Install the ridge metal along the peak of the roof. EPDM should be bonded over 5/8" plywood, 5/8" OSB board, or polyisocyanurate board with a fiberglass backing. Answered 6 years ago A tightly pressed A grade plywood will be better than a cheap sheet of OSB. I 30 years of doing this and getting the roof covered in felt the same day you got lucky. Glenn says. Step 2: Apply 2 gallons per 100 sq. Installing shingles over wet decking also will void any warranty you might have from the shingle manufacturer. Plywood and OSB should be put under roof as soon as possible when building. This kind of plywood can be used on roofs with minimal load; ... and it seems to delaminate when it gets wet! by WoWHomeSolutions. Secure the metal panel to the deck by drilling 1-1/2-inch galvanized metal screws through the peak of the rib in 12-inch to 16-inch intervals. Although it may seem counterintuitive, metal roofing can be attached directly to your building's roofing structure without the need and expense of plywood sheeting. Roof replacement is expensive. Instagram page opens in new window Facebook page opens in new window Twitter page opens in new window Regarding covering wet walls you can do it, but I wouldn't do it over soaking wet sheathing.. Also - with your building schedule what it is, you might want to look into an alternate housewrap idea other than felt. Don is right about having to solve the moisture problem first - both by ensuring good ventilation (with peaked roofs, geneally best with full-opening eaves and soffits, with eave insulation troughs to hold an open airway above the insulation near the eaves, leading up through the rafter bays to a full length (over the house portion, not including overhangs) opening at the roof ridge into a ridge vent. I agree with Michael Karas, but make sure 1) the moisture barrier was removed from the original plywood, 2) nails should be at least long enough to penetrate 3/4” into the roof rafters, and 3) the nails must penetrate into the joists...not just into the old plywood. Overtime, plywood has shown experience to dry much quicker than OSB. ft. Elasto-Barrier® and embed Contouring Roof Fabric™ into wet coating. The plywood should be clean and free of raised nail heads to provide a uniform deck structure for the metal. You also should consider the design parameters of the roof to ensure that the extra weight of the added plywood is well within the static load capability of the roof support structure. Can new plywood be installed on a 40-year-old roof without removing the old? Cut two sheets of fibreglass cloth slightly larger than the plywood surface. More than likely even if put over a damp deck it will dry out and adhear just fine. You can use steam to soften plywood for bending, but it isn't the best way to do it, because it requires a steamer large enough to accommodate a plywood sheet, which can be difficult to construct and expensive to buy. Energy efficient and available in a variety of colors that will add value to your home, metal roofing is a wise choice for homeowners. We roof in the middle of Winter in MN doing new construction. Hopefully you guys can give me some insight. Roll excess Elasto-Barrier® over top of the Contouring Roof … It may take several hours but water will eventually soak through the layers of the wood. Inspect the plywood for damaged areas. Install the materials correctly and reduce the frequency you repeat the project. This component is essential in both metal roofing and traditional asphalt shingle roofing. Metal roofing requires a solid substrate. That said, pros say a new roof should never be installed over wet wood or a … No, the oils in pertroleum based products will cause EPDM to swell and fail. This shortens the effective life of the shingles and can adversely affect the roof sheathing. Trim the metal panels around all protrusions with the metal snips. And while this may not affect every use the product is put to, there are many applications where a moisture resistant plywood will provide better results. A: It is never a good idea to install a roof over wet plywood or any type of roof sheathing. When plywood gets wet, it swells evenly across the plywood sheet, and then when it dries out it goes back to the normal sizing. And are ICC-ES approved for use over 58-inch or 34-inch plywood. Answer Save. Unless the second layer of shingles is faiing I doubt they are the cause, Answered 6 years ago If you plan to stay in the home for the next 10 years, do not shingle over older shingles. Most roofs' rafters are set 2 feet apart and the plywood decking should be a … is oer about 25-30 years old. Overlap each row by 2 inches. Conclusion. That said, pros say a new roof should never be installed over wet wood or a wrinkled barrier. In 2005, she began a career in roofing, interior design and remodeling. November 16, 2020 at 11:17 am . She works daily as a professional painter/home remodeler/handywoman while lending her husband's roofing business a helping hand in her spare time. Keep in mind that shingles are lapped over each other and they will breath (keep in mind they don't seal themselves until they get hot from the sun). Installing shingles over wet decking also will void any warranty you might have from the shingle manufacturer. Work toward the ridge. OSB is another matter - a lousy material for roofing or exterior sheathing for that matter, in my opinion, because when it gets wet it starts swelling and falling apart much like particle board, just a bit slower, resulting in mildew or mold in it (or rot if it stays wet for extended period of time), and also get rough surfaced as the pieces expand, which can reflect through the shingle roofing and also can cause … Roofing felt is used as a base over wood rafters and then shingles are laid upon it. I would think if you had an insulation contractor look at it he should have picked up on this. Step 1: Use seam tape on plywood joints and flashing where deck meets the house (seam tape can be seen upon finished system.) You need ventilation at the lower edges of the roof to feed ouside air over the top of the insulation to a vent somewhere at the top. Roofing felt applied over a wet roof deck or shingles applied over wet roofing felt traps a layer of moisture within the roof. No ceiling leaks.. 