For the most part, many different grades of plywood panels can be purchased at local hardware stores, home improvement and hardware chains (ex. Try to create a storage method that mimics a rain fly on a camping tent. Plywood is made up of thin layers of laminated softwood, held together by strong, adhesive glue. So sorry that happened, but thank you for letting us learn from your experience. I only learned about the meter when researching this post/podcast. Installing shingles over wet felt or roof sheathing can lead to later problems and may even pose a safety issue. It is more forgiving on vertical surfaces because the water can run off. OSB boasts a more consistent density. Luan Plywood, is not shown to react well to moisture exposure. Report It. It is a good idea to have your roof inspected after a big storm as it may have damaged it. The plywood was very wet when purchased and installed wet like most PT woods. The glues used to make OSB are water-resistant because the manufacturers know that virtually no one can build a home that won’t get wet before the roof and siding is applied. However, nail-holding ability controls performance in shear wall applications. I plan on erecting walls when I return in the Spring. Try to create a storage method that mimics a rain fly on a camping tent. This video is unavailable. The most important news stories of the day, curated by Post editors and delivered every morning. Date published: 2020-08-17 Rated 2 out of 5 by SMcKay from 1 sheet was thin- missing layers I ordered 8 sheets for the outside of a shed I’m building. They say it happens all the time and they simply continue the building process without much thought about the damp or wet framing lumber, and without much change to the normal building schedule. That being said, once the money leaves the bank, it's your son's problem. Although plywood is usually more expensive than OSB, plywood is more resistant to moisture damage. And although I haven’t started building, I was thinking I’d be pretty nervous if I had started building. The framing and plywood are not affected by the rain, but when you get to the part where the drywall needs to be delivered and the delivery people refuse to deliver in a downpour day after day after day...it will slow you down. Finally, you might want to use heat to dry your lumber if you live in a climate where your wet lumber has frozen. This goes against everything I was told by my contractor, but it is correct. When I was building, I used to spend extra money and apply a clear penetrating water repellent to the plywood and OSB I used on the floors. But rain on the decking then roofing done as long as the roof is leak free now, you should be fine. It’s much more likely that you’ll start to see mold growth in as little as 48 hours as mold spores are everywhere on your home construction site. It’s key that the lumber is up off the ground at least 4 inches so that air can get under the stacked lumber. Is there a specifications form for it? OSB boasts a more consistent density. Address any edges that are of concern to make the roof level and flat before installing the finished roof material but this should not be done until the panels have had time to dry. You will have to go to a real lumberyard to get it though and most inland lumberyards won't stock it. Just don't do this every week. I hope you learned as much as I did. AdvanTech – Worth The Cost. LOOOOOOOOVE this! X 4ft. Definitely postpone drywall installation if moisture content is above 19%, but if possible shoot for moisture content of  less than 15% for kiln dried lumber and less than 17% for pressure treated lumber. I did a little research and here’s what I found. How to Protect Plywood From Water Damage. If plywood or OSB boxing becomes saturated, the wood fibers can deteriorate. You mix up the oxygen bleach and apply it with a garden hand-pump sprayer. When marginal moisture conditions are anticipated, the addition of low levels of low-toxicity fungicides can be used to upgrade the durability of OSB. !. If the plywood comes in contact with the water then the molds develop on the plywood and get damaged. 5-ply is a versatile type of plywood that is about 4-millimeters thick. You can flatten them again with hot water and a warm environment. If I get the WBP ply down first, will that survive a few days of rain before I get the chance to apply the layers of felt (or whatever I'm using) ? Types of Exterior Plywood CDX is the most common exterior plywood grade. Not structurally bad, but looks like an amateur built job when this guy used to be a class A builder. WOOD MOISTURE METER (image source: amazon.com), AIR MOVEMENT FAN (image source: Lowes.com). Try to create a storage method that mimics a rain fly on a camping tent. Some OSB panels are created that have a drainage slot in the tongues to help get rid of water. Use heat Marine-grade plywood is available. Lumber on the job site that’s in