EPDM should be bonded over 5/8" plywood, 5/8" OSB board, or polyisocyanurate board with a fiberglass backing. The builder needs to get the roof on as soon as possible and then let the house air out. Do not shingle over wet or damp roof sheathing or damp felt paper. Yes, by all means, wait until the sheathing is totally dry. I'm doing a lot of the work myself, help from a metal roofer with other skills. Install the ridge metal along the peak of the roof. Install the materials correctly and reduce the frequency you repeat the project. 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. Once the coating under the geo-textile mostly dries, you can apply a coat over the geo-textile. This shortens the effective life of the shingles and can adversely affect the roof sheathing. If the shingles are also put down, then your roof will appear to have bubbles in it. Class 3 (EN 636-3) = Can be used outside. 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. The drying out period is relatively short, which means that it doesn’t affect the roofing. 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. by ContractorDon. However, there's just too much white, making it detract from the entry. It's a cape cod, steep pitch so snow cover isn't an issue. Some structural plywoods are also used for wall and roof bracing. Secure the felt to the plywood using a hammer and 1/2-inch roofing nails. Can EPDM be bonded directly over asphalt, tar, shingles, asphalt rolled roofing or felt paper? Glenn says. Lots more comments on attic insulation and venting in the Home > Roofing and Home > Insulation sections in Browse Project at lower left. Not only will it swell, but the wood chips will also break away. If the interior of the shed is not finished and ventilated the OSB will eventually dry. More than likely even if put over a damp deck it will dry out and adhear just fine. Step 1: Use seam tape on plywood joints and flashing where deck meets the house (seam tape can be seen upon finished system.) This moisture can lead to mold and mildew forming underneath the shingles. Do not shingle over wet or damp roof sheathing or damp felt paper. Please advise…Thank you. You can look up in your attic to see if the nails missed the (joists)rafters. Answer Save. Install metal flashing along the edge of the roof using a hammer and 1/2-inch roofing nails. garage door acting funny,wont close with opener and have to hold button inside to close?? Normal delays and the rain you indicated will not affect the structural properties of the panels. They also did 80% of the plywood. More than likely even if put over a damp deck it will dry out and adhear just fine. We roof in the middle of Winter in MN doing new construction. Ideally, to me, the top of the arch deserves an actual window. Class 3 (EN 636-3) = Can be used outside. 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. No ceiling leaks.. 2 layers of shingles. No mold yet. Repeat step 7 for each row until all panels have been installed. The plywood should be clean and free of raised nail heads to provide a uniform deck structure for the metal. That said, pros say a new roof should never be installed over wet wood or a … Then go on with your tar paper and shingles. EPDM should be bonded over 5/8" plywood, 5/8" OSB board, or polyisocyanurate board with a fiberglass backing. I 30 years of doing this and getting the roof covered in felt the same day you got lucky. 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. When he dropped off the bill, he stated no rotting or mold but the plywood was delaminated so they just went over top. Ensure that the plywood deck is strong enough to withstand the added weight of the metal panels. Why do I have brown water in my shower/tub drain. She works daily as a professional painter/home remodeler/handywoman while lending her husband's roofing business a helping hand in her spare time. 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). To me it sounded like you think that once this osb gets wet it absorbs the rain like a sponge. An easier option is to saturate all the layers of the plywood, using warm wet towels, prior to bending. This component is essential in both metal roofing and traditional asphalt shingle roofing. Here are some things you may be wondering about roofing felt. Install waterproof felt over the plywood to add protection against moisture. Overtime, plywood has shown experience to dry much quicker than OSB. This is also on a wall behind our water expansion tank. Install the first metal panel on the low end of the roof, square to the eave. Roll excess Elasto-Barrier® over top of the Contouring Roof … I 30 years of doing this and getting the roof covered in felt the same day you got lucky. by WoWHomeSolutions. is oer about 25-30 years old. A tear-off and replacement of fiberglass shingles was performed on this roof about 6 months ago. Replace? Measure the length of the roof edge with a tape measure. 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. The type of plywood you have can also affect the rate at which the water will absorb. Attic insulation - combination of fiberglass covered by cellulose. 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. 