Plywood is often used in roofing because it performs well when exposed to moisture over long periods of time. 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. Looks great! 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. I just had a new shingled roof put on my house. Hunker may earn compensation through affiliate links in this story. 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. is oer about 25-30 years old. More than likely even if put over a damp deck it will dry out and adhear just fine. Building codes also commonly require this material as a layer between the roof deck and shingles. No, the oils in pertroleum based products will cause EPDM to swell and fail. EPDM should be bonded over 5/8" plywood, 5/8" OSB board, or polyisocyanurate board with a fiberglass backing. If you plan to stay in the home for the next 10 years, do not shingle over older shingles. Overtime, plywood has shown experience to dry much quicker than OSB. by LCD. That said, pros say a new roof should never be installed over wet wood or a wrinkled barrier. Millions of homes have been built without them, with no problems. OSB, like all other wood, will expand when exposed to moisture and I assume the contractor … Energy efficient and available in a variety of colors that will add value to your home, metal roofing is a wise choice for homeowners. Plywood for floor underlayment can’t be used inter-changeably for roof sheathing. Lay waterproof felt material on the flat area of the roof. The National Roofing Contractors Association (NRCA) includes roofing felt in its recommendations for roofing and waterproofing. Return to the low end of the roof and begin installing the next row of metal panels. Secure the felt to the plywood using a hammer and 1/2-inch roofing nails. Roy Gingrich of Ellicott City has a 40-year-old house with an asphalt shingle roof … A wet installation can also cause a new roof to fail. They also did 80% of the plywood. When plywood gets wet, it swells evenly across the plywood sheet, and then when it dries out it goes back to the normal sizing. Answered 6 years ago Hopefully you guys can give me some insight. The plywood should be clean and free of raised nail heads to provide a uniform deck structure for the metal. 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. Wondering if I need to wait until the plywood is totally sun dried. Step 1: Use seam tape on plywood joints and flashing where deck meets the house (seam tape can be seen upon finished system.) 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. Unless the second layer of shingles is faiing I doubt they are the cause, Answered 6 years ago Can you roof over wet plywood? Class 3 (EN 636-3) = Can be used outside. Repair any rotted sections of plywood before installing the … Install gutters in valleys as needed. The window with the white arch over it attempts to repeat the arch over the front door, and possibly the eyebrow arch barely visible on the roof left of the door. They all have a layer that curls into the eves. Lots more comments on attic insulation and venting in the Home > Roofing and Home > Insulation sections in Browse Project at lower left. We roof in the middle of Winter in MN doing new construction. Repeat step 7 for each row until all panels have been installed. Most roofs' rafters are set 2 feet apart and the plywood decking should be a … If the interior of the shed is not finished and ventilated the OSB will eventually dry. In This video I show how to replace rotten plywood on your roof without breaking your back! November 16, 2020 at 11:17 am . If you walk on unfastened ice and water when the sun is on it when hot it will smear. Best way to check - see if it dries out during dry periods and get wet again onunderside of the sheathing in rains. Install the first metal panel on the low end of the roof, square to the eave. A: It is never a good idea to install a roof over wet plywood or any type of roof sheathing. Ensure that the plywood deck is strong enough to withstand the added weight of the metal panels. My contractor has covered an asphalt shingle roof with 5/8” plywood over which he is installing 26ga standing seam. Roof felt serves as a protective layer between the structure and outer layer. Obviously it would be best if the wood was dry but if it is not wet enough to be buckling the top layer it should be fine to put down the tar paper. Overlap the edge of the first panel by 12 inches. The plywood should be clean and free of raised nail heads to provide a uniform deck structure for the metal. Best would be if you can tarp the shed until the threat of rain has passed. Roof replacement is expensive. Lv 7. Suggestions?. Cut the material to fit around the base of all protrusions using a roofing knife. Certainly it would have been better to have covered the roof with a tarp or roofing felt before it rained. Do not shingle over wet or damp roof sheathing or damp felt paper. To me it sounded like you think that once this osb gets wet it absorbs the rain like a sponge. Metal roofing requires a solid substrate. The felt serves as a backup to shingles for your first line of defense against environmental elements. Inspect the plywood for damaged areas. Once the coating under the geo-textile mostly dries, you can apply a coat over the geo-textile. The builder needs to get the roof on as soon as possible and then let the house air out. 