Discuss plywood on garage roof in the Electrical Forum area at ElectriciansForums.net. 3768 Eureka Way Metsä Wood Spruce plywood is the perfect roofing plywood. Avoid bad workmanship at all costs! I. ianphilip007-Apr 25, 2012 #1 Welcome to ElectriciansForums.net - The American Electrical Advice Forum Head straight to the main forums to chat by click here: American Electrical Advice Forum. Steps should be taken to protect existing materials and completed work. First of all, let’s discuss what is plywood. The airflow was obstructed from the soffit vents to the ridge vent by too much insulation and no baffling. The most common materials for this are oriented strand board (OSB) or plywood. Plywood has a slight advantage with stiffness. OSB takes longer to get wet than plywood but also takes longer to dry out. If you’ve ever built or had a house built in a wet area of the country you know that traditional plywood or OSB can swell when it gets wet. Is there a way to clean the plywood and re-baffle? The roof decking should never sustain water damage for the following reasons: If a roofer has already started working on a new residential roof install and it happens to rain, they should act immediately. This can be simple discoloration but should not affect the quality of your plywood in general. HomeFix column by Dwight Barnett advises a reader that his roof problem is likely the result of installing shingles over wet plywood. Frederick, CO 80516 B & M Roofing of Colorado, Inc. 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. The type of plywood you have can also affect the rate at which the water will absorb. Oy. The other day I was bringing some home from the store when I got caught in a storm. Decking should be in place before other roof materials can be applied. FAX: 303.938.9642, © Copyright 2021 B and M Roofing | All Rights Reserved | Website Design By OTM, The Roofing Industry Alliance for Progress, meeting with a roofing contractor prior to hiring, warranty will usually vary by roofing type, 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, Keeping water trapped in roof decking can cause the roof to eventually swell or buckle, Trapped moisture can cause mold and mildew growth, Dry properly, especially if it’s swelling. We have lots more on the site to show you. Source. Even with advancements in weather tracking and our daily consumption of weather forecasts, there’s no guarantee a rainstorm won’t strike. As a professional roofer, roofing in the rain is not an ideal setting. What makes this product really amazing is its resistance to water. Together with a trade qualification in Cabinetmaking, I feel I can make your time in the workshop more enjoyable! While the glue is mostly waterproof, excess rain can cause the glue to fail. Rain can be extremely unforgiving, but the good news is, it won’t last forever. If you must return wood surfaces to immaculate, pristine … In most cases, this de-laminating will only inform the edge about 50mm (2″) and you should be able to cut this off before using the sheet. Delaying a repair or replacement for a few days is well worth the wait. More often than not, this plywood will get rained on before the roof is on which begs the question, can plywood get wet during construction? However, leaving your plywood out in a rain event overnight is not a good idea. In these instances, be sure you’re working with a roof that considers all possibilities and has a dedicated backup plan in the event of inclement weather. A home or commercial building can sustain water damage during roof replacement if rainy conditions are too frequent. It seems to be on the northern exposure only. It is an ideal sheathing panel in both visible and non-visible roof constructions. The shingle installation looks good. Think twice before you hire roofers that appear to be in a rush. Check out this post which is one of the most popular of all time. This is a new one on me. 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. OSB vs Plywood Screw Holding Yes, there are several different material options and types of roof plywood. Chances are, the shingles on your roof were attached on top of a plywood base. Excessive indoor humidity can cause blistering and peeling paint, warping and rotting wood, as well as the formation of mildew & mold. Consider meeting with a roofing contractor prior to hiring as they should be able to explain various building codes in your area and disclose tactics to avoid roofing in the rain. Go. The next thing to look for is warping or cupping. First, they should make every attempt to cover the roof decking and other exposed materials. The client claimed the underside of the roof deck was wet. But like all wood, each layer of the plywood can absorb moisture, whether from direct contact or through … Once the outdoor temperature rises, that frost melts and can mimic a leak. OSB takes much longer to dry out and tends to retain moisture, which can cause it to degrade a lot faster than plywood. The plywood is nailed to the roof rafters, and unless the builder used a tongue-and-groove plywood or "H" clips, the long edge can warp in between each rafter. While the glue is waterproof, the wood fibers are not. Sometimes referred to as roof sheathing or a roof deck, this plywood acts as a foundation for the layers of underlay and the shingles on your roof and connects the roof to the frame of the house. Different Material Options & Types of Roof Plywood. If your plywood has taken on a lot of water then you will most likely have severe warping or cupping in the sheets. 