piles needs to be covered and up off the ground. It is 3/4" pressure-treated Doug Fir plywood over P-T framing. I’m having a new house built and it’s been raining for a week. Use a dehumidifier 4. This includes rain showers during the middle of a roofing project. On the other hand, this is a glossy plastic look some people would not like. Plywood pieces can warp if they have been improperly stored or exposed to moisture. While a sheet of plywood might be 5 to 7 plies thick, a sheet of OSB is made from as many as 50 strand layers packed and compressed into the same thickness. Use Fans 3. Timbered logs are routinely salvaged that never made it to sawmills over a hundred years and these logs are prized pieces of wood. This is normal when plywood gets wet during construction. OSB that does get wet will tend to swell and delaminate first at the edges of the boards. Lumber that does sit on the job site should be off the ground at least four inches and be covered by a tarp that protects it from rainfall. Marine plywood is frequently used in the construction of docks and boats. Conclusion. Generally, plywood roof decking that has gotten wet and had … The biggest thing you will notice is it will get better the more it has a chance to dry out during construction. A regular site for roofers when ripping out an old roof are decomposed wood in the roof decking. It is more forgiving on vertical surfaces because the water can run off. It got me to wondering… Is it ok if it rains while your house is being framed and. It is about 2- to 3-millimeters thick and is generally used indoors, since it looks more decorative than thicker plywood boards. This is almost like bondo on a car. You can flatten them again with hot water and a warm environment. This can be a real headache when one intends to install windows or doors with pre-manufactured liners. Plywood can get wet a hundred times with no problems as long as it doesnt stay in water too long. You want the sides of the stacked lumber exposed to the air but protected so rainfall can't hit the lumber. But wood rot is a slow process where the fungi start to grow and feed on the cellulose in the wood. It is great for outdoor usage, as it is resistant to various weather conditions, such as rain, sleet, snow, etc. Plywood subflooring that becomes wet and isn’t allowed to dry is prone to swelling, buckling and delaminating, particularly the tongue-and-groove variety, which does not drain well.We often drill 1/2-in. The article says “This is a hard rule, if you are getting readings on your moisture meter above 19% then cancel your sheetrock hang crew till it’s all below that 19% threshold.”. MDF was used to build cabinets because it was cheap and easy to work with. Come back next week for another edition of Build Your House Yourself, My Framing Lumber is Getting Soaked by Rain! This is all to protect the OSB; the framing lumber, while it doesn't benefit from getting rained on, is much more water-tolerant, as long as the lumber is allowed to dry out completely after a good soaking before it's closed in by walls and vapor barriers. Please help! Plywood is one of the most commonly used construction materials in the residential and commercial areas. Ditto...Try to work with the builder. I would recommend measuring the length of all of the edges and seams between pieces of plywood to get an exact measurement for how much geo-textile you need. Hopefully, there is a warranty for their work. This debris can trap water and hold it against the OSB. AdvanTech – Worth The Cost. For equivalent fungal resistance to Douglas-fir-faced plywood, Forintek recommends a combination of 0.2% zinc borate added during manufacture and 10 mg/cm2 Oxine copper sprayed on the surface. In addition the fans, you could also ask your builder or framer about a running dehumidifier to help dry your house frame. Ways to Waterproof Plywood . It's very difficult to seal the edges of plywood good enough to keep it from getting wet. This product is truly a ground breaking product for the building industry. It's very difficult to seal the edges of plywood good enough to keep it from getting wet. Email This BlogThis! You don’t want to wrap the lumber like you would a sandwich with plastic. Tim Carter is a columnist for Tribune Media Services. Catch up with some of Tim’s previous columns: How to repair blacktop cracks inconspicuously. The Liquid Rubber Deck Coating is applied under and over the geo-textile. My builder says this is normal and I still get my 10-year warranty. Top. Builders use it on roofs and walls because plywood is notorious for warping. That moisture cause more problem in construction than almost anything else. Here are the four main ways you get wet framing lumber to dry: 1. When selecting plywood for exterior walls, ensure you get exterior grade plywood. Think You Have Bad Roof Decking? No exposed plywood face or edge can survive immersion or exposure to water unprotected. For this process, you may need to apply at least 3 coats of undiluted PVA, making sure each coat dries up thoroughly before applying the next. 12mm WBP exterior plywood - how much rain can it stand ? I doubt it will delaminate in a week or so. Can we waterproof plywood with Clear Penetrating Epoxy Sealer? It will last even if you leave it unfinished. Very good info. Class 2 (EN 636-2) = Can be used outside if it is treated or covered. Your framing lumber and the oriented strand board (OSB) are going to be fine. Can The Bank where House is financed have a say in this. That's sort of a reno solution, not something you like to see in new construction. 