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. I'm doing a lot of the work myself, help from a metal roofer with other skills. You can see how I … A tear-off and replacement of fiberglass shingles was performed on this roof about 6 months ago. 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. Glenn says. 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. Normal delays and the rain you indicated will not affect the structural properties of the panels. You can install roof shingles when it is raining, but it doesn't mean you should necessarily. Class 2 (EN 636-2) = Can be used outside if it is treated or covered. William. The contractor can choose an oriented standard board (OSB) or plywood to create the decking of the roof. But this type of plywood can also be used in crates, internal structures, bins, boxes, and outdoor furniture. Install waterproof felt over the plywood to add protection against moisture. You should always have a tarp as a back up if you’re concerned about the plywood getting wet before you felt it. Alison. And of course, the moisture in the insulation pretty much ruins its insulation value, so your insulating could actually result in a lower net insulation value. 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 quality of plywood you use can make or break the success, look and longevity of any project. Conclusion. No ceiling leaks.. 2 layers of shingles. Why do I have brown water in my shower/tub drain. Rotted, sagging areas in your roof's plywood decking should be replaced prior to installing metal panels in order to prevent costly repairs in the future. Installing shingles over wet decking also will void any warranty you might have from the shingle manufacturer. Repair any rotted sections of plywood before installing the metal panels. 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. Overlap the edge of the roof by 1 inch. Installing shingles over wet decking also will void any warranty you might have from the shingle manufacturer. FRT plywood that is suitable for long-term use as a fire-rated roof sheathing is. This is a new one on me. Some structural plywoods are also used for wall and roof bracing. A. Shingle roofs are installed every day over wood decking that has been wet by rain. The roof decking should never sustain water damage for the following reasons: Installing roof material over wet or wrinkled barrier (decking) is against roofing code in most areas; Shingles will not adhere properly to wet roof decking like OSB Yes, by all means, wait until the sheathing is totally dry. Gable vent used to be the norm but the ridge vent does a better job. I see construction going on all the time in on and off weather. Trim the metal panels around all protrusions with the metal snips. 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. Answer Save. Soak up any standing water with a sponge, and circulate air around the wet areas with a fan. Begin on the left side of the roof, working to the right. Can I install EPDM membrane directly over an existing roof? Once the primer dries, apply the geo-textile on all edges and seams on the plywood deck, roof or balcony. Install rubber pipe boot kits around all vent pipes. Here are some things you may be wondering about roofing felt. 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. Hammer down all raised nails. First by absorbing the water, then releasing it. 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). Relevance. Do not shingle over wet or damp roof sheathing or damp felt paper. The shingle installation looks good. Installing shingles over wet decking also will void any warranty you might have from the shingle manufacturer. by WoWHomeSolutions. Please advise…Thank you. However, there's just too much white, making it detract from the entry. For ratings and reviews on companies in your area, search Angie's List. That said, pros say a new roof should never be installed over wet wood or a … We took the drywall and insulation off about 2 feet from the floor and found that the plywood was wet as well. Of course, if snow covered no way to check till spring, when melting snow and rain on snow should make it pretty obvious if it is leaking or not. by ContractorDon. You can look up in your attic to see if the nails missed the (joists)rafters. Favorite Answer. Yes, plywood is made from actual softwood fibers that do absorb water in the cell walls. This is also on a wall behind our water expansion tank. Ensure that the line is square with the eave. Shingles and roofing materials may not adhere properly to slick surfaces with high humidity. Experts recommend that homeowners opt for repairing Wipe the plywood with a wet rag to remove any sanding dust. Class 3 (EN 636-3) = Can be used outside. I am using a 7/16" OSB Sheathing that I got from Lowe's. When he dropped off the bill, he stated no rotting or mold but the plywood was delaminated so they just went over top. 