshell1-11.png\" id=\"mv-trellis-img-1\" data-src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/08\/nutshell1-11.png.webp\" data-srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2021\/08\/nutshell1-11.png.webp 600w, https:\/\/thetibble.com\/wp-content\/uploads\/2021\/08\/nutshell1-11-300x75.png.webp 300w\" data-svg=\"1\" data-trellis-processed=\"1\"><br><strong>R38 is more commonly specified. R40 can be used instead, but the increase in thermal resistance is too insignificant to warrant the extra cost. The thinnest layer achieving R40 is with closed cell spray foam polyurethane (6.7\"). The thickest layer achieving R40 is with loose-fill fiberglass (16.7\"). <\/strong> <\/p><\/div>\n\n\n<h2 class=\"wp-block-heading\">R40 in Not a Common Rating\/Requirement<\/h2>\n\n\n\n<p>It is more common for R38 or R49 to be used. R40 is not a typically used in the world of insulation R-values.<\/p>\n\n\n\n<p>When compared to <a href=\"https:\/\/thetibble.com\/r38-insulation-thickness-guide\/\" data-type=\"post\" data-id=\"23271\">R38<\/a>, an R40 rating doesn&rsquo;t offer a significant enough difference to justify it being used instead of R38. Using R40 instead of R38 would cost slightly more with little to no increased benefit. <\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><noscript><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"729\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Man-pouring-cellulose-insulation-in-the-attic-while-wearing-a-PPE.jpg\" alt=\"Man pouring cellulose insulation in the attic while wearing a PPE\" class=\"wp-image-24757\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Man-pouring-cellulose-insulation-in-the-attic-while-wearing-a-PPE.jpg 1000w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Man-pouring-cellulose-insulation-in-the-attic-while-wearing-a-PPE-300x219.jpg 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Man-pouring-cellulose-insulation-in-the-attic-while-wearing-a-PPE-768x560.jpg 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Man-pouring-cellulose-insulation-in-the-attic-while-wearing-a-PPE-735x536.jpg 735w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Man-pouring-cellulose-insulation-in-the-attic-while-wearing-a-PPE-335x244.jpg 335w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Man-pouring-cellulose-insulation-in-the-attic-while-wearing-a-PPE-347x253.jpg 347w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Man-pouring-cellulose-insulation-in-the-attic-while-wearing-a-PPE-520x379.jpg 520w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Man-pouring-cellulose-insulation-in-the-attic-while-wearing-a-PPE-640x467.jpg 640w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Man-pouring-cellulose-insulation-in-the-attic-while-wearing-a-PPE-960x700.jpg 960w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\"><\/noscript><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"729\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Man-pouring-cellulose-insulation-in-the-attic-while-wearing-a-PPE.jpg.webp\" alt=\"Man pouring cellulose insulation in the attic while wearing a PPE\" class=\"wp-image-24757 lazyload\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Man-pouring-cellulose-insulation-in-the-attic-while-wearing-a-PPE.jpg.webp 1000w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Man-pouring-cellulose-insulation-in-the-attic-while-wearing-a-PPE-300x219.jpg.webp 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Man-pouring-cellulose-insulation-in-the-attic-while-wearing-a-PPE-768x560.jpg.webp 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Man-pouring-cellulose-insulation-in-the-attic-while-wearing-a-PPE-735x536.jpg.webp 735w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Man-pouring-cellulose-insulation-in-the-attic-while-wearing-a-PPE-335x244.jpg.webp 335w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Man-pouring-cellulose-insulation-in-the-attic-while-wearing-a-PPE-347x253.jpg.webp 347w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Man-pouring-cellulose-insulation-in-the-attic-while-wearing-a-PPE-520x379.jpg.webp 520w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Man-pouring-cellulose-insulation-in-the-attic-while-wearing-a-PPE-640x467.jpg.webp 