"Would it make sense to paint the edges of those that I've cut?". The OSB floors should be swept clean each day after work concludes. We are in the middle of framing. If you have seriously standing water on an OSB or plywood deck, try to find the deepest parts and drill a 3/4 inch hole there to let it drain. The glues used to make OSB are water-resistant because the … The usual fix is to attack your subfloor with a belt sander after the roof is on, and to replace the worst of … Plywood allows for a much better build-up with lower undulations in the subfloor. Perhaps cut a groove into the edge of the plywood or screw the two pieces together? When I was building, I used to spend extra money and apply a clear penetrating water repellant to the plywood and OSB I used on the floors. This debris can trap water and hold it against the OSB. All scraps of lumber, sawdust, etc., need to be off the OSB. You can also watch hundreds of videos, download Quick Start Guides and more, all for free.) You'll probably end up with OSB that has swollen edges, creating ridges like picture frames. and even below the underlayment, in some cases. Rain falls on many, many homes as they are being built. Fastener Holding Compared to PS-2 panels, AdvanTec… 2. Premium OSB decking like advantech is not harmed by water, it has a waxy treatment on it from the factory. DEAR TIM: I'm having a new house built and it's been raining for a week. If you want to use OSB to sheathe the walls of your shed, you need to build those walls like the walls of a house: with a weather-resistant barrier like Tyvek over the OSB, and then cover that with siding of some sort. 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. When was the floor last exposed to rain and/or standing water? Step 3 Apply water seal to the surface of the plywood. Houses I built got wet routinely during the framing process and I never had an issue. 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. I’m building by myself and very slowly, so it might take me three months before I have walls and a roof. Standing water on the OSB needs to be swept away. The house I’m building in central Arizona has a subfloor of 23/32″ Norbord Truflor OSB on i-joists over a ventilated crawlspace. Water on new wood at a construction site may seem like a problem, but there’s little to fret about as long as the site is kept clean and free of standing water. How can I protect the OSB sheathing from rotting in the rain? Jeff, I'll grant you it had a protective layer of bark that works very well to protect the wood in the center of the trunk. Use a cordless drill or you might shock your ass off. Otherwise, the problem will just happen all over again in a short time. What did you do to protect the homes you built? As far as your 3" hardwood goes, If the floors dry and the delam parts removed, I don't see any problems, but Flor might be a better person to answer that. Build up from the lowest elevation, using the products that allow for enough incremental elevation gain to get to within flatness tolerance. If possible, head to the job site and start drying the OSB subfloor as soon as the rain … Plywood, or even OSB, has its strength running with its length. I'm thinking that the surface of the OSB facing the crawlspace will fluctuate between being moister and drier than the interior of the OSB so that moisture will migrate in and out through the underside, with an overall moisture level inside the OSB roughly equal overall to the moisture level of the crawlspace air--until I seal the undersides of the floor joists. Additionally, care must be taken to prevent water from collecting under the tarp. Other OSB Negatives Contractors, builders, and home remodelers have mixed opinions about the use of OSB … Protecting subfloor from water during construction We're building a tiny house on a trailer, in Florida, during the rainy season. Jeff, However, this option is only feasible if wall framing has not been erected. Measure out the area of roof shingles, siding, or floor covering that you must cut away to finish the repairs. Below are just a few of the benefits of AdvanTech subfloor. Wood in Arizona (especially moist wood) is going to be a termite nightmare. Every wood subfloor over a crawl space should be tested for moisture. Your framing lumber and the oriented strand board (OSB) are going to be fine. On average OSB costs less than standard plywood by 10-15%. I know the OSB comes presealed, but I'd like to add another layer of protection. Does my dry climate compensate enough for my slowness in building that the OSB should endure the time it will take me to get it out of the weather? Rain rot cures: it is a fungal bacteria that thrives in the moist dark environment. However, this option is only feasible if wall framing has not been erected. It's unlikely you will need to replace any of the OSB subfloor for structural reasons. As the weather warmed up, the rain came in and delayed the build once again. If you are worried about your floor, lay some 1/2" plywood over the subfloor (after dried-in) and