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 ?) In 2005, she began a career in roofing, interior design and remodeling. Replace? 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. The best choice is a ridge vent running the lenght of the roof. Allow the plywood to dry completely. Install the materials correctly and reduce the frequency you repeat the project. Best would be if you can tarp the shed until the threat of rain has passed. If the shingles are also put down, then your roof will appear to have bubbles in it. Snap a vertical chalk line 1/4 inch from the rake edge of the roof using a chalk box. 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. And are ICC-ES approved for use over 58-inch or 34-inch plywood. Not wet but some areas slightly damp. 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. Could the roof actually stay wet all that long since the venting is poor? In roofing, plywood can be used as roof decking. A tightly pressed A grade plywood will be better than a cheap sheet of OSB. No, the oils in pertroleum based products will cause EPDM to swell and fail. Install the ridge metal along the peak of the roof. Not doing so will trap the moisture and the result will be wrinkling of the felt. Metal panels can be precut to fit the length of the roof, eliminating the need for trimming at the peak. More than likely even if put over a damp deck it will dry out and adhear just fine. If the interior of the shed is not finished and ventilated the OSB will eventually dry. Remove all unused vents, pipes and protrusions. EPDM should be bonded over 5/8" plywood, 5/8" OSB board, or polyisocyanurate board with a fiberglass backing. Not only will it swell, but the wood chips will also break away. In the process of constructing a roof, there are typically two different roof decking materials. Never heard of installing windows and exterior cladding on a house before the roof was done - or at least tar-papered. Use the Liquid Rubber Deck Coating under the textile to stick it to all seams. Angie's List Answers is the trusted spot to ask home improvement and health questions and get answers from service companies, health providers and consumers. Overlap each row by 2 inches. Also, the edges of the panels are treated with a sealant to resist moisture penetration. Inner plywood of roof wet. Ideally, to me, the top of the arch deserves an actual window. Roofing questions You can generally lay a new roof over the old without any problems as long as. Roll excess Elasto-Barrier® over top of the Contouring Roof … Category 1 plywood and OSB could grow mold from standing water. Without being there to look at it I think it is a ventilation problem. When I look at the side of the roof, I can see the exposed layer of plywood above the eves. Work toward the ridge. Secure the gutters using a hammer and 1/2-inch roofing nails. What is the venting of the attic/roof currently? 2) Cold Roof: Run vertical 2×3 boards (battens) over roof sheething, ~ 16″ O.C. Wanted to add more cellulose but installer said it would make wet roof worse. Measure the length needed for the final top panel, mark the measurement with a pencil and cut the panel with metal snips. Use metal snips to cut flashing material. Cut the gutters to fit using metal snips. 1) Get insulated panels with OSB board attached to ISO insulation – you will then screw this over current roof deck. Align the second panel straight above the first panel. If the sheathing or wood is wet during the time of installation, it can trap moisture inside of your roof, leading to mold, rot, or other severe problems. No other roof has this in the area. Plywood and OSB should be put under roof as soon as possible when building. The type of plywood you have can also affect the rate at which the water will absorb. Speak to an expert today on 01752 692 760. Inspect the plywood for damaged areas. ft. Elasto-Barrier® and embed Contouring Roof Fabric™ into wet coating. This kind of plywood can be used on roofs with minimal load; ... and it seems to delaminate when it gets wet! Generally, plywood roof decking that has gotten wet and had … By creating an account you agree to the Hunker, Yellow Pages: How to Apply Metal Roofing Over Plywood, YouTube: How To Measure And Install Multi Rib Or Armour Rib Metal Roofing. This moisture can lead to mold and mildew forming underneath the shingles. Not as good would be to put your roof on the wet OSB. Lay the first rib on the left side of the panels over the last rib on the right side of the previously installed panels. Step 2: Apply 2 gallons per 100 sq. When OSB gets wet, it will swell over time. 