640w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Man-pouring-cellulose-insulation-in-the-attic-while-wearing-a-PPE-960x700.jpg.webp 960w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\" data-pin-media=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Man-pouring-cellulose-insulation-in-the-attic-while-wearing-a-PPE.jpg\" id=\"mv-trellis-img-2\" data-trellis-processed=\"1\"><\/figure>\n\n\n\n<p>When compared to R49, the benefits that are provided are more significant than those offered by R40. R49 is like the &ldquo;next step up&rdquo; on the rankings for when a significant difference becomes noticeable after R38.<\/p>\n\n\n\n<p>Furthermore, if R49 is required, the R40 is not sufficient to make the house code-compliant or sufficiently insulated.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Insulation Abilities of R40<\/h2>\n\n\n\n<p><a href=\"https:\/\/thetibble.com\/insulation-r-value-what-it-mean\/\" data-type=\"post\" data-id=\"23233\">R-values<\/a> are a measure of how effectively insulation prevents heat transfer through conduction. Conduction is the heat transfer via solid materials. <\/p>\n\n\n\n<p>An R-value of 40 stops about 97% of the heat transfer that would occur via conduction. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where Can R40 Insulation Be Used?<\/h2>\n\n\n\n<p>R40 insulation can be used wherever R38 insulation is required. In such cases, R40 will be a little excessive, but not by much. That additional amount of insulation may provide some extra benefits as well. <\/p>\n\n\n\n<p>Although there may not be a notable increase in the amount of heat that can pass through, the extra thickness can make the room more soundproof.<\/p>\n\n\n\n<p>The extra thickness could also (depending on the insulation used) help increase the strength of the structure the insulation is used on as well as increase the resistance to fire. <\/p>\n\n\n\n<p>Where R40 insulation can be used also depends on the climate that the home is in. <a rel=\"noreferrer noopener\" href=\"https:\/\/codes.iccsafe.org\/content\/IRC2021P2\/chapter-11-re-energy-efficiency#IRC2021P2_Pt04_Ch11_SecN1102.1.3\" target=\"_blank\">Table N1102.1.3<\/a> of the International Residential Code (IRC) explicitly outlines this. <\/p>\n\n\n\n<p>R38 insulation (and so R40 could be used) is only ever required in the floor of homes in zones 7 and 8. Some states that lie in zones 7 and 8 are northern parts of Wisconsin, northern parts of Minnesota, and Alaska. <\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><noscript><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"729\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Different-types-of-insulations-for-house.jpg\" alt=\"Different types of insulations: Loose-fill fiberglass, Loose-fill mineral wool, Loose-fill cellulose, Fiberglass batt, Mineral wool batt, Open cell polyurethane spray foam, Closed cell polyurethane spray foam and Foam boards\" class=\"wp-image-24755\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Different-types-of-insulations-for-house.jpg 1000w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Different-types-of-insulations-for-house-300x219.jpg 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Different-types-of-insulations-for-house-768x560.jpg 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Different-types-of-insulations-for-house-735x536.jpg 735w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Different-types-of-insulations-for-house-335x244.jpg 335w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Different-types-of-insulations-for-house-347x253.jpg 347w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Different-types-of-insulations-for-house-520x379.jpg 520w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Different-types-of-insulations-for-house-640x467.jpg 640w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Different-types-of-insulations-for-house-960x700.jpg 960w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\"><\/noscript><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"729\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Different-types-of-insulations-for-house.jpg.webp\" alt=\"Different