Installing shingles over wet decking also will void any warranty you might have from the shingle manufacturer. Class 3 (EN 636-3) = Can be used outside. Remove all unused vents, pipes and protrusions. She works daily as a professional painter/home remodeler/handywoman while lending her husband's roofing business a helping hand in her spare time. What is the venting of the attic/roof currently? 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. The quality of plywood you use can make or break the success, look and longevity of any project. Favorite Answer. The most common materials for this are oriented strand board (OSB) or plywood. If you cannot find a piece big enough, you will have to join several pieces as you apply them. To me it sounded like you think that once this osb gets wet it absorbs the rain like a sponge. I'm doing a lot of the work myself, help from a metal roofer with other skills. This component is essential in both metal roofing and traditional asphalt shingle roofing. Category 1 plywood and OSB could grow mold from standing water. A: It is never a good idea to install a roof over wet plywood or any type of roof sheathing. However, there's just too much white, making it detract from the entry. Glenn says. In 2005, she began a career in roofing, interior design and remodeling. 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. Speak to an expert today on 01752 692 760. Can EPDM be bonded directly over asphalt, tar, shingles, asphalt rolled roofing or felt paper? We roof in the middle of Winter in MN doing new construction. 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 National Roofing Contractors Association (NRCA) includes roofing felt in its recommendations for roofing and waterproofing. Then go on with your tar paper and shingles. Hammer down all raised nails. Overlap the edge of the first panel by 12 inches. It helps protect against water entering the building. Alison. 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. 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. FRT plywood that is suitable for long-term use as a fire-rated roof sheathing is. More than likely even if put over a damp deck it will dry out and adhear just fine. Install gutters in valleys as needed. Continue until you reach the peak of the roof. A: It is never a good idea to install a roof over wet plywood or any type of roof sheathing. 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. In This video I show how to replace rotten plywood on your roof without breaking your back! If the shingles are also put down, then your roof will appear to have bubbles in it. That said, pros say a new roof should never be installed over wet wood or a wrinkled barrier. 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 … Relevance. Also, the edges of the panels are treated with a sealant to resist moisture penetration. Return to the low end of the roof and begin installing the next row of metal panels. In the process of constructing a roof, there are typically two different roof decking materials. Conclusion. Roof replacement is expensive. No ceiling leaks.. 2 layers of shingles. Cut the material to fit around the base of all protrusions using a roofing knife. garage door acting funny,wont close with opener and have to hold button inside to close?? 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). Gable vent used to be the norm but the ridge vent does a better job. 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. First by absorbing the water, then releasing it. Install the first metal panel on the low end of the roof, square to the eave. Best would be if you can tarp the shed until the threat of rain has passed. Not wet but some areas slightly damp. This is also on a wall behind our water expansion tank. Lay the first rib on the left side of the panels over the last rib on the right side of the previously installed panels. 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 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. Class 3 (EN 636-3) = Can be used outside. 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 OSB gets wet, it will swell over time. This is a new one on me. This kind of plywood can be used on roofs with minimal load; ... and it seems to delaminate when it gets wet! Inspect the plywood for damaged areas. I 30 years of doing this and getting the roof covered in felt the same day you got lucky. 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. Lv 7. No other roof has this in the area. by ContractorDon. Could the roof actually stay wet all that long since the venting is poor? 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. 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. Roof felt serves as a protective layer between the structure and outer layer. That said, pros say a new roof should never be installed over wet wood or a … Once the coating under the geo-textile mostly dries, you can apply a coat over the geo-textile. 9 years ago. I 30 years of doing this and getting the roof covered in felt the same day you got lucky. Lots more comments on attic insulation and venting in the Home > Roofing and Home > Insulation sections in Browse Project at lower left. Secure the gutters using a hammer and 1/2-inch roofing nails. An easier option is to saturate all the layers of the plywood, using warm wet towels, prior to bending. Ensure that the plywood deck is strong enough to withstand the added weight of the metal panels. About 1/4 of the roof sheathing has mold growth on it and has about 60% moisture content. The builder needs to get the roof on as soon as possible and then let the house air out. Ensure that the plywood deck is strong enough to withstand the added weight of the metal panels. The trapped moisture cannot evaporate when the sun heats the shingle. Then pull off the tarp so the sun can help thoroughly dry the OSB. Looks great! . Normal delays and the rain you indicated will not affect the structural properties of the panels. Repeat step 7 for each row until all panels have been installed. Roy Gingrich of Ellicott City has a 40-year-old house with an asphalt shingle roof … Plywood is often used in roofing because it performs well when exposed to moisture over long periods of time. Plywood and OSB should be put under roof as soon as possible when building. Install waterproof felt over the plywood to add protection against moisture. Certainly it would have been better to have covered the roof with a tarp or roofing felt before it rained. Use metal snips to cut flashing material. We staple most our ice and water shield even on 4/12's. The shingle installation looks good. 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