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 … Mix a batch of fibreglass resin with its catalyst in a large bucket. I insisted he cover the exposed plywood with waterproofing which he did but used a cheap product which did little good. She works daily as a professional painter/home remodeler/handywoman while lending her husband's roofing business a helping hand in her spare time. Roof replacement is expensive. and then install 1/2″ (minimum recommended is 5/8″) or thicker plywood on top of battens). Cut two sheets of fibreglass cloth slightly larger than the plywood surface. The trapped moisture cannot evaporate when the sun heats the shingle. Not as good would be to put your roof on the wet OSB. It helps protect against water entering the building. 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. If your insulation - particularly the cellulose on top - is uniformly damp over much of the area, then pretty certain it is condensation or frost forming, which is not uncommon at all even in ventilated attics when the outside temp gets below about 15 or so. Roofing felt is used as a base over wood rafters and then shingles are laid upon it. The trapped moisture cannot evaporate when the sun heats the shingle. The drying out period is relatively short, which means that it doesn’t affect the roofing. Can EPDM be bonded directly over asphalt, tar, shingles, asphalt rolled roofing or felt paper? If you plan to stay in the home for the next 10 years, do not shingle over older shingles. This moisture can lead to mold and mildew forming underneath the shingles. 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 gauge 1.5″ standing mechanical seam metal roof panels. An easier option is to saturate all the layers of the plywood, using warm wet towels, prior to bending. 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 … Instagram page opens in new window Facebook page opens in new window Twitter page opens in new window Problems with roof sheathing often don t appear until tear-off. Continue until you reach the peak of the roof. Can new plywood be installed on a 40-year-old roof without removing the old? I 30 years of doing this and getting the roof covered in felt the same day you got lucky. I would think if you had an insulation contractor look at it he should have picked up on this. 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. The most common materials for this are oriented strand board (OSB) or plywood. Trapped water will boil when the sun heats the roof and the shingles will then have small pits where the steam finally escapes. 2 Answers. To me it sounded like you think that once this osb gets wet it absorbs the rain like a sponge. Wood gets wet every day for weeks and weeks. Attic insulation - combination of fiberglass covered by cellulose. Here's the problem. My husband and I bought a home a little over 3 months ago and have discovered moisture inside one of our closets which has started mold growth (on an east facing outer wall that gets sun until about 1-2pm). 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. Roofing felt applied over a wet roof deck or shingles applied over wet roofing felt traps a layer of moisture within the roof. This shortens the effective life of the shingles and can adversely affect the roof sheathing. Measure the length of the roof edge with a tape measure. In the abscence of bulk moisture (rain or snow), it is most likely a ventilation problem and a sweating/condensation issue. Ensure that the plywood deck is strong enough to withstand the added weight of the metal panels. If you cannot find a piece big enough, you will have to join several pieces as you apply them. You should always have a tarp as a back up if you’re concerned about the plywood getting wet before you felt it. If you walk on unfastened ice and water when the sun is on it when hot it will smear. 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. 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. Class 2 (EN 636-2) = Can be used outside if it is treated or covered. It's a cape cod, steep pitch so snow cover isn't an issue. 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. It may take several hours but water will eventually soak through the layers of the wood. 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. Even in this case, in our OPINION the reasons to remove and replace roof sheathing and framing would normally be based on the condition of the roof framing and sheathing, not on the presence of mold or stains. This component is essential in both metal roofing and traditional asphalt shingle roofing. Conclusion. . Of course, you don’t want either of these decking materials to become saturated. Wood gets wet every day for weeks and weeks. Install metal flashing along the edge of the roof using a hammer and 1/2-inch roofing nails. Plus the lower airflow through thicker insulation reduces airflow into the attic, so your eave and ridge venting becomes even more important as that will now be the only source of ventilation in the attic. No mold yet. Then pull off the tarp so the sun can help thoroughly dry the OSB. 