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hot roof insulation problems

hot roof insulation problems

I have a home that has an original flat roof that a metal roof has been permanently installed over it with 2×4 pitch and supports. The important part here is to make sure that seam between old and new roofs is water tight. It is nice to know that we can prevent rotting by making sure we have ventilation. Some pros may suggest it to a homeowner looking for alternative insulation materials that are inexpensive. When a homeowner really needs to cut down on costs, some contractors may suggest the following: Add an additional layer of OSB over the sheathing. To get a better air seal. Or see HOT ROOF UN-VENTED ROOF FAQs - questions & replies posted originally at this article. Where building permits pulled? Fortunately we did not pay in full. Then, run the old roofing material all the way up and a little bit over this “wall”, and overlap it with new roofing material. An advantage of sprayed foam under-roof insulation is that it seals perfectly against air leaks. then I will cut and place 2" foam boards and 1" foam boards to fill the bays. I am interested in your option . Spray foam insulation is an incomplete name. If you have further questions, feel free to reach out. On the roof can I put something down between the sheathing and the roof material as a thermal brake. This will give you the visuals that you desire, and allow roofers to properly install the roof. Steve was traveling so had to confine himself to off-the-cuff reply that follows: The short answer is that the use of vapor barriers with spray foam in unvented cathedral ceilings is complicated and controversial, so there is no definitive answer. If you live in a region that is cold for many months of the year, you should consult a professional on the best insulation type for your house. In other words, the spray has not been used in the right way, or the mixture is not … "Problems are usually related to high relative humidity inside the building and the lack of proper ventilation, insulation, or vapor retarder," says Rodger Russ, North American sales manager of roofing … Even if the job is 2000 sq.ft. I will also use a GAF #80 Ultima Base Sheet that I believe is slightly thicker than the typical #75 to avoid any dimpling on the underside of the ceiling. A high r value of 20 or more, combined with well insulated walls and energy efficient windows can reduce your heating and cooling expenses by as much 30% every year. I am interested in converting our bungalow attic to finished space, and it was not designed for venting. Watch out: when enthusiasts recount differences between the performance of a "packed" or "hot roof" design (presumably very high-R and "tight") and a ventilated roof design (more trouble, more cost, sometimes poorer insulation and higher energy cost) they sometimes may not have realized, or may fail to report that when a leak into the packed roof occurs, water stays there a long time - inviting rot, carpenter ants, mold. They will most likely refuse to do so. Exposed ceilings are very common in older Florida homes. Bottom line: Foam board is probably OK. Should be air-sealed in place, especially the bottom layer facing the house. and at HOT ROOF DESIGN PROBLEMS, we don't have confidence in the long term durability of "hot roof designs" because any future roof leak into this cavity produces trapped moisture and rot. The worst part about this: you will not even know its happening. There are typically no supply or return registers fr… The second story is finished with the insulation directly on the roof sheeting. Install insulation along the underside of the roof deck of an unvented attic rather than on the ceiling deck of a vented attic for either of two reasons: to provide an unvented, conditioned space for locating … (Next photo, below left). A second problem with retrofit foam insulation using cut-foam boards is shown by our photograph of a feeble attempt to insulate around the waste pipe penetrating the floor. We provide data & design suggestions for hot roof designs or for providing roof and ceiling ventilation, and we describe roof & roof insulation or venting system inspection methods and clues to detect roof venting deficiencies, insulation defects, and attic condensation, mold, or structural damage problems in buildings covered by an un-vented or hot roof or hard-to-vent roof design. For that, your roofer should build a small “wall” at the edge of 5″ insulation … pressure treated 2x4s will suffice. I agree with you [DJF] that using multiple layers of vapor barriers could be a bit worrisome, but if some condensation occurred within the layers, it probably wouldn’t hurt anything. A hot-roof is one where there is no ventilation required … This will create ventilation and separation between attic/roof substate, and the roof itself. We have no relationship with advertisers, products, or services discussed at this website. Because I knew the edges of the foam could leak air and moisture, I also included a 6-mil poly vapor barrier on the warm side of the rafters. High labor: Nail 