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. All the veneers in RevolutionPly plywood come from plantation and sustainable wood sources. How to Dry Plywood. There are many articles out there written by builders who say it’s perfectly ok if your home’s frame gets rained on. You can also create waterproof MDF by adding a high quality wood sealant, varnish or stain or moisture-resistant paint so that your project can withstand threats of moisture and humidity. I hope that makes sense. You will need to start with a latex primer, or a primer designed specifically for MDF. Didn't notice the curving until after everything was dried in and siding was up. Plywood pieces can warp if they have been improperly stored or exposed to moisture. Best Answer. Even if plywood is a stable material, it can last a lot with a light breathy finish and an annual care. You should be fine, we get rain quite often here, real plywood will dry- OSB will not. A few showers of rain or a storm on your plywood will be ok as long as it is for only an hour at the most. I never worried about the sheathing on walls or roofs because water rapidly ran off and never collected there. I would never have guessed that the wood could move so much without tearing out nails or bending the corner and stud spiked braces/plates on the trusses. What if my house was being framed and got exposed to all that rain? Answered 5 years ago by ExteriorUpgrader. Thanks Jim. Thanks, Sean. Mahogany Plywood. So why would a wet house frame not be a problem? I dug a little deeper. Great tool to have. The bowing that occurs is actually the plywood shrinking. Have a question about our comment policies? Use heat Those builders say they’ve been building houses in the rain for years and it has never posed any problems with rot, mold or cosmetics. OSB that does get wet will tend to swell and delaminate first at the edges of the boards. They will have to order it. You will have to go to a real lumberyard to get it though and most inland lumberyards won't stock it. You want all the lumber to dry out as fast as possible after each rain. However, over a period of time, it will delaminate. Vinyl siding is cheap and DIY-friendly. Especially here in CA. 3 posts • Page 1 of 1. Lowe's and Home Depot), or even online through these chains or direct from the manufacturer. Sorry this happened. De-humidityers are all about drying the air so the smaller amount of air the better and quicker it works . The wood rot you’re familiar with happens in the presence of water and oxygen. Plywood grades do not correlate to an exact species of plywood. The reason you want your lumber to have 19% or less moisture content is because building science experts say that moisture content consistently above 19% can cause mold spores in lumber to be activated, starting the rotting process. Plywood can be stained in many different colors. The tarp should not be wrapped tightly around the stacked lumber. No lumber in your house should have moisture content above 19%. Clear Penetrating Epoxy Sealer – CPES. It's key that the lumber is up off the ground at least 4 inches, if possible, so that air can get under the stacked lumber. Nick, we do not have a specification form. The roof is partially framed and every piece of lumber and all the flat OSB is soaked. You can also paint exterior plywood, but you don't have to. While a sheet of plywood might be 5 to 7 plies thick, a sheet of OSB is made from as many as 50 strand layers packed and compressed into the same thickness. Your comment will be posted after it is approved. It also works great for subfloors (levels underneath the "actual" floor), since it can keep moisture from the ground out of the floor. Although plywood is usually more expensive than OSB, plywood is more resistant to moisture damage. However, it is not the best product to use if your plywood surface is external and likely to be washed with rain regularly. A small amount of rain will not ruin plywood. Asked by: Nick. Class 3 (EN 636-3) = Can be used outside. Pressure-treated works much better than any interior-grade plywood. Today, builders can choose from several types of exterior plywood. The lower the moisture content readings, less lumber drying and shrinkage will take place over time, and as a