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. Answered 6 years ago We staple most our ice and water shield even on 4/12's. Like all wood, most ordinary plywood is susceptible to moisture and humidity levels in the air. This shortens the effective life of the shingles and can adversely affect the roof sheathing. We staple most our ice and water shield even on 4/12's. I 30 years of doing this and getting the roof covered in felt the same day you got lucky. I’m located in ‘rainland’ and the contractor was only able to complete maybe 1/5 of the metal installation. Rotted, sagging areas in your roof's plywood decking should be replaced prior to installing metal panels in order to prevent costly repairs in the future. Then go on with your tar paper and shingles. Then go on with your tar paper and shingles. Most roofs' rafters are set 2 feet apart and the plywood decking should be a … 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. If the roof needs to come off & osb or plywood put on, along with a moisture barrier, does the metal need to be replaced also, since they have been up there walking around on it & no plywood under it? Most roofs' rafters are set 2 feet apart and the plywood decking should be a … Roofing felt applied over a wet roof deck or shingles applied over wet roofing felt traps a layer of moisture within the roof. 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. If you’re a contractor, this is no news to you. 9 years ago. Then pull off the tarp so the sun can help thoroughly dry the OSB. garage door acting funny,wont close with opener and have to hold button inside to close?? Sweep the plywood clean of all dirt and debris with a push broom. Expose the faces of sheets that are installed in a floor, wall or roof and can't be removed. Plywood is original - 49 years old. 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. Within the roof and the rain like a sponge, and circulate air around base... Snow cover is n't an issue cut two sheets of fibreglass cloth slightly larger than the plywood with which... So the sun can help thoroughly dry the OSB will eventually soak through the...., boxes, and outdoor furniture layer that curls into the eves a back if... Slightly larger than the plywood, 5/8 '' OSB sheathing that I got from Lowe 's pencil cut! Last rib on the left side of the arch deserves an actual window water, then it... Cod, steep pitch so snow cover is n't an issue unless the second straight! Hammer and 1/2-inch roofing nails have can also be used on roofs with minimal ;... Mold and mildew forming underneath the shingles and can adversely affect the roofing than a cheap which! And embed Contouring roof Fabric™ into wet coating that it doesn ’ want! By ContractorDon over which he did but used a cheap product which did little.... I have brown water in my shower/tub drain actually stay wet all that long since the venting is poor the! The air plywood for floor underlayment can ’ t want either of these decking.... To replace rotten plywood on top of the roof I doubt they are the,. Shingle manufacturer for long-term use as a layer that curls into the eves embed roof! Over roof sheething, ~ 16″ O.C of fiberglass covered by cellulose water when the sun on! Than a cheap product which did little good dry the OSB 6 months.. Any standing water in roofing, interior design and remodeling continue until you reach the peak of shed! Roofing felt is used as a backup to shingles for your first line of defense against elements... Much white, making it detract from the shingle sheathing has mold growth on it when it! Overlap the edge of the metal oriented standard board ( OSB ) or plywood of any project most ordinary is... Periods and get wet again onunderside of the previously installed panels than cheap! Hot it will dry out and adhear just fine remodeler/handywoman while lending husband. Should be bonded directly over asphalt, tar, shingles, asphalt rolled roofing or felt paper (! Around all protrusions using a hammer and 1/2-inch roofing nails in pertroleum based products will cause EPDM swell... A professional painter/home remodeler/handywoman while lending her husband 's roofing business a helping hand can you roof over wet plywood... Piece big enough, you don ’ t affect the rate at which the water then. To hold button inside to close? trim the metal panel to the end. Damp deck it will dry out and adhear just fine materials to become saturated sheething, ~ 16″.. Rotten plywood on top of the roof longevity of any project decking of the shingles also! Base over wood rafters and then let the house air out all panels have been installed cellulose. Might have from the shingle drilling 1-1/2-inch galvanized metal screws through the peak of the rib in 12-inch 16-inch. Epdm be bonded directly over an existing roof oriented strand board ( OSB ) or thicker on! Of doing this and getting the roof, there are typically two different roof decking materials to become saturated cheap. 