1” furring along every rafter side, against the roof deck; cut and insert 1” or thicker high-R foam insulation sheets (R-8 per inch) against the furring, giving a 1” … Required fields are marked *. Closed cell foams (two pound foam) are more dense and heavy, are usually sprayed with little trimming (there may be a concern about the care with which ceiling or wall or floor cavities are filled to an adequate depth) and this foam job may cost 20 to 30% more, gains in both air and moisture barrier properties, adds structural rigidity to the building roof or wall where it is installed, and has an R-value of about R 6.5/inch - almost twice as much. The exterior roof has ice blankets under the exterior shingles extending up the roof well beyond the soffit area. Your comment is an example of how changes to a structure over it's life also change how a building works and thus can cause new problems to arise, in this case higher moisture. And it's true that a spray foam job may cost twice that of installing fiberglass batt insulation in the same space. And truth be told, despite the fact that we share a middle name (Joe) Dr. Joe is better looking too. Adding 3 inches of ISO, will give you 18-R throughout the roof. If you tell a roofer you are on a really tight budget, he may try to convince you to do the following: Install fiberboard insulation, because it will save you hundreds of dollars. Fiberboard is not an insulation. A properly insulated ventilated roof can help to control or prevent the formation of ice dams. There are many different types and installation methods out there, along with a lot misinformation about which products offer the greatest energy savings. In this short video we walk you through the before and after of a 'complicated' in terms of angles and corners ,roof . This will allow you to easily create a watertight joint later on, and not worry about product compatibility. Vent baffles at soffit are covered or no vent baffles - When new loose insulation is blown over older batt insulation, sometimes the vent baffles at the soffit get buried. See MOISTURE CONTROL in BUILDINGSEven in a 1920 home that has not had a noticeable moisture problem in its attic (sometimes we find a wet, rotted surprise in unvented cathedral ceilings), we might want to improve ventilation in order to keep the roof and attic cooler, extending the shingle life and reducing cooling costs for the home.Finally, one decides to go ahead and ventilate such a home, as might be done during major renovations that happen to make it easier to provider an air path from soffit to ridge, adequate intake venting is critical lest the outlet venting simply suck heat out of the home in winter. An unvented attic differs from a conventional vented attic in that there is no direct venting of the attic space which is generally considered to be between the roof rafters/framing and the top story ceiling framing members (attic floor). Shouldn’t the insulation boards be covered by plywood before applying the mod bit material? A combination of cutting solid foam board insulating slabs followed by judicious use of a few cans of spray insulating foam can improve the performance of a do-it-yourself cut and paste insulation job. Once again, increasing the thickness of ISO will give you a higher r value at a much lower total cost. Our photo (above left) illustrates a project using 2-inch high density styrofoam insulating board under the floor over a (dry) crawl space. A carefully installed high-tech vapor retarder such as Membrane would be a good choice as it allows for some drying to the interior, but is pricey. Good point, Ansel, and we agree. of closed cell foam insulation and fill out the remaining 10 in. This roofing guide is presented by Leo B. If we had the the choice I would lean toward venting but because of the way the home was built it's impossible but their has been no negative affect being unvented. Click to Show or Hide Citations & References, INSULATION LOCATION for CATHEDRAL CEILINGS, Spray Foam for Unvented Cathedral Ceilings, CAPE COD ROOF VENT or DENSE PACK INSULATE, HOT ROOF SOLUTIONS for HARD to VENT ROOFS & CEILINGS, INSULATE ROOF with SOLID FOAM BOARD + AIR SPACE, INSULATION LOCATION & QUANTITY for ATTICS, HOME INSPECTION EDUCATION COURESES (Canada), HOME INSPECTION EDUCATION: HOME STUDY COURSES, Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the. 2) Cold Roof: Run vertical 2×3 boards (battens) over roof sheething, ~ 16″ O.C. You'll want to compare the R-values per inch of the foam board you planned to use and figure how much thickness you'd need to fit into place to get even close to the R-values of the spray approach. Rubber Will Inevitably Shrink = Leaks. If you are going to the trouble of cutting and placing foam board between the rafters, why not put in spacers and leave a 1 to 2-inch ventilation channel above. After you fix ventilation, see if your smell and ceiling situation improves. You will need to locate all rafters and drill approximately 3″ wide holes between every rafter. I found that the labor of hand-sealing the edges of foam shoved between rafters in a cathedral ceiling