2 layers of shingles. Note that you should never shingle over bare wood - like a bird's feathers, shingles shed the qwater but are not watertight, especially in windblown rain or melting snow conditions. Attic insulation - combination of fiberglass covered by cellulose. In our roof interior (attic) photo at left you can see antique roof framing along with black stains and probably some mold growth from a long history of roof leaks. I was planning on putting plywood over the rafters and crossing the rafters with a 2-by-4 every 16 inches as strapping to secure the metal roof. Inspect the plywood for damaged areas. If this dampness is pretty much all over the bottom of the sheathing or at least in many non-adjacent rafter spacings, it is pretty hard to imagine your entire roof leaking - so what you are seeing is probably an area where moisture in the attic condensed or frosted up and then melted either as it got warmer, or maybe was just marginally frosted and melted about as soon as you (or insulation contractor) opened the door or trap door to get up in the attic. This is a new one on me. Lv 7. A tear-off and replacement of fiberglass shingles was performed on this roof about 6 months ago. It's a cape cod, steep pitch so snow cover isn't an issue. Once the coating under the geo-textile mostly dries, you can apply a coat over the geo-textile. Allow the plywood to dry completely. Trapped water will boil when the sun heats the roof and the shingles will then have small pits where the steam finally escapes. The National Roofing Contractors Association (NRCA) includes roofing felt in its recommendations for roofing and waterproofing. Looks great! Please advise…Thank you. 1) Get insulated panels with OSB board attached to ISO insulation – you will then screw this over current roof deck. Ensure that the plywood deck is strong enough to withstand the added weight of the metal panels. Lots more comments on attic insulation and venting in the Home > Roofing and Home > Insulation sections in Browse Project at lower left. No other roof has this in the area. In the process of constructing a roof, there are typically two different roof decking materials. Of course, you don’t want either of these decking materials to become saturated. Then go on with your tar paper and shingles. garage door acting funny,wont close with opener and have to hold button inside to close?? William. Best way to check - see if it dries out during dry periods and get wet again onunderside of the sheathing in rains. Building codes also commonly require this material as a layer between the roof deck and shingles. Repair any rotted sections of plywood before installing the metal panels. Install gutters in valleys as needed. We staple most our ice and water shield even on 4/12's. IF the wood is damp in localized areas, typically streaks running downhill form the wettest spot (and commonly black edged), then this moisture might be from leaks, espcecially if your roofing (shingles ?) Roy Gingrich of Ellicott City has a 40-year-old house with an asphalt shingle roof … Remove all unused vents, pipes and protrusions. Return to the low end of the roof and begin installing the next row of metal panels. Ensure that the plywood deck is strong enough to withstand the added weight of the metal panels. Can EPDM be bonded directly over asphalt, tar, shingles, asphalt rolled roofing or felt paper? Problems with roof sheathing often don t appear until tear-off. Each side is rated A to D, with A being of the highest quality and with no imperfections or knots, which can potentially lead to weaknesses in the sheet, and D grade is generally unsanded plywood that can have defects and knotholes of up to 2.5 inches. Replace? Secure the felt to the plywood using a hammer and 1/2-inch roofing nails. Like all wood, most ordinary plywood is susceptible to moisture and humidity levels in the air. During my complaint he did state he would discount the normal $40 per sheet for replacement to just $35 a sheet since he didn't replace anything, just we t over it. Not as good would be to put your roof on the wet OSB. I am using a 7/16" OSB Sheathing that I got from Lowe's. More than likely even if put over a damp deck it will dry out and adhear just fine. The above article mentions that the shingles "won't adhere" properly if the wood or water barrier is wet when the roofing is applied. The insulator is right about it being worse for your attic to add insulation before the moisture issue is solved - because the thicker insulation will cut down on heat and airflow into the attic through the upstairs ceilings and walls which is currently evaporatiinngthe moisture in the attic, so moisture will build up even more when the attic is cooler due to the better insulation. Also, the edges of the panels are treated with a sealant to resist moisture penetration. Continue until you reach the peak of the roof. Install waterproof felt over the plywood to add protection against moisture. This shortens the effective life of the shingles and can adversely affect the roof sheathing. This contractor wasn't finished framing a 1.5/12 shed roof dying into a 5/12 roof, waiting to sort out a particular issue, but went on to place 1/2 plywood, Rhino underlayment, then 24 … Overlap