then finish floor over that. Again, this type of stain is not intended to completely color the plywood, but tint and protect the plywood from the sun. In fact, the coating on this tried and tested sub-floor helps reduce water absorption by up to 40%. Q. Borate chemicals are not toxic to humans or animals, but they are very toxic to many species of wood rot fungi and termites. You must be a magazine subscriber to access this feature. The roof is partially framed and every piece of lumber and all the flat OSB is soaked. The subfloor continues to dry and the flooring starts to buckle because the fullness created by the subfloor shrinkage now has nowhere to go. Newer building products are available for subfloors that contain resins that protect the wood fibers from absorbing any water. Step 1 - Make Sure Your OSB Is Waterproofed. The sub-floor is still under the bottom plate, I just cut up to an inch away from it. I tried tarps to keep the subfloor dry, but they failed miserably. AdvanTech® Subfloor – the Flat Out Best™ AdvanTech flooring has been providing a stronger water resistant subfloor that can repel the elements during construction, and out perform plywood and OSB in installation and performance for any floor finish. Under such a scenario, moisture from rain etc. (Need an answer? I've never used Truflor, so I don't know how resistant to moisture the product is. I assume any deterioration in the OSB will occur gradually. You mix up the oxygen bleach and apply it with a garden hand-pump sprayer. Never when exposed to moisture. There’s no better way to protect your sub-floor, reduce time-consuming sanding and minimize callbacks. This is one good reason why good construction includes good organization and scheduling. Proper Panel Spacing. Step 2 - Plan and Cut Your Pieces Every time you make a cut, any sealer at the edges will disappear and open up a new place where moisture and water can be absorbed. Sealed OSB. This debris can trap water and hold it against the OSB. All of Tim's past columns are archived for free at www.AsktheBuilder.com. Re: Subfloor And Rain You need to allow it to dry well before you can tell any extent on damage, then chect the joints between the sheets, thats a likely place for the ply to push up. You spray the lumber and OSB using a the same garden sprayer. OSB exposed during construction must be allowed to dry (especially before installing sensitive finish materials such as hardwood flooring). Your OSB panels absorb water from the edges, and the paint won't slow that down. This means the job site needs to be clean. Some OSB panels are created that have drainage slot in the tongues to help get rid of water. With a slab, they would be able to come up through a crack underneath a wall and eat away at the wall unseen. does not have the time to penetrate into the layers of wood strands or weaken the glue. The OSB floors should be swept clean each day after work concludes. Are you saying that some panels may absorb so much water from the edges that they will need to be replaced? DryPly® plywood Sturd-I-Floor® panels feature a water-repellent coating that provides excellent weather protection during construction. What can be done to prevent mold and rot that probably will happen? The usual fix is to attack your subfloor with a belt sander after the roof is on, and to replace the worst of the OSB panels with new ones. Plywood is available in many thicknesses (1/8”, 1/4”, 11/32”, 15/32”, 19/32”, 23/32” and 1 1/8”). This type of board is an excellent material for use in waterproofing systems, be they roof, sub-floor or wall. But wood rot is a slow process where the fungi start to grow and feed on the cellulose in the wood. You’ll want the screw to go about an inch past the plywood into the joist or underlying layer beneath it. Protecting subfloor from water during construction We're building a tiny house on a trailer, in Florida, during the rainy season. Before any walls were built on a subfloor, I'd blow off all saw dust, pour out the clear water repellant and apply it with a large paint roller on a pole. Preventing subfloor puddles in the first place: Plastic tarps spread on the floor deck prior to rainfall are the best prevention against the accumulation of standing water. As the weather warmed up, the rain came in and delayed the build once again. Never, never, never. In the meantime, I’ve considered protecting the OSB from weather by painting it with Rust-Oleum Porch and Floor, which is designed to withstand sun and occasional puddles of water. Will it hurt the lumber? To avoid buckling, subfloor panels should be spaced with a 1/8-inch gap at all edges and ends to provide room for naturally occurring expansion. Huber AdvanTech comes in subfloor and Sheathing panels. Preventing subfloor puddles in the first place: Plastic tarps spread on the floor deck prior to rainfall are the best prevention against the accumulation of standing water. Most subfloor-grade plywood uses similar glues between the laminators. Painting the subfloor won't cause any problems, but it's a waste