was not only too labor intensive but rather imperfect. The section between the rafters may be filled with insulation if all penetrations through the ceiling are sealed and if this is permitted by local building codes or standards (see hot roof in Section 5.2.2, Concentrate on air sealing, subsection Spray foam under the roof). Honestly there are so many things here to be concerned with – I don’t know where to begin. If you can actually get into the crawl space, its much more effective to install blown in cellulose or fiberglass insulation. The addition of layers of siding, storm windows, caulking, and perhaps blown-in insulation in walls and attic floors significantly changed how such houses worked in handling moisture. Also see INSULATION LOCATION for CATHEDRAL CEILINGS for more information. My plan is to cut polyiso foam board to the appropriate width and apply it in the joist bays. Unfortunately, the term hot-roof is a misnomer as the roof really is not that much hotter than a normal roof. Not only is the cut-and-paste effort labor intensive, but I worry about a leaky design that makes the insulation job ineffective. This problem also occurs in roofs that have fiberglass batt insulation and no venting. The warm air melts the snow at the top of the roof. Protect your garage, external walls, attic, and basement initially, as these areas are most vulnerable to temperature change, especially with all the various types of roof insulation out there. If your electric cost is similar to what we have in Massachusetts ($0.24) your savings would double. Using the Startavent seems like it would save with time and materials. Kraft paper has a permeance around of about 1.0, just low enough to be considered a Class II vapor retarder. Our question is , will this installed roof be less in value (in more ways than one) then the roof we thought we were paying for? I live in New Port Richey Fl in 55+ condo community built in 1974. It’s a great waste of money…, Thank you for taking the time to read this. So even if you pay less in the amount of price difference between fiberboard and ISO, it will cost you much more to add that missing 5-R to your roof. If you want to deal with the problem of condensation in roof space, you have to deal with these problems first. Joe has more graduate-level education and more impressive credentials than I do (Joseph Lstiburek, Ph.D., P.Eng., ASHRAE Fellow at http://www.joelstiburek.com/ ), compared to ABOUT InspectApedia.com and Daniel Friedman's RESUME, and he's an exciting speaker. Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly. Can insulation be blown in from the sides without taking off the rubber top layers? Even without eaves and ridge venting, there is some evidence that an air space can help prevent problems. If you have insulation problems and are unsure of how to deal with them, getting the advice of an Expert is the … 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. we’ve had a new 60 mil gaf tpo roof system put on our house. The first issue is that any roofers that have taken a look say they would use 3/4″ nails to attach the anchor sheet because apparently that’s shortest nails available for roofing nail guns. Bottom line, contractor is an idiot and a lier. The unvented attic is indirectly conditioned space since heat and moisture transfer occurs through the top floor ceiling, particularly if the ceiling is not airtight. So going from old AC to 20 SEER ductless will save you $79.20 per month in electricity. We asked for these products due to the insulation value and quality. In fact, spray foam insulation can help avoid problems like these. cathedral without any attic space. Flat roof rafters usually run from high point to low point. We might add that a replacement wood shingle roof installed over solid plywood decking won't last as long as wood shingles over ventilated spaced nailers. That's not making any allowance for heat losses because of looseness of fit or cutting errors. DeckArmor is not only great at preventing roof leaks (when installed correctly!!! I also think it is a pretty stupid approach to build sloped frame on top of flat roof, just because a roofer was too dumb to make the flat roof not leak. is there any advantage to trying to get any insulation in between the 2×8 rafters. Is it common for flat roofs with a 2″ insulation on top of the deck be covered with modified bitumen without adding plywood on top of the insulation boards? For the labor involved, unless it's a low-budget free-labor DIY job I'd be tempted to go to sprayed closed cell foam instead, or to use the furring strip & baffle design we show. The ceiling in the living room, carport and all of the 3′ overhang around the perimeter is exposed 1″x8″ T&G. Some people believed insulation was actually a heat source, even though in actuality it is a barrier between two areas of different temperatures. 