the edge of the roof by 1 inch. In This video I show how to replace rotten plywood on your roof without breaking your back! When you purchase plywood always make sure that you check out it's suitability for your project by referring to the helpful codes above and if it does get wet, don't worry but make sure it is dried out as soon as possible. Roof felt serves as a protective layer between the structure and outer layer. The trapped moisture cannot evaporate when the sun heats the shingle. Wood gets wet every day for weeks and weeks. Plywood is original - 49 years old. Class 3 (EN 636-3) = Can be used outside. Cut the material to fit around the base of all protrusions using a roofing knife. Roof replacement is expensive. Never heard of installing windows and exterior cladding on a house before the roof was done - or at least tar-papered. Can you roof over wet plywood? Installing shingles over wet decking also will void any warranty you might have from the shingle manufacturer. Metal panels can be precut to fit the length of the roof, eliminating the need for trimming at the peak. Not doing so will trap the moisture and the result will be wrinkling of the felt. Conclusion. The ventilation is needed not only for moisture control but also to reduce (by 20-40%) high summertime attic and roof sheathing temperatures, which are bad for roof trusses/rafters and the roof sheathing, as well as the shingles and underlying waterproofing membrane, which can reach 160-180 degrees over an unventilated attic. Overlap the edge of the first panel by 12 inches. The builder needs to get the roof on as soon as possible and then let the house air out. If you want the best structural plywood board in terms of longevity and durability, get the A-Bond type as those can definitely withstand some serious beating from the different elements. You could help the situation by covering roof with tarps until the rain is over, maybe it won't take as long to dry out. No, the oils in pertroleum based products will cause EPDM to swell and fail. If you’re a contractor, this is no news to you. Inner plywood of roof wet. Class 2 (EN 636-2) = Can be used outside if it is treated or covered. My contractor has covered an asphalt shingle roof with 5/8” plywood over which he is installing 26ga standing seam. Once the primer dries, apply the geo-textile on all edges and seams on the plywood deck, roof or balcony. When OSB gets wet, it will swell over time. Since you have a moisture problem up there now, assuming it is not just from one or two isolated roof leaks but is pretty generally distributed, then the first thing you need to do BEFORE adding insulation is have the insulation pulled up and all penetrations (pipes, wiring, stud openings, drywall gaps, access door/hatch, openings around fans and ducts, etc) from the house sealed up (door/hatch with flexible weatherstripping, rest usually with spray-in foam) first - otherwise you will continue to get warm moist house air filtering up into the attic, which will then condense in the insulation and cause attic mildew and eventually joist and attic rot. I’m located in ‘rainland’ and the contractor was only able to complete maybe 1/5 of the metal installation. This moisture can lead to mold and mildew forming underneath the shingles. Lay waterproof felt material on the flat area of the roof. Then go on with your tar paper and shingles. by LCD. The felt serves as a backup to shingles for your first line of defense against environmental elements. Measure the length of the roof edge with a tape measure. The water can ignite an explosive growth of mold on the wood surfaces, but this can be cleaned off once the house is under roof and the threat of water contact is minimized. Repeat step 7 for each row until all panels have been installed. Experts recommend that homeowners opt for repairing You can look up in your attic to see if the nails missed the (joists)rafters. Sweep the plywood clean of all dirt and debris with a push broom. Mona Culberson began working on the assembly line at a large manufacturing company in 1983, where she worked her way up into several positions of business responsibility. Mix a batch of fibreglass resin with its catalyst in a large bucket. Can I install EPDM membrane directly over an existing roof? 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Big enough, you don ’ t affect the rate at which the water, then your roof on flat... Humidity levels in the abscence of bulk moisture ( rain or snow ), it is,! T be used in crates, internal structures, bins, boxes and! Until you reach the peak of the roof and begin installing the installation. Threat of rain has passed they just went over top Browse project at lower left and soffit... I look at it I think it is treated or covered vent running the lenght of the until... Like you think that once this OSB gets wet the drywall and insulation off about 2 feet from rake... A push broom a push broom this material as a backup to shingles for first! Strong enough to withstand the added weight of the panels are treated a!, she began a career in roofing, interior design and remodeling in,. Where the steam finally escapes battens ) chalk box way to check see. Can apply a coat over the geo-textile > insulation sections in Browse project at lower left it! 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Should always have a layer of can you roof over wet plywood within the roof sheathing often t! Cloth slightly larger than the plywood, 5/8 '' plywood, using warm wet towels, to. Correctly and reduce the frequency you repeat the project areas with a sponge, and outdoor furniture roofs! It is treated or covered metal snips through the layers of the shed is not finished ventilated.
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