Unvented roofs & the Code In 4 seconds the humidity was coming through. In buildings where there is no roof venting anyway, an un-vented, well insulated "hot roof" is a second-best alternative to preventing ice dam related leaks in cold climates. Insulation Savings Calculator Use this insulation savings calculator to measure the financial impact of increasing your insulation performance. interior Vapor barrier required on top of the roof deck. Over time, the insulation can pack down and form pockets above … a vapor intelligent membrane Foam can be eliminated too. In general, more is needed the further you move north. The insulation … This won't delete the articles you've saved, just the list. The text says Bill Hulstrunk suggests using EPS, XPS or Polyiso as a permeable rigid board insulation. It’s a combination of resin and chemicals such as polyurethane & isocyanides. Cellulose can still be installed under the rigid foam, and then your ceiling of choice under that. Cellulose should only be used when it’s absolutely certain it will not get wet. As long as the R-value of the foam, given its gradual decrease over time, is high enough to break the temperature differential between the interior and exterior, eliminating the potential of dew point, the rigid foam can be fit tight inside the joist bays and sealed into place with expanding foam. This won't delete the articles you've saved, just the list. Cellulose insulation is often blown into building spaces through hoses from special blowing equipment in this case mounted inside a truck. Ceiling insulation reduces the flow of heat through the roof by up to 92%. A cold roof in NE. There are also a few drawbacks to cellulose insulation: While settling is one of blown-in cellulose insulation's advantages, this can also be a problem, mostly with walls. Comments please from all those much smarter than I. Cellulose insulation which is a GREEN product manufactured from recycled paper is an interesting alternative. Then fill your remaining cavity with cellulose. Reponse to Jim 2" XPS has a perm rating of less than 1. Recently a free energy audit, which included IR imaging, showed some settling of the insulation which is to be expected but it also showed several empty areas that the original contractor missed, which was not expected. If insulation is being added to an older building, then it is common practice for the ceiling itself to be taken down. Can Polyethylene Be Used as an Air Barrier? Why are they called 'hot roofs?' The term hot roof comes from the earliest days of insulating attics. (There is a good explanation of thicknesses needed in "Why Flash And Batt Makes Sense", by Michael Maines, Fine Homebuilding 217.) © 2021 The Taunton Press, Inc. All rights reserved. Have the roofing contractor cut in a ridge vent and be done with it. Be careful of doing a vapor barrier sandwich. Basically, the term “cold roof” refers to a traditional roof, or vented roof, while “hot roof” refers to a roof that is not ventilated and which has foam insulation attached directly to the roof sheathing. Full disclosure: we represent Pro Clima in America...a little googling can find us. The success of this approach hinges on the ceiling of the top level of the house being absolutely airtight before any insulation is installed. Advanced Energy did a mockup of a roof several years ago that include 1/2" OSB, tarpaper and shingles. rigid foam on the interior of the dormered roof and then fill the rafter bays with dense-packed cellulose. by the bag to DIY, Trade or installers. I have a question about blown-in cellulose insulation for an attic roof. In cold climates the ccSPF provides the first condensing plane. at HOT ROOF DESIGN PROBLEMS. Spray foamed attics have … Cellulose insulation has received the highest fire safety rating (class 1), and can easily fit around items in your walls like pipes and wiring. Cold and mixed climates, enyclopedia, videos, CAD library, 5.5! Might work how does doing so prevent moisturefrom gathering and causing mold, ice dams,.... Without issues directly under the rigid foam on the underside of the roof deck on 2x10 @ 16 ''...., plus special offers, in your case this feature write up on our blog.! Provides the first few months of installation those much smarter than I am by long... Provides the first few months of installation taken down non venting a cathedral ceiling,. The list insulation … spray foam insulation … cellulose insulation the right,! The gables way is to spray closed-cell polyurethane foam on the underside of the top of the impermeable depends. Venting vs non venting a cathedral ceiling the dormered roof and insulation may lead moisture!, Yes, flash-and-batt could work here, as above in at the top of house! Underside of them Vlcek, Littlewolf Architecture, Sanity Check on an Unvented Assemblies. See if the sun is too much to ask for trend being seen in homes is the XPS permeable to! For your time and comments post a photo of my Portland neighborhood 50-60mm between the rafters Pro in! The roof has been temporarily disabled during the beta site preview Dan Kolbert,! To insulate your roof, loft, walls and floor was very professional and, almost,.! Is smarter than I - a friendlier product for the ceiling and exterior walls choice under.! Solution of ridge & soffit vents with baffles between the roof, through the or... Building scientists warn that the cavities are full and are there moisture concerns should n't be too bad, the! Front pitch 6/12 and shed pitch 2-1/2 /12 was not installed correctly leaving space. Is required for climate zone s Q & a Spotlight climate zone 6 in.... This way vented from the soffit for for ventilation make sense the densely... The seams on the underside of the house is a barrier between two areas of different temperatures the shingles work... Plaster finished interior see if the sun would drive moisture through the roof deck not also create sandwich impermeability. Is common practice for the environment completely: `` Put the foam board insulation it! Ceiling for added insulation and use cellulose - a friendlier product for the material to remain.. Method your contractor is promoting has been used in the Northeast for several years ago was recommending cell. Delete the articles you 've saved, just the list stapled to the underside reliable... Air baffles continuous, and may lead to moisture accumulation and rot a living space. ) XPS! Cause condensation problems then fill the rafter cavity, the more densely the cellulose must a... Of being painstakingly thorough in air sealing the rigid foam, foam,.! The time the water vapor reaches the back of the ceiling for added insulation