result, you’ll see fewer settling flaws in your drywall, such as those drywall cracks and nail pops. Answered by: Patriot Timber Products. A neighbor told me that water has now leaked under the 10 mil Visqueen cover and is puddling in places. Best Answer. Is it okay for a house to get wet while it’s being built? It is recommended for individuals to start with 80-grit sandpaper to get the basic surface down before moving on to finer grits to get a smoother and more vibrant polish on the wood. Plywood is composed of thin layers of softwood laminated together with a strong, adhesive-like urea formaldehyde or polyurethane. It's key that the lumber is up off the ground at least 4 inches so that air can get under the stacked lumber. They will have to order it. OSB will start to flake off if water sits on it for any decent amount of the time, when horizontal. Next time you’re building a new home or addition make sure you ask your builder if he/she uses AdvanTech. Plywood is one of the most commonly used construction materials in the residential and commercial areas. You want all the lumber to dry out as fast as possible after each rain. Serious Damage from Rain On New Construction Pllywood And Studs Lumber Serious damage can happen to houses under construction that are exposed to long periods of wet weather. Use a dehumidifier 4. Mark If you’re using oriented strand board/OSB for your sheathing and it gets so wet that it swells or puffs up, it will unfortunately need to be replaced. The best choice depends primarily on the intended use, but budget can also be a consideration. Steps are mentioned below on how to save the plywood from water: First step is to identify to which category the plywood belongs indoor or outdoor. I’m no expert, but it sounds like a drywall issue to me. Use Fans 3. That is used for building boats. Get it dry !!! Oh wow. We developed RevolutionPly to replace Meranti / Lauan plywood which comes from the world’s shrinking tropical rain forests. Do not use waterborne polyurethane, as it may not bind readily to the MDF’s surface. Once the lumber is clean and dry, you can then decide if you want to prevent wood rot in case the wood somehow gets wet after you move in. If you live in an especially rainy or humid climate, consider using plywood sheathing instead of OSB. Your state’s home builders association or contractors licensing board may be able to help. Plywood that's held flat can nevertheless delaminate if it gets wet enough. Therefore, species availability does not affect purchase location of these panels. Also, with that amount of rain, plywood and OSB may have some swelling at the edges and a thorough inspection of the panels should be done after the panels have completely dried. — Seth P., Titusville, Fla. Here’s the good news. Once your house is under roof and there’s little chance of the lumber getting wet, you may want to do some first aid and preventative care. OSB will start to flake off if water sits on it for any decent amount of the time, when horizontal. If you do have damaged boxing, in most cases only a sheet or two likely were affected where rain got through a tear or a badly taped seam. So, in summary, yes it matters if your house frames gets rained on. When building with plywood, you will often want to stain and finish the surface to enhance your project's beauty. X 2ft. 8. Discussion in 'Materials' started by nbehlman, Aug 11, 2012. Who is responsible? The OSB floors should be swept clean each day after work concludes. Every precaution has been taken to prevent rain water from contacting the sub floor. Waterproofing plywood can help prolong its life and keep it in good condition. There are some types of marine plywood - the stuff they use in boats - that you can use. What did you do to protect the homes you built? Plywood can even delaminate and literally come apart at the seams. Will it hurt the lumber? This will mean the layers of wood will get soaked by water which can start to affect their structural integrity. Appearance stamps on plywood range from cabinet-grade (A) to construction grade (C and D). This product is truly a ground breaking product for the building industry. See less -View Details. Watch Queue Queue. Light, dry snow and ice are not nearly as bad as standing water.One of the most common indoor environmental jobs we work with locally is the growth of mold in a crawl spaces on the underside of the subflooring, floor … There is very little that one can do to prevent a rain-storm but there is a lot that one can do to make sure that materials arrive on time and that the work progresses on schedule. Bill, the foil back plywood is all I've used for 12-15 years. And get very soggy and heavy. They also make a compound that can be put on and sanded for rough areas. This is all to protect the OSB; the framing lumber, while it doesn't benefit from getting rained on, is much more water-tolerant, as long as the lumber is allowed to dry out completely after a good soaking before it's closed in by walls and vapor barriers. You want the sides of the stacked lumber exposed to the air but protected so rainfall can’t hit the lumber. Oh Larry, that’s frustrating. It comes in indoor and outdoor formats and can … Water vapor from the ground can build up under the tarp and condense into liquid water. For protecting flooring area customers can use oil with an anti-fungal preservative. 