types of insulations: Loose-fill fiberglass, Loose-fill mineral wool, Loose-fill cellulose, Fiberglass batt, Mineral wool batt, Open cell polyurethane spray foam, Closed cell polyurethane spray foam and Foam boards\" class=\"wp-image-24755 lazyload\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Different-types-of-insulations-for-house.jpg.webp 1000w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Different-types-of-insulations-for-house-300x219.jpg.webp 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Different-types-of-insulations-for-house-768x560.jpg.webp 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Different-types-of-insulations-for-house-735x536.jpg.webp 735w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Different-types-of-insulations-for-house-335x244.jpg.webp 335w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Different-types-of-insulations-for-house-347x253.jpg.webp 347w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Different-types-of-insulations-for-house-520x379.jpg.webp 520w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Different-types-of-insulations-for-house-640x467.jpg.webp 640w, https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Different-types-of-insulations-for-house-960x700.jpg.webp 960w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\" data-pin-media=\"https:\/\/thetibble.com\/wp-content\/uploads\/2022\/10\/Different-types-of-insulations-for-house.jpg\" id=\"mv-trellis-img-3\" data-trellis-processed=\"1\"><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">R40 Insulation Thickness Guide: Table<\/h2>\n\n\n\n<p>These climates need better insulation because they are more likely to experience colder and more frigid temperatures.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Insulation Type<\/strong><\/td><td><strong>Inherent R-value (per inch thickness)<\/strong><\/td><td><strong>Thickness to achieve R40<\/strong><\/td><td><strong>Best-selling option<\/strong><\/td><\/tr><tr><td><strong><a href=\"https:\/\/thetibble.com\/fiberglass-insulation-complete-guide\/\" data-type=\"post\" data-id=\"23842\">Loose-fill fiberglass<\/a><\/strong><\/td><td>2.2-2.7<\/td><td>&plusmn; 16.7&Prime;<\/td><td>Owens corning 19<\/td><\/tr><tr><td><strong><a href=\"https:\/\/thetibble.com\/mineral-wool-insulation-guide\/\" data-type=\"post\" data-id=\"23589\">Loose-fill mineral wool<\/a><\/strong><\/td><td>3-3.3<\/td><td>&plusmn; 12.7&Prime;<\/td><td>R15 comfortbatt<\/td><\/tr><tr><td><strong><a href=\"https:\/\/thetibble.com\/cellulose-insulation-complete-guide\/\">Loose-fill cellulose<\/a><\/strong><\/td><td>3.2-3.8<\/td><td>&plusmn; 11.4&Prime;<\/td><td>Borate only cellulose<\/td><\/tr><tr><td><em><strong><a href=\"https:\/\/www.amazon.com\/dp\/B084KYCMG9?tag=hvacbuzz-20\">Fiberglass batt<\/a><\/strong> <sub><sup>(amazon link)<\/sup><\/sub><\/em><\/td><td>3.1-3.4<\/td><td>&plusmn; 12.5&Prime; <\/td><td>Knauf insulation EcoBatt<\/td><\/tr><tr><td><strong><a href=\"https:\/\/thetibble.com\/mineral-wool-insulation-guide\/\" data-type=\"post\" data-id=\"23589\">Mineral wool batt<\/a><\/strong><\/td><td>3-3.3<\/td><td>&plusmn; 12.7&Prime; <\/td><td>Havelock Wool<\/td><\/tr><tr><td><strong><a href=\"https:\/\/thetibble.com\/plastic-fiber-insulation-guide\/\">Plastic fiber batt<\/a><\/strong><\/td><td>3.8-4.3<\/td><td>&plusmn; 10&Prime; <\/td><td>JM Comfort Therm Fiberglass<\/td><\/tr><tr><td><strong><a href=\"https:\/\/thetibble.com\/natural-fiber-insulation-guide\/\">Natural fiber batt<\/a><\/strong><\/td><td>3.4<\/td><td>&plusmn; 11.8&Prime;<\/td><td>Owens Corning<\/td><\/tr><tr><td><strong><a href=\"https:\/\/thetibble.com\/spray-foam-insulation-guide\/\">Open cell polyurethane spray foam<\/a><\/strong><\/td><td>3.5<\/td><td>&plusmn; 11.4&Prime;<\/td><td>Loctite tite foam<\/td><\/tr><tr><td><strong><em><a rel=\"noreferrer noopener\" href=\"https:\/\/www.amazon.com\/dp\/B092LK9F6N?tag=hvacbuzz-20\" target=\"_blank\">Closed cell polyurethane spray foam<\/a><\/em><\/strong> <em><sub><sup>(amazon link) <\/sup><\/sub><\/em><\/td><td>5-7<\/td><td>&plusmn; 6.7&Prime; <\/td><td>Tiger foam<\/td><\/tr><tr><td><strong><a