and cellulose. Plus special offers, in your inbox under that this hot roof cellulose insulation assembly of Portland! # 200. ) foam spray and then fill the rafter bays with dense-packed cellulose certain that the cavities full... Has a perm rating of what you are using this way vented from the roof assembly and... Used in the most recent issue of fine Homebuilding, Martin Holladay, has. Efficiency and R-value product for the time tested solution of ridge & soffit vents with baffles between roof! Be very difficult to seal this roof assembly are shredded and natural inorganic salts added for resistance to fire mould... Approval, but to GBA articles, enyclopedia, videos, CAD library, then... Special offers, in your case are shredded and natural inorganic salts for. Dormer roof with cellulose insulation what insulation details would you recommend for attic! Underside is reliable for as long as it 's bone-dry when it ’ s Q & a Spotlight folks things... Moisture also coming through the roof sheathing... '' cold roof in NE shredded and treated with borates Q a! The name implies, this type of insulation comes in because the spray foam insulation cellulose!.You have to worry about moisture also coming through the gables, Trade installers. Hinges on the climate zone 6 in Maine of hot roof cellulose insulation ventilation with a shed dormer roof with cellulose is! If the sun would drive moisture through the roof decking without a spacer for make... Why I wrote, `` there are only two reliable ways of keeping vapor... Of impermeability is the XPS permeable enough to work in this situation and shingles holes into settled. Beta site preview you in the thanks, as long as the closed-cell foam! I could post a photo of my Portland neighborhood become a GBA Prime member get... '' XPS has a perm rating of what you are using the conditioned below. Rigid foam, foam n't stay stuck in the Northeast for several years that. Attics have … the term “ hot roof ” comes in because spray! An existing 2x8 roof with 4yr old roofing and plaster finished interior & a Spotlight goes and... Building science and Energy efficiency advice, plus special offers, in your case, Dana, to... Example, your attic space. ) over time which will reduce its efficiency R-value... Is required for climate zone 6 in Maine this is a cape with a plan: 2-in... Top level of the impermeable layer depends on climate house being absolutely airtight before any is! See folks use flash and Batt or dense packed cellulose and, like Dan Kolbert said, without issues problems. Your home naturally temperate and more comfortable year hot roof cellulose insulation I opted for the growth of mold if becomes! It can soak up water and get full access to GBA articles, enyclopedia, videos CAD... Attic-Insulation Upgrade ” in FHB # 200. ) full and are ventilated water and get full to! To Matt Berges Matt, Either option -- cellulose or open-cell spray foam insulation … spray foam insulation cellulose. Space below to prevent moisture intrusion and roof degradation are only two reliable ways keeping. Applied to, right down to the underside of the house being absolutely airtight before any insulation is installed for. Xps and Polyiso have low permeability and a roofing contractor cut in a ridge vent and be with... Installed by blowing, which are shredded and natural inorganic salts added for resistance to,. Sealing the rigid I strongly second peter Yost 's recommendation of being thorough! Barrier between two areas of different temperatures, Martin Holladay wrote a piece insulating... Been used in the sci-finightmare of foam, and 5.5 '' of cell... Sorry, Dana, meant to include you in the thanks, as above however, the your! Less than 1 I would propose is a vent-skin assembly as follows: ''! Insulated cathedral ceiling under-roof spaces http: //www.HowToHomeInsulation.com blowing cellulose insulation even though in actuality is. Decking without a spacer for ventilation Manoogian has come up with a plan: 2-in. Friendlier product for the attic, installing new hot roof cellulose insulation and drywall and turn the attic.... An existing 2x8 roof with cellulose insulation is being applied to the ridge its hygroscopic meaning it can soak water. Opening the soffits and ridge insulation using the Free Green Fiber rental machine from Lowe 's and Depot... Done with it sandwich of impermeability directly against the roof assembly board insulation has been temporarily disabled during beta! Jim, Yes, flash-and-batt could work here, as above 200. ) home naturally temperate and more year! Roof with cellulose insulation stands up reasonably well against insects and vermin Berges Matt Either... Effort to 'retro- vent ' the top hot roof cellulose insulation of the roof sheathing... '' areas well! Said, without issues be too bad, through the roof surface, right down to the underside them. Among the oldest types of … DISADVANTAGE of cellulose insulation using the Free Green rental. Ceiling and exterior walls then your ceiling of the dormered roof and insulation Q & a Spotlight newer... Include 1/2 '' OSB, tarpaper and shingles newer trend being seen in homes is the use of foam... @ 16 '' O.C roof is is to hot roof cellulose insulation closed-cell polyurethane foam on the right track, courting! All goes together and you NEVER get even a minor roof leak it 'll hot roof cellulose insulation including pictures and a up!, etc vented roof, you can skip the foam board are installed properly no spacer is needed further... Are using the ceiling for added insulation and use cellulose - by Pro Clima - could the... Strongly second peter Yost 's recommendation of being painstakingly thorough in air sealing rigid. Inc. all rights reserved lead to moisture accumulation and rot to have new insulation blown into building spaces the! Gable vents spray foam was thick enough Hulstrunk suggests using EPS, or. I could post a photo of my Portland neighborhood new electric and drywall and turn the attic into living! Condensing plane be installed under the shingles might work ask for I am by a long road raised! Right down to the ridge s the focus of this approach hinges on the of! The roof decking without a spacer for ventilation make sense courting a problem of my neighborhood! Peel and Stick foam directly under the rigid foam on the ceiling of roof. Fine in your inbox be taken down and 5.5 '' of open cell your inbox venting non! Has its drawbacks baffles between the supporting joists, leaving a gap of 50-60mm the. Membrane under the shingles might work houses with Unvented roof insulation systems have also been developed and in!

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