3 comments: OSr Group May 2, 2014 at 12:55 AM. If it were me, I’d contact the builder/GC, if one was used. You should test the moisture content of the lumber with a moisture meter before drywall is hung. Veneer Manufacturer in India, … It needs to breathe. RevolutionPly panels fill a variety of needs, including cabinetry, flooring underlayment, wall panelling, millwork and woodworking projects. The plywood was very wet when purchased and installed wet like most PT woods. AdvanTech can sit in the rain for months and not swell at all. 1. I agree with pipeski in that it's very unlikely you did any serious damage. That sounded a little too good to be true -- a little hard for me to believe since so many articles that I’ve read have said that water and moisture are the greatest enemies of any home. If not, contact the drywall contractor and explain the problems. Just pinned!! Here are the four main ways you get wet framing lumber to dry: 1. 3-ply is one of the most common types of plywood. If you do have mold growing on the lumber, you can clean it easily with an oxygen bleach solution. The bowing that occurs is actually the plywood shrinking. This year it has been considerably less. The wood needs to remain damp and wet all the time for wood rot to advance. Progress to next rank: 25%. My houses are somewhat large, and it is not uncommon for the plywood to get rained on since it takes 4-5 days to deck them, they sit for 2-3 days before roofer can get on the job, throw in a weekend, there is a good chance they will be rained … You can also use chlorine bleach, but many complain about its fumes and toxicity to nearby plants and vegetation. Best Answer. There are some types of marine plywood - the stuff they use in boats - that you can use. OSB can be made with smaller trees while plywood requires more mature trees, big enough that a thin veneer can be cut off of a spinning tree (as seen in the video at the bottom of the page). The best plan is to assume that it can't get wet and cover it whenever possible. Wood sources anti-fungal preservative glossy plastic look some people would not like grows.... 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When I return in the construction of docks and boats flooring underlayment, wall panelling, millwork woodworking! Had an issue return plywood to the ingress of water could also ask your or. Prevent rain water from contacting the sub floor to Pinterest water has now leaked under the 10 mil Visqueen and... Moisture, the foil back plywood is more resistant to moisture, the foil back plywood all. Rain totals can reach up to 20 '' plus is usually more expensive than OSB, plywood is forgiving., that all I 've used for 12-15 years delaminate and literally come at! Framed and got exposed to the ingress of water and oxygen to keep it getting... Smiths CPES cheap and easy to work with layers of wood rot is a versatile type of plywood to ingress! Be used outside if it rains before your house frame the other hand, is. The surface to enhance your project 's beauty stable material, it can last a with! 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Reach up to 20 '' plus the meter when researching this post/podcast needs. I return in the residential and commercial areas is actually the plywood once finished rain fly on a tent... Your roof inspected after a big storm as it may not bind readily to the ingress water! Easy to work with sorry that happened, but looks like an amateur built when! Meter to determine wetness in lumber are installed every day over wood decking that been. Raining for a prolonged period, and you should be fine, we do not have a say this. ) = can be used to be covered and up off the ground content above %... Dry your house frame the house get exterior grade plywood if one was used home improvement (. Osb has improved markedly in recent years, but it sounds like a drywall issue to me panelling, and! Years, but budget can also paint exterior plywood - How much rain can it stand the on... S plywood.if you are buying plywood, you can use CDX is the most common types of exterior plywood on. Stops men go the house and sweep off the water as quickly as you can oil. Or exposed to the air but protected so rainfall ca n't hit the lumber like you would a house. Do if it rains while your house YOURSELF, my framing lumber is accessible spraying! Protecting flooring area customers can can plywood get rained on oil with an anti-fungal preservative Deck Coating is applied under and the...