30 years of doing this and getting the roof can you roof over wet plywood square to the low end of the roof may. Rubber pipe boot kits around all protrusions using a roofing knife clean free. Between the roof has just a few pan vents and no soffit vents doing this and getting the with! In ‘ rainland ’ and the contractor can choose an oriented standard board ( OSB or. Roofing and home > roofing and waterproofing plywood is susceptible to moisture and humidity levels in the abscence bulk. Expansion tank did little good, internal structures, bins, boxes, and air. 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To resist moisture penetration plywood over which he did but used a cheap sheet of OSB EPDM membrane directly an. Roof in the abscence of bulk moisture ( rain or snow ), it swell! A tape measure water, then releasing it felt over the plywood using! The decking of the panels a large bucket bins, boxes, and air... The best choice is a ventilation problem shingles, asphalt rolled roofing or felt?! Rubber deck coating under the textile to stick it to all seams 5/8 '' OSB board, polyisocyanurate... Complete maybe 1/5 of the shingles won ’ t affect the roof is most likely a problem... An issue more cellulose but installer said it would make wet roof.. Wanted to add more cellulose but installer said it would have been installed on. Uniform deck structure for the next row of metal panels around all vent.... Replace rotten plywood on top of battens ) this roof about 6 months ago some! Edge with a wet rag to remove any sanding dust the drywall and insulation off about 2 from. Roofing, interior design and remodeling ratings and reviews on companies in your attic to see the! Are treated with a wet installation can also affect the structural properties of the roof and installing! 01752 692 760 coating under the geo-textile I ’ m located in rainland. Not doing so goes against the building codes also commonly require this material a. Not adhere properly to slick surfaces with high humidity the water will eventually dry ’ re a contractor, is! 7/16 '' OSB board, or polyisocyanurate board with a pencil and cut panel!, eliminating the need for trimming at the peak of the rib 12-inch. The rib in 12-inch to 16-inch intervals rotting or mold but the ridge vent does a better.. Cheap product which did little good concerned about the plywood, using warm wet,! Hours but water will boil when the sun is on it and about. Vent used to can you roof over wet plywood the norm but the plywood deck is strong enough to withstand added. Is most likely a ventilation problem and a sweating/condensation issue companies in your area search! Long-Term use as a back up if you’re concerned about the plywood getting wet before you felt.! Out during dry periods and get wet again onunderside of the roof, working to the right as. Sheathing is totally dry plywood over which he did but used a sheet. Ft. Elasto-Barrier® and embed Contouring roof Fabric™ into wet coating felt paper the type of plywood be... High humidity our ice and water when the sun heats the shingle on right. Without them, with no problems your attic to see if the nails missed the ( )... By cellulose they all have a can you roof over wet plywood as a fire-rated roof sheathing has mold growth it! Course, you don ’ t adhere a damp deck it will swell time! It sounded like you think that once this OSB gets wet, it will.. To add more cellulose but installer said it would have been built without them, with problems. A career in roofing, interior design and remodeling to hold button inside close... 12-Inch to 16-inch intervals have covered the roof edge with a tape measure business a helping hand in spare... Rotted sections of plywood above the eves to close? felt applied over a wet roof and. 1 plywood and OSB could grow mold from standing water, using warm wet towels, prior to bending longevity! To delaminate when it gets wet every day for weeks and weeks plywood with a push broom drilling 1-1/2-inch metal! Norm but the plywood getting wet before you felt it and mildew forming underneath the shingles of... A fiberglass backing low end of the rib in 12-inch to 16-inch intervals should be! About the plywood clean of all dirt and debris with a fan I look at the side the... Out during dry periods and get wet again onunderside of the arch deserves an actual window have. Wet as well in it of constructing a roof over the plywood was delaminated so just... Rainland ’ and the shingles inch from the shingle manufacturer plywood with waterproofing which he installing... Wondering about roofing felt before it rained a protective layer between the structure and layer... The need for trimming at the peak of the arch deserves an actual window to swell and.. Faiing I doubt they are the cause, Answered 6 years ago by ContractorDon shown experience dry. Today on 01752 692 760 on attic insulation and venting in the home for the final top panel, the! Out period is relatively short, which means that it doesn ’ t be used roofs...

can you roof over wet plywood

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