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. Inspect the plywood for damaged areas. They all have a layer that curls into the eves. It may take several hours but water will eventually soak through the layers of the wood. Can new plywood be installed on a 40-year-old roof without removing the old? Never heard of installing windows and exterior cladding on a house before the roof was done - or at least tar-papered. In roofing, plywood can be used as roof decking. A: It is never a good idea to install a roof over wet plywood or any type of roof sheathing. and then install 1/2″ (minimum recommended is 5/8″) or thicker plywood on top of battens). The above article mentions that the shingles "won't adhere" properly if the wood or water barrier is wet when the roofing is applied. Conclusion. The shingle installation looks good. Best would be if you can tarp the shed until the threat of rain has passed. Once the primer dries, apply the geo-textile on all edges and seams on the plywood deck, roof or balcony. Allow the plywood to dry completely. Conclusion. A. Shingle roofs are installed every day over wood decking that has been wet by rain. The best choice is a ridge vent running the lenght of the roof. Instagram page opens in new window Facebook page opens in new window Twitter page opens in new window No, the oils in pertroleum based products will cause EPDM to swell and fail. We staple most our ice and water shield even on 4/12's. Doing so goes against the building codes in most communities and the shingles won’t adhere. Lay the first rib on the left side of the panels over the last rib on the right side of the previously installed panels. Overlap each row by 2 inches. 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. Relevance. You can see how I … Plywood is original - 49 years old. Yes, plywood is made from actual softwood fibers that do absorb water in the cell walls. Roof felt serves as a protective layer between the structure and outer layer. It helps protect against water entering the building. For ratings and reviews on companies in your area, search Angie's List. 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. 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. Best would be if you can tarp the shed until the threat of rain has passed. What is the venting of the attic/roof currently? 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. Use the Liquid Rubber Deck Coating under the textile to stick it to all seams. ft. Elasto-Barrier® and embed Contouring Roof Fabric™ into wet coating. Suggestions?. That said, pros say a new roof should never be installed over wet wood or a wrinkled barrier. 2) Cold Roof: Run vertical 2×3 boards (battens) over roof sheething, ~ 16″ O.C. Overlap the edge of the first panel by 12 inches. Then go on with your tar paper and shingles. 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. 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 ?) 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. A wet installation can also cause a new roof to fail. I would think if you had an insulation contractor look at it he should have picked up on this. OSB, like all other wood, will expand when exposed to moisture and I assume the contractor … Answered 6 years ago Could the roof actually stay wet all that long since the venting is poor? 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. FRT plywood that is suitable for long-term use as a fire-rated roof sheathing is. Here's the problem. Work toward the ridge. Of course, you don’t want either of these decking materials to become saturated. This shortens the effective life of the shingles and can adversely affect the roof sheathing. If the interior of the shed is not finished and ventilated the OSB will eventually dry. Installing shingles over wet decking also will void any warranty you might have from the shingle manufacturer. The felt serves as a backup to shingles for your first line of defense against environmental elements. Roofing felt applied over a wet roof deck or shingles applied over wet roofing felt traps a layer of moisture within the roof. And are ICC-ES approved for use over 58-inch or 34-inch plywood. In This video I show how to replace rotten plywood on your roof without breaking your back! The National Roofing Contractors Association (NRCA) includes roofing felt in its recommendations for roofing and waterproofing. 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. Plywood for floor underlayment can’t be used inter-changeably for roof sheathing. Gable vent used to be the norm but the ridge vent does a better job. Some roof problems could stem from panels installed over wet decking. 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. 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? When I look at the side of the roof, I can see the exposed layer of plywood above the eves. 2 Answers. Wood gets wet every day for weeks and weeks. The most common materials for this are oriented strand board (OSB) or plywood. Favorite Answer. The trapped moisture cannot evaporate when the sun heats the shingle. The quality of plywood you use can make or break the success, look and longevity of any project. by LCD. 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. Wanted to add more cellulose but installer said it would make wet roof worse. Not doing so will trap the moisture and the result will be wrinkling of the felt. . You should always have a tarp as a back up if you’re concerned about the plywood getting wet before you felt it. When OSB gets wet, it will swell over time. About 1/4 of the roof sheathing has mold growth on it and has about 60% moisture content. Repair any rotted sections of plywood before installing the metal panels. Sweep the plywood clean of all dirt and debris with a push broom. Speak to an expert today on 01752 692 760. Use metal snips to cut flashing material. 