href=\"https:\/\/thetibble.com\/foam-board-insulation-guide\/\">Foam boards<\/a><\/strong><\/td><td>3.6-8<\/td><td>&plusmn; 6.9&Prime;<\/td><td>SilveRboard<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><noscript><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"729\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2023\/03\/Inches-required-to-achieve-R40-for-different-types-of-insulation.jpg\" alt=\"\" class=\"wp-image-30944\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2023\/03\/Inches-required-to-achieve-R40-for-different-types-of-insulation.jpg 1000w, https:\/\/thetibble.com\/wp-content\/uploads\/2023\/03\/Inches-required-to-achieve-R40-for-different-types-of-insulation-300x219.jpg 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2023\/03\/Inches-required-to-achieve-R40-for-different-types-of-insulation-768x560.jpg 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2023\/03\/Inches-required-to-achieve-R40-for-different-types-of-insulation-960x700.jpg 960w, https:\/\/thetibble.com\/wp-content\/uploads\/2023\/03\/Inches-required-to-achieve-R40-for-different-types-of-insulation-150x109.jpg 150w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\"><\/noscript><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"729\" src=\"https:\/\/thetibble.com\/wp-content\/uploads\/2023\/03\/Inches-required-to-achieve-R40-for-different-types-of-insulation.jpg.webp\" alt=\"\" class=\"wp-image-30944 lazyload\" srcset=\"https:\/\/thetibble.com\/wp-content\/uploads\/2023\/03\/Inches-required-to-achieve-R40-for-different-types-of-insulation.jpg.webp 1000w, https:\/\/thetibble.com\/wp-content\/uploads\/2023\/03\/Inches-required-to-achieve-R40-for-different-types-of-insulation-300x219.jpg.webp 300w, https:\/\/thetibble.com\/wp-content\/uploads\/2023\/03\/Inches-required-to-achieve-R40-for-different-types-of-insulation-768x560.jpg.webp 768w, https:\/\/thetibble.com\/wp-content\/uploads\/2023\/03\/Inches-required-to-achieve-R40-for-different-types-of-insulation-960x700.jpg.webp 960w, https:\/\/thetibble.com\/wp-content\/uploads\/2023\/03\/Inches-required-to-achieve-R40-for-different-types-of-insulation-150x109.jpg.webp 150w\" sizes=\"(max-width: 760px) calc(100vw - 24px), 720px\" data-pin-media=\"https:\/\/thetibble.com\/wp-content\/uploads\/2023\/03\/Inches-required-to-achieve-R40-for-different-types-of-insulation.jpg\" id=\"mv-trellis-img-4\" data-trellis-processed=\"1\"><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Sources<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.tfofl.com\/how-insulation-works\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.tfofl.com\/how-insulation-works<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.energy.gov\/energysaver\/insulation\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.energy.gov\/energysaver\/insulation<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.energystar.gov\/campaign\/seal_insulate\/identify_problems_you_want_fix\/diy_checks_inspections\/insulation_r_values\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.energystar.gov\/campaign\/seal_insulate\/identify_problems_you_want_fix\/diy_checks_inspections\/insulation_r_values<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Insulation can be a tricky thing to work with, especially when trying to understand different thicknesses. R40 insulation is not the most common insulation out there, but it is worth &hellip;<\/p>\n","protected":false},"author":59,"featured_media":24758,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"disable-in-feed":false,"article-schema-type":"","disable-critical-css":false,"footnotes":""},"categories":[615],"tags":[618,627,637,177,629,628],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>R40 Insulation Thickness Guide (Table for All Types) - The Tibble<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/thetibble.com\/r40-insulation-thickness-guide\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"R40 Insulation Thickness Guide (Table for All Types) - The Tibble\" \/>\n<meta property=\"og:description\" content=\"Insulation can be a tricky thing to work with, especially when trying to understand different thicknesses. 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