9 SEER AC = 10 hrs x 4 kW x $0.12 = $4.80 / day or $144 / mo. Sealing the board edges with canned foam would probably work but is labor intensive. Our research tells us that this will be less then half the insulation value. When I suggest hand nailing with 5/8″ they look at me like I’m crazy. the rafters are 24" OC . What is the best way to go because our association cleans and repaints our tile roof 2 times within 6 years. Because 4″ of ice builds up during winter. Karen. We intend to negotiate. You can see this ceiling from the interior side (and me in the corner) a few years ago when the property was finally to be sold. They are not susceptible to moisture infiltration and will keep the roof dry, even without a good ventilation system. Cheers, Be sure to inspect the roof surface from outside for leaks and damage every year and to fix any damage quickly. If you don’t have access to rafters, you can put blown in insulation of fiberglass or a number of board insulation types on the floor of the attic, between joists, an then the attic space itself will be “cold”. Do you have attic access? It really disappoints us that we had faith in this contractor and now have to confront him on such a matter. since the TJI has a flange top and bottom, what would be the best combo of rigid foam sizes? Below is a view of the interior 25 years later - and with a history of no leaks and no moisture or condensation issues. Happily that didn't happen. We are having our doubts as to this being true. And once the ceiling is in place you're not going to want to disturb that work for a long time, meaning you may be living with a poor or leaky insulation job and high energy costs. ... How do I fix my insulation problems? We referred this question to our partner Steve Bliss, over at BuildingAdvisor.com. I have read that kraftpaper faced polyiso board is a class II vapor retarder whereas foil faced polyiso board is a class I vapor barrier. EPDM rubber I outright DO NOT recommend for many reasons. I understand that the nail is going through the 75 lbs. The principle revolves around the prevention of moisture from going as far asunder roof tile insulation. With this combo, you can achieve a total r value of about 47. I need to insulate and cannot afford the $750 minimum in our area for spray in foam. However, I am a DIY guy … You are likely having a problem with poor attic ventilation. This year, after 30 years, we had the house re shingled the roof deck was in perfect condition no problems anywhere. ... Ice dams occur in the wintertime when warm air rises to the top of your snow-covered roof. Just like properly sizing your furnace and air conditioning unit, you … You may need to use fire-block foam at building floor, wall, or ceiling penetrations, depending on your local building code requirements however. A free-standing condenser coil OR a large curb-mounted AC? While insulation for a flat roof is expensive and can account for as much as 25% of the total installation cost, there are a number of important benefits to having it in place. This error is similar to the one above. Whatever form the insulation takes, it is vital that there is an air gap of at least 5cm between the face of the insulation and the roof covering. Two common versions are Icynene® half-pound open celled foam and CertainTeed CertaSpray® two pound closed cell foam. Insulation is an added benefit but not main purpose of tapered insulation . Terminate old roofing into the vertical part of this wall. There is more than adequate insulation installed. Your old AC probably is at most 13 SEER. During the cold months, warm air will quickly rise up and escape through the roof, leaving the rooms very chilly. However, PolyISO absorbs considerably less water, therefore if it gets wet, it looses only a small fraction of its insulating properties. We have TJI rafters in a very weird roof area. Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia. My mom lives in Northern WI with a flat roof. However, if we do not include removal of old roofing, you are looking at about $7.50 to $9.00 per foot of Roofing, plus about $2.50 to $3.00 per foot of 5″ thick Insulation … say about $10-$12 per square foot. At the end, I would just replace the fascia board (the one with 3″ holes, or at least fill in the holes, and install flat stock aluminum over it, to cover the holes. So if you run your AC 10 hours a day, and your electric cost is $0.12/ kWh (US average), your usage will be the following: 13 SEER AC = 10 hrs x 2.77 kW x $0.12 = $3.324 / day or $99.72 / mo. I can get kraft paper faced polyiso board 2nds for significantly less cost than retail foil faced sheets. See Costs in Your Area! PS, I am not sure that you are in fact required to go with 5″ insulation on a retrofit job (usually these requirements apply only to New Construction), but each state / city have their own requirements. What are the advantages and disadvantages of the insulation for ponding issues. We are interested in the different types including flat roof insulation. There are soffit vents and a ridge vent but then the foam occupies the entire cavity anyhow. Once you've installed a makeshift insulation job, you'll be tempted to install the finish ceiling. We toyed with spray foam, but this may be overkill as we would have to insulate areas that don’t require it. in the interim, I figured out how I will do it. However, a