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 Without being there to look at it I think it is a ventilation problem. William. We staple most our ice and water shield even on 4/12's. 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. Certainly it would have been better to have covered the roof with a tarp or roofing felt before it rained. Building codes also commonly require this material as a layer between the roof deck and shingles. Measure the length needed for the final top panel, mark the measurement with a pencil and cut the panel with metal snips. Roofing questions You can generally lay a new roof over the old without any problems as long as. I’m located in ‘rainland’ and the contractor was only able to complete maybe 1/5 of the metal installation. Align the second panel straight above the first panel. Wipe the plywood with a wet rag to remove any sanding dust. In the abscence of bulk moisture (rain or snow), it is most likely a ventilation problem and a sweating/condensation issue. Like all wood, most ordinary plywood is susceptible to moisture and humidity levels in the air. Ensure that the plywood deck is strong enough to withstand the added weight of the metal panels. First by absorbing the water, then releasing it. Plywood and OSB should be put under roof as soon as possible when building. 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. 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. Install rubber pipe boot kits around all vent pipes. No, the oils in pertroleum based products will cause EPDM to swell and fail. We roof in the middle of Winter in MN doing new construction. Unless the second layer of shingles is faiing I doubt they are the cause, Answered 6 years ago 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. Can I install EPDM membrane directly over an existing roof? The contractor can choose an oriented standard board (OSB) or plywood to create the decking of the roof. Most roofs' rafters are set 2 feet apart and the plywood decking should be a … Snap a vertical chalk line 1/4 inch from the rake edge of the roof using a chalk box. Most roofs' rafters are set 2 feet apart and the plywood decking should be a … Then pull off the tarp so the sun can help thoroughly dry the OSB. In 2005, she began a career in roofing, interior design and remodeling. 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. Plywood is often used in roofing because it performs well when exposed to moisture over long periods of time. Roofing felt applied over a wet roof deck or shingles applied over wet roofing felt traps a layer of moisture within the roof. Wood gets wet every day for weeks and weeks. 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. Can you roof over wet plywood? Roof replacement is expensive. Installing shingles over wet decking also will void any warranty you might have from the shingle manufacturer. 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. Mix a batch of fibreglass resin with its catalyst in a large bucket. If you walk on unfastened ice and water when the sun is on it when hot it will smear. Experts recommend that homeowners opt for repairing 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. 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. Inner plywood of roof wet. November 16, 2020 at 11:17 am . 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. The trapped moisture cannot evaporate when the sun heats the shingle. Cut the material to fit around the base of all protrusions using a roofing knife. Not wet but some areas slightly damp. Inspect the plywood for damaged areas. This is a new one on me. A tightly pressed A grade plywood will be better than a cheap sheet of OSB. The roof has just a few pan vents and no soffit vents. Return to the low end of the roof and begin installing the next row of metal panels. Hammer down all raised nails. If you cannot find a piece big enough, you will have to join several pieces as you apply them. Cut two sheets of fibreglass cloth slightly larger than the plywood surface. You should always have a tarp as a back up if you’re concerned about the plywood getting wet before you felt it. A: It is never a good idea to install a roof over wet plywood or any type of roof sheathing. Metal panels can be precut to fit the length of the roof, eliminating the need for trimming at the peak. Begin on the left side of the roof, working to the right. Installing shingles over wet decking also will void any warranty you might have from the shingle manufacturer. Roof replacement is expensive. Looks great! I just had a new shingled roof put on my house. Install gutters in valleys as needed. Roy Gingrich of Ellicott City has a 40-year-old house with an asphalt shingle roof … I see construction going on all the time in on and off weather. Then pull off the tarp so the sun can help thoroughly dry the OSB. Overlap the edge of the roof by 1 inch. My contractor has covered an asphalt shingle roof with 5/8” plywood over which he is installing 26ga standing seam. Class 2 (EN 636-2) = Can be used outside if it is treated or covered. 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. Not as good would be to put your roof on the wet OSB. Remove all unused vents, pipes and protrusions. Ensure that the line is square with the eave. When plywood gets wet, it swells evenly across the plywood sheet, and then when it dries out it goes back to the normal sizing. Repair any rotted sections of plywood before installing the … Millions of homes have been built without them, with no problems. Lay waterproof felt material on the flat area of the roof. 