2x6 rafters no overhang therefore no soffit or venting. Plywood is made from layers of thin softwood sheets glued together with alternating grain directions. Can You Roof Over Wet Plywood? OSB and CDX do not only look different, but they have unique … This raises a question, can plywood get wet? Professionals set roofs’ rafters 2 feet apart, whereas the plywood decking is placed with a minimum thickness of 7/16 inch. Is one better for roofing than the other? Sanding wood building surfaces such as plywood or tongue and groove roof sheathing, wall sheathing, or wood framing is usually unnecessary and inappropriate. Of course it's been raining this weekend and my newly sheeted roof is getting wet. Other issues that can occur such as rain create slippery conditions that make roof-work hazardous. A tightly pressed A grade plywood will be better than a cheap sheet of OSB. The ideal thickness for the standard rafter spacing of 24 inches is 5/8 th of an inch. Shingles and roofing materials may not adhere properly to slick surfaces with high humidity. Once plywood has become wet, you must encourage the water that has soaked into the wood fibers to evaporate to make it dry again. When planning to redo your roof or repair some damages, you might come across different grades and types of wood, such as OSB and CDX and start wondering what those abbreviations mean. The felt, if it is wet when the shingles are applied, will invariably bulge and crease if not outright tear under the workers feet (or bulge/crease just by being wet in many cases) which can also reflect through to the shingle surface as bulges and waves. In all interior cases you will not need waterproof plywood, although sometimes you may have an outdoor project that requires waterproof plywood. In general, the ideal weather conditions for roofing are clear, warm days. Some Marine plywoods are guaranteed for 15-25 years but will depend on your use and location. During extreme cold temperatures, frost can build up on the underside of the roof sheeting (attic roof). When the roofing material dries quicker, it can be used to make sure that the roof will stay firm for a longer time. Valuable books on beginner woodworking exist for every skill level. We're building a sunroom addition, nuts to do this in winter, especially this winter in the Atlanta area, but so it is. Stiffness . In some cases, you may not be able to sand it out. Actual plywood is a better product IMO than OSB which is the least expensive sheathing and why used. It does exist and it is called Marine Grade Plywood or often called Marine Ply. Many of the inner components of your roof—such as barriers, OSB boards, and felt— … OFFICE: 303.443.5843 I am using a 7/16" OSB Sheathing that I got from Lowe's. This will ensure that the strength of the plywood is enough to bridge spots on the roof where the old plywood was weakened to the point that it would sag under the load on the roof. It normally gets plenty of sunny days to dry out so this plywood getting wet is not too much of an issue. Timber Grain also participates in affiliate programs with Bluehost, Clickbank, CJ, ShareASale, and other sites. Framing or structural plywood that has an A grade glue bond will stand up to quite a lot of moisture before it is affected. Plywood is mostly available in 6, 9, 12, 17, 19, 25, 33mm thicknesses. If a roofing installer decides to work under less-than-ideal weather conditions, such as rain, it could lead to your manufacturer voiding their warranty. Plywood is often used in roofing because it performs well when exposed to moisture over long periods of time. That said, there are many instances where the rain is unavoidable and unpredictable. The top 3 sheets of plywood got wet and were actually soaked in water. I have been doing woodworking for over 30 years. These excellent how-to books for woodworking can... MDF seems to be the one thing that scares most people whenever they need to screw into its edge. Note: Colorado is notorious for hail and rainstorms. Before we start talking about the different options, it’s important to note that plywood has different grades: A-grade; This is the highest … Reputable roofers across Colorado usually provide their due diligence when it comes to assessing and scheduling a new roofing job. I thought I would share my experience and how I managed to save those sheets. It's 5/8" CDX. Commonly made of spruce, pine, cedar, redwood, fir, or Douglas fir, softwood plywood is used for industrial and construction purposes for roof sheathing, sub-flooring, and exterior frames. Whereas, when plywood gets wet it swells consistently across the panel, then shrinks as it dries. However, a manufacturer does not guarantee the product warranty unless the roofing contractor adheres to set guidelines. The roof has just a few pan vents and no soffit vents. I decided to start this site to educate others on the things I have learnt. Some bays have small amount of mold some dont. While roofing services should avoid severe rainstorms, experienced roofers should have temporary fixes when a rainy day is unavoidable. Because the weather in the Centennial State can be volatile, preparation is key. With any excess water on wooden products, you will notice dark stains throughout the sheets. Here are the steps I take to get a good seal and a nice finish on plywood: In nearly all houses that get built, plywood is one product that is used extensively as either wall bracing or flooring in double-story dwellings. A: It is never a good idea to install a roof over wet plywood or any type of roof sheathing. Post pics... you may have no problem and it may be … A wet roof should: When roof decking is wet, it can swell. I hope this article was of benefit to you and helped you understand more about plywood getting wet. Plywood is an excellent material that is used in different types of construction. Overall, plywood is a little bit better for roofing. When the workers returned to the attic, they most likely added a 2- by 4-inch block between two or more of the rafters and then tried to secure the warped edge of the plywood using wood screws. And in case you’re wondering, yes, the I-joists holding up the subfloor also got wet (primarily the plywood caps, not so much the OSB ribs). The plywood is NOT rotted. Simply look along the surface to see if this is an issue for you. Considering the various issues that can occur, it’s worth it to take time to evaluate weather conditions and assess the time of year to consider a roof replacement. The last thing to tell if your plywood is ruined is the edges will usually start swelling or de-laminating. The important thing is too keep it covered up and remove any excess water straight away. AdvanTech – Worth The Cost . Warping wood is now creating a … painting the plywood I highly recommend this article for the best results.
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