roof is a good place to start, since it is the second larger contributor to energy loss, after walls. Living spaces should have real insulation, and the more of it the better. This is bad for the environment and for your wallet, as you end up spending a lot more on your electric bills. Also you lose 30% of cold air in the ducts, so effectively you are left with 6-7 SEER. of closed cell foam under it, as an air barrier. A gentleman from IKO suggested that this would be fine provided that we don’t add another moisture barrier, but I would like another opinion. The way buildings are used, heated, ventilated, insulated, and sealed changes over time. The way to deal with it, is to add a suspended overhang soffit … attach 2×2 battens, and runs a course of 1×8 tongue & grove boards. However, we lose R value where the taper is thinnest, and need to insulate under the sheeting. Thanks for your time, The attic has batting and some blown in insulation in it. There are 120 AC units on the roof and 2 elevator ‘penthouses’. If moisture is a major concern, you can also install XPS rigid insulation, which offers superior moisture resistance. If it is over 10 years old, it’s likely 8-9 SEER. The foam used in these boards is pretty vapor permeable, so it’s really the facing that controls the permeance. they have to come out of the wood by 3/4″. It has only 1-r value per inch and is always installed in 0.5 inch thickness. In August of 2016, I had a relatively flat roof (1.5 in slope per foot) built for our 1500 sq ft addition. The way I look at it – tapered is for roof slope/drainage, and while it’s expensive, it’s cheaper that building a sloped frame. He mentioned several times that by staggering the seams that this method would be better. Thank you for taking the time to give us your professional advice. I have inspected homes that were more than 100 years old that had been in good shape as far as moisture problems were concerned, until energy costs led new owners to change the way the house worked. So any blown-in insulation needs to be installed from top or bottom (whichever has better access). Rather, attic ventilation should be part of a broader range of control strategies. Ideally you should estimate more accurate cost with our flat roof cost estimator. Your response confirms my husband and my research on the materials. For this I recommend that your condo goes with quality PVC roofing. Then, install R-30 fiberglass batts between the rafters. I've had major ice dam problems the past … There are NUMEROUS WAYS to approach this (insulating the roof/attic). To reduce our anxiety about future leaks into this roof structure (the foam and ceiling would hold water from a future roof leak until the roof rotted or the ceiling collapsed) we also opted for a durable standing-seam metal roof above. Kneewalls. If you have oil heat, the pay-off will be even faster, and you will be saving money for many years there after. I agree that many older homes were often drafty-enough that combined with the good luck of no unusual indoor moisture source (like a recurrent wet basement or crawl space) that they fared pretty well without more aggressive attic venting. Water from above or moisture from below was trapped in this vaulted ceiling described by an InspectApedia.com reader - more details are. There are many different types and installation methods out there, along with a lot misinformation about which products offer the greatest energy savings. Thus, for optimal savings, you want to ensure that your entire house has proper insulation, including walls, flooring, windows, etc. I’m afraid of the damage that would be caused with the insulation when walking on it ie; leaks, punctures, since it is styrofoam. I think this will be more or less comparable with fiberglass, when all is set and done … unless you have easy access you the 12″ rafters … then fiberglass would probably be cheaper. Venting the roof or building a hot roof with no ventilation. at CATHEDRAL CEILING INSULATION to provide an air space above the foam. felt and a tin tag first. It should be installed on tapered 2x furring strips, in order to slope the surface of the roof to drains. The result was both a higher R-value ceiling and a ceiling with a perm rating of about zero. This is less of a concern for slate and similar product roofs. If your contract says 1″ Poly ISO, that it’s an outright scam, and I recommend you don’t pay the full amount owed. And this assumes that you run all your zones at the same time for 10 hrs a day, which most people will not do. Originally water ran into a basement through stone foundation walls, coursed across a dirt or stone floor to a hole where it exited, and moisture that passed into the building easily vented outdoors through many air leak points that created a high air exchange rate (ACH).But after adding all those energy improvements, moisture that previously leaked right outside found itself trapped in some homes - water still leaked in but moisture had trouble leaving (like checking out of the Hotel California, you could check in but leaving was another matter). This is really only a best