of paint. As stated above, you will want to check that your OSB is stamped with "waterproofed" when you buy it. Even the new premium OSBs will swell somewhat at the … Mock’s crew had to shovel snow off the deck then squeegee water off it over the course of the build. This debris can trap water and hold it against the OSB. There’s no better way to protect your sub-floor, reduce time-consuming sanding and minimize callbacks. Under such a scenario, moisture from rain etc. I have no time frame as to when I get a roof over the floor and with winter approaching, I'd like to get something to protect my OSB from the elements. To address these water issues, OSB and plywood manufacturers are refining their products. Tolko T-STRAND™ OSB panels are improved, warrantied, and ready to perform. Acting quickly, therefore, means that your job of drying out the subfloor will be that much easier. Even the new premium OSBs will swell somewhat at the … Re termites, I chose a masonry stem wall over a slab so that I could see whether or not termites were invading. Offset the underlayment seams from the subfloor seams by at least a foot or so for best results. Step 2 - Plan and Cut Your Pieces Protecting your roof during construction with enhanced OSB panels can save you valuable time and money when you need it most. The water repellant prevented swelling of plywood and untreated OSB. Your OSB panels absorb water from the edges, and the paint won't slow that down. Using green joists. Flooring over crawl spaces is a nightmare to begin with. Below are just a few of the benefits of AdvanTech subfloor. Under the best circumstances, the OSB sheathing is delivered to the site, installed and covered within a few days. Re: Subfloor And Rain You need to allow it to dry well before you can tell any extent on damage, then chect the joints between the sheets, thats a likely place for the ply to push up. Try to create a storage method that mimics a rain fly on a camping tent. I know drying is an important topic at GBA, so I hope this will be an interesting question even if I won't actually paint the top surface of the OSB. 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. You want all the lumber to dry out as fast as possible after each rain. It's great to know that the paint wouldn't cause any problems. Your new layer of underlayment needs to be perpendicular to the joists just like the subfloor is. This feature has been temporarily disabled during the beta site preview. Available in: Enhanced, Tolko T-STRAND™ Pro OSB T&G subfloor; Standard, Tolko T-STRAND™ OSB T&G subfloor . OSB subfloor is mostly serving as a base under the finish floor (hardwood, engineered wood, vinyl tile, etc.) AdvanTech® Subfloor – the Flat Out Best™ AdvanTech flooring has been providing a stronger water resistant subfloor that can repel the elements during construction, and out perform plywood and OSB in installation and performance for any floor finish. does not have the time to penetrate into the layers of wood strands or weaken the glue. The important factor is making sure the inside of your walls are dry before insulating and sheetrock (. Sweep Standing H²O. Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. But realize that it takes quite a bit of time for lumber to start to decay from water. You want all the lumber to dry out as fast as possible after each rain… Jeff, Allow the plywood to dry for 24 hours. It has no odor and will do an excellent job of cleaning mold. You want all the lumber to dry out as fast as possible after each rain… Wood rot can and will start when the moisture content of the wood reaches 20 percent. Improper spacing. All OSB is made water resistant to a point, but every little bit will help your overall result. Under the best circumstances, the OSB sheathing is delivered to the site, installed and covered within a few days. To address these water issues, OSB and plywood manufacturers are refining their products. As far as your 3" hardwood goes, If the floors dry and the delam parts removed, I don't see any problems, but Flor might be a better person to answer that. Standing water on the OSB needs to be swept away. The edges on the Truflor come painted, I assume to resist water. Lesson learned. You'll probably end up with OSB that has swollen edges, creating ridges like picture frames. If possible, head to the job site and start drying the OSB subfloor as soon as the rain … Plywood and OSB manufacturers try to improve this by sealing the panel edges, but the sealant, whether it is a wax or a paint, tends to get scuffed off. For example, if … Lumber on the job site that's in piles needs to be covered and up off the ground. My builder says this is normal and I still get my 10-year warranty. Wear eye protection and a dust mask when sanding OSB to avoid injury from any splinters or sanding dust. I am in southern california and we're supposed to have a wet winter. Step 3 Apply an outdoor, latex-based paint to plywood in order to provide more protection that will have a more aesthetic appearance than traditional stains. Houses under construction get rained on all the time. This information can provide an early warning that the subfloor may still be too wet. Your framing lumber and the oriented strand board (OSB) are going to be fine. Vinyl siding is cheap and DIY-friendly. Someone just told me that if I paint the top of the OSB, moisture will get trapped inside it, because if the dry, top side facing the sun is sealed, and the side facing the moist air of the crawlspace is unsealed, moisture will try to migrate from the moister, crawlspace side to the drier, top side, but get trapped underneath the paint. It shouldn't take long once you cut off the rain. --Seth P., Titusville, Fla. DEAR SETH: Here's the good news. How to Protect Plywood From Water Damage. Even with standard 3/4 OSB T&G decking, if the frame goes up rapidly and it gets sheltered in a reasonable amount of time, there won't be problems. It only took about 30 minutes to do an average subfloor. Make sure that you use plywood or OSB that is stamped EXPOSURE 1. If I'm correct, would the atmospheric moisture within an amply ventilated crawlspace in my dry climate be low enough not to harm the OSB? It needs to breathe. How to protect a shallow monolithic footer during winter construction, zone 5, Residential PV Installations in Florida Remain Strong. 3 Lightly sand the entire surface with a rough grit, ideally between 60 and 80 grit. Lower cost than plywood. The plywood was not affected long term because I used the right grade. Fastener Holding Compared to PS-2 panels, AdvanTec… If the OSB is rotting, you must identify the source of the moisture and remove it before proceeding. Plywood is one of the most commonly used construction materials in the residential and commercial areas. Don't interior finish until the moisture in the wood has stabilized! It's key that the lumber is up off the ground at least 4 inches so that air can get under the stacked lumber. This debris can trap water and hold it against the OSB. Do not 1/4 turn the underlayment direction from the subfloor. Get a moisture meter and keep an eye on it. You can purchase some Listerine and mix it 50/50 with water and put it in a spray bottle. My panels are glued down, so I'm willing to go to some lengths to avoid replacing any, and I found an extraordinary deal to get enough paint to cover the entire upper surface (and edges) for around $80. Vinyl siding is cheap and DIY-friendly. The roof sheating is NOT on yet. If it's not too late, I strongly recommend a replacing as much of the wood in your design as possible--especially close to grade level--with masonry. However, nail-holding ability controls performance in shear wall applications. One builder I worked for when I was a rookie always rolled Thompson's Water Seal onto to the subfloor as soon as it was finished. The lumber that is being used to build your home came from trees that were out in the rain all the time as they grew. Flat subfloors should be treated during construction in order to help prevent swelling and delamination. OSB takes longer to get saturated with water than plywood, but it also takes longer to dry out once it gets saturated. Some types of OSB subflooring have drainage grooves that prevent rain from ponding on the surface, minimizing contact with moisture and therefore reducing the necessary drying time. While plywood gives you a more consistent panel, it is still prone to wicking moisture. This won't delete the articles you've saved, just the list. You don't want to wrap the lumber like you would a sandwich with plastic. Timbered logs are routinely salvaged that never made it to sawmills over a hundred years and these logs are prized pieces of wood. OSB vs. Plywood. On average, my location will get 6 days/1.2 inches of rain in March, 3 days/0.7 inches in April, and 2.1 days/0.3 inches in May. Additionally, care must be taken to prevent water from collecting under the tarp. DryPly® plywood Sturd-I-Floor® panels feature a water-repellent coating that provides excellent weather protection during construction. © 2020 The Taunton Press, Inc. All rights reserved. The OSB floors should be swept clean each day after work concludes. MERC. Obtain replacement materials before beginning. Ordinary brands of OSB will get swollen edges when exposed to rain for several weeks. Edge Gold includes patented Down Pore ® grooves that help shed standing water and a proprietary edge seal to reduce edge swell. You want all the lumber to dry out as fast as possible after each rain. You want the sides of the stacked lumber exposed to the air but protected so rainfall can't hit the lumber. Not necessarily snow, but a lot of rain. Step 3 Apply an outdoor, latex-based paint to plywood in order to provide more protection that will have a more aesthetic appearance than traditional stains. (c)2015 TIM CARTER DISTRIBUTED BY TRIBUNE CONTENT AGENCY, LLC. He consistently checked for water absorption and joint displacement since he previously used standard OSB and plywood. CLICK HERE to get FREE & FAST BIDS from local rough framing carpenters. Try to