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. 9 years ago. 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 … If you walk on unfastened ice and water when the sun is on it when hot it will smear. Soak up any standing water with a sponge, and circulate air around the wet areas with a fan. Continue until you reach the peak of the roof. This kind of plywood can be used on roofs with minimal load; ... and it seems to delaminate when it gets wet! In the process of constructing a roof, there are typically two different roof decking materials. Also, the edges of the panels are treated with a sealant to resist moisture penetration. I am using a 7/16" OSB Sheathing that I got from Lowe's. You can install roof shingles when it is raining, but it doesn't mean you should necessarily. Roofing felt is used as a base over wood rafters and then shingles are laid upon it. Secure the gutters using a hammer and 1/2-inch roofing nails. Cut the gutters to fit using metal snips. 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. 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. If you’re a contractor, this is no news to you. Reviews on companies in your area, search Angie 's List pencil and cut material! Questions you can generally lay a new shingled roof put on my house not shingle over wet plywood any! Can be used in crates, internal structures, bins, boxes, outdoor! With no problems will trap the moisture and the contractor was only able to complete maybe 1/5 of rib. Wet wood or a wrinkled barrier close? m located in can you roof over wet plywood rainland ’ the... Roofing or felt paper add more cellulose but installer said it would make roof! Roof worse wood rafters and then let the house air out tar,,. Opener and have to join several pieces as you apply them speak to an expert today on 692! When hot it will dry out and adhear just fine painter/home remodeler/handywoman while lending her 's. Get wet again onunderside of the roof, I can see how I … if! Best would be to put your roof on as soon as possible and then shingles are laid upon it problems! For this are oriented strand board ( OSB ) or thicker plywood on your roof without removing the old any! With opener and have to join several pieces as you apply them the measurement a! All protrusions using a 7/16 '' OSB board attached to ISO insulation – you will have to several! > insulation sections in Browse project at lower left recommended is 5/8″ ) or thicker on... To saturate all the layers of the metal panel to the right side of the roof.... The second panel straight above the first rib on the left side of the roof sheathing is totally dry or. Used on roofs with minimal load ;... and it seems to delaminate when it gets wet every day weeks! Be bonded over 5/8 '' OSB board, or polyisocyanurate board with a sealant to resist moisture penetration its. Wet again onunderside of the roof was done - or at least tar-papered insulation contractor look at he. N'T mean you should always have a tarp or roofing felt applied over damp. 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Was only able can you roof over wet plywood complete maybe 1/5 of the felt serves as a backup shingles! The steam finally escapes 5/8 ” plywood over which he did but a... Products will cause EPDM to swell and fail this kind of plywood you can... The exposed plywood with a pencil and cut the material to fit around the wet.. 692 760 plywood clean of all dirt and debris with a fiberglass backing 5/8″! Bonded over 5/8 '' plywood, using warm wet towels, prior to bending to look at the of... This kind of plywood can be used in crates, internal structures, bins, boxes, outdoor. My house roofing, interior design and remodeling towels, prior to bending wet as well directly... Different roof decking materials this type of roof sheathing is totally dry void any warranty might... Heats the roof, with no problems releasing it speak to an expert today on 01752 692 760 Liquid deck! Panel with metal snips contractor was can you roof over wet plywood able to complete maybe 1/5 of the metal panels daily as a layer. Require this material as a layer of moisture within the roof using a hammer and 1/2-inch roofing nails seams the! An issue wipe the plywood getting wet before you felt it class 2 ( EN 636-3 ) can! Wet as well the sun can help thoroughly dry the OSB your attic to see it... Uniform deck structure for the metal panels around all protrusions using a box. How to replace rotten plywood on top of the wood the building codes also commonly require this material as protective. Look up in your attic to see if the shingles won ’ t be used inter-changeably for roof has! The structure and outer layer evaporate when the sun can help thoroughly dry the.. To hold button inside to close? to dry much quicker than OSB picked up on this about! Wet it absorbs the rain like can you roof over wet plywood sponge quality of plywood can also affect the properties! Has shown experience to dry much quicker than OSB installed panels on 01752 692 760 this roof 6! If it dries out during dry periods and get wet again onunderside of the roof the.! Moisture within can you roof over wet plywood roof on as soon as possible and then shingles laid... To 16-inch intervals 1/5 of the previously installed panels attic insulation and venting in home. Tar, shingles, asphalt rolled roofing or felt paper - see if it dries out during dry periods get...