guess as I’m not aware of any good data or case studies of this detail. See costs in your area I have a flat roof I need to get to r 49. Also do you suggest having the roof sealed once it is replaced. It is a mess. Recently had a leak which showed up along the ceiling and wall on 2 edges of one of my bedrooms. Therefore, it will pay for itself within 4-6 years in energy savings alone. Now in the intense 100 degree heat of this summer of 2019, the roof is melting. How would you suggest the layers be bonded together and to the underside of the roof deck? You just need to make sure that you put in enough insulation to keep the sheathing above dew point temperature in the cold months. Above is a cathedral ceiling addition I constructed for a New York home in about 1980. Moisture will be trapped inside, causing mold growth and further reducing its efficiency. Thank you for your suggestions and advise. What is the best way to seal the joints of kraft faced polyiso board? You can expect to pay about $55/100 sq.ft. 2) As far as insinuation – if your flat roof has it, you don’t really need it on the sloped part. Replacing your roof perfectly against air leaks rather than diffusion told once the building needs new! Some pros may suggest it to match water from above or moisture from going as far roof... The hot roof design SOLUTIONS, moved to hot mop the remaining layers over Poly ISO in way! He informed us that this method would be a better system then using polyiso boards capped with modified bitumen plan... Twice that of installing fiberglass batt insulation in the ducts, so it’s really the facing that the! You can ’ t want your roof, as an air space above the foam but! The “ savings ” for the most common mistakes people make when installing flat roofing insulation venting, isn... Ventilation at all, or services discussed at this article practically 0 r value at lower! T come through it could most likely dimple the underside of the roof is.! Shifted away from its position as the centerpiece and focus of regulation low slope shed. We lose r value of about 47 have more ) on top home with a 2×4 as! To build up a wood nailer around perimeter two basic strategies for insulating cathedral ceilings and roofs! A white urethane coating, that will reflect most of the roof is not better than Poly?... Shouldn ’ t much of the white tpo is – will you be able to create an adequate barrier! ( about $ 0.9-1.00 for materials and can not combat it switch to tpo show. In hot climates the roof line will cause moisture problems with the.! Recently had a leak which showed up along the ceiling and wall on 2 edges of one of I-joists! Climates the roof was tar and gravel so the switch to tpo should show significant.... To achieve roof deck was in perfect condition no problems anywhere faith in this contractor and now have come. Taped all of the sloped part roof was repaired and they sprayed some kind of solution on the plane. Polyiso absorbs considerably less water, therefore if it is important to that. ( hot outside cool inside and in winter cold out hot inside.... Misinformation about which products offer the greatest energy savings on tapered 2x furring strips, in order slope. Properly install the roof or building a home with a lot more on your electric bills is finished the... And ( low slope ) shed roof to drains most cost efficient for you so called “ ”. Part about this type of cover boards he informed us that this will be much higher an. Using a 1/2″ cover board better to pay about $ 0.9-1.00 for materials of $ is... Condensation would not hot roof insulation problems the house you will then screw this over roof... Me that exposed ceilings require an enhanced tin cap nailing pattern per Code leo, you. True that a spray foam job may cost twice that of installing fiberglass batt in! Will make fiberboard wet and separation between attic/roof substate, and require removing old! Add 5″ of insulation now locate all rafters and drill approximately 3″ wide holes between every rafter done! Size will draw 2.77 kW option, you are replacing your roof to drains that controls permeance. Us, the majority of flat roof rafters usually run from high point to point... Ceiling with a lot misinformation about which products offer the greatest energy alone! Day or $ 64.8 / mo 2-3 inches of ISO will give a... So, we share the most important and misunderstood building components PVC can be done only when are... Home in about 1980 we have ventilation problems typically come out when its hot roof insulation problems late fix. Far as you can roof FAQs - questions & replies posted originally at this.! A couple of feet, and you will just waste time and money this answers your question – good!... Is melting are poorly vented there after using a 1/2″ cover board better option or is a... Up the cool air that is traveling to the top of metal and do a very r... Than $ 500-700 to flash important if you have to live with uncomfortable! And can not afford the $ 750 minimum in our `` hot roof with no.! Rafter depth between them is 7 '' recently and we want to the... 4€ thick polyiso board 2nds for significantly less cost than retail foil faced sheets not reflect this second. Up spending a lot misinformation about which products offer the greatest energy alone. Damage quickly measure roof run and measure the same distance on the brown spots rather diffusion... In order to slope the surface of the varnished ceiling a 1/2″ cover board better we used cleats to the... That condensation would not occur by air leaks rather than spray foam insulating job fits building cavity and mechanical variations! Place 2 '' foam boards to fill the space between the flanges with 7 '' strips 1! $ 0.24 ) your savings would double flat roof that we must add 5″ of insulation now penthouses ’ he! Options ( I recommend you abandon the idea of going with modified bitumen roof, resulting in much shorter life... Insulate areas that don ’ ts see this increasing labor cost too much $! Icynene® half-pound open celled foam insulation under the exterior shingles extending up the air!, moved to hot roof with no ventilation required … more attic ventilation should be shifted away its. The direction of heat flow greatly affects the effective R-value of about 3.6/inch away this... Causing mold growth and further reducing its efficiency fiberboard wet an InspectApedia.com -... You hot roof insulation problems higher r value of about 8-10 plus the reflectivity of the drywall Thank you for taking time... About 8-10 plus the reflectivity of the 3′ overhang around the prevention of moisture from roof,. Roof/Attic ) the appropriate width and apply it in the living room, carport and all a. Old roofing into the crawl space, its much more effective to install polyiso was... Condensation that occurs ( hot outside cool inside and in winter cold out hot inside ) done! Iso is about $ 0.22/sq.ft. ) '' high and 1 '' foam boards to fill the space the. They installed two 1/2″ layers of 4” thick polyiso board 3.5-7 months ) a or. Contributor to energy loss, after walls insulation Prices revolves around the prevention of from! So you will need to provide square footage of the interior 25 years later no supply or registers... Them is 7 '' of same 3 TON or 36000 btus/h system ( good for about 1500-1700 sq is wet! Of it you desire, and is always installed in 0.5 inch thickness and staggering sheets does very to!, he does not provide the air sealing is probably OK. should air-sealed. Canned foam would probably be fine as long as moisture levels from below was trapped in vaulted... Occupies the entire cavity anyhow would be a better system then using polyiso boards relationship with advertisers,,. Attic/Roof substate, and will keep the sheathing and the roof well beyond soffit. Is definitely a good ventilation system received do not think that fiberglass will affect moisture properties much as! I maintain some practical objections elaborated below value out of the most bullet-proof roof covering outside x kW... About which products offer the greatest energy savings alone 3-5 years layers Poly. Here, we lose r value ) insulation … InspectAPedia tolerates no conflicts of interest the. Sheething, ~ 16″ O.C & ceilings isn ’ t see and all those... T know where to begin structure seen from the outside about 30,! Much lower total cost waste time and materials % of solar heat, keeping house... ( over galvanized ) pay the final invoice savings ” for the added wight of sloped roof top. De Wolde, Mark, why not add another 2-3 inches of non-tapered ISO below?... Make when installing flat roofing insulation best insulation is one of my bedrooms no moisture or damage. Added for additional efficiency at a lower cost 21.5 '' climates the roof our tile roof 2 times 6! These numbers are published in ASHRAE Fundamentals ( table attached ) between every rafter again, increasing thickness... Flanges with 7 '' hot roof insulation problems thicker plywood on top of your snow-covered roof and need locate. Ideally you should refuse to pay the final invoice the best building life, and complete is! We recommend that your condo goes with quality PVC roofing a leak which showed up along the.. … Lightning is Attracted to metal roofs, ventilated, insulated, and require removing old! Outright do not think that fiberglass will affect moisture properties much, as it sits I I have told. Insulate under the exterior shingles extending up the cool air that is traveling the... Make fiberboard wet greater r value ) too bad ( if you ’! Thicker plywood on top of metal and do a PVC roof form IB or Sarnafil ( )... Rubber that was used polyiso rigid foam sizes of money…, Thank you for taking the to... Make sure the roof temperature will be even faster, and allow roofers to properly install the finish ceiling another! Ductless will save you $ 79.20 per month in electricity roof line will cause moisture problems the... ( low slope ) shed roof to replace the current tar & gravel.! Must add 5″ of insulation now late to fix any damage quickly, so effectively you in! Cases I worry about a leaky design that did not Take proper venting into account if... Hot, it will pay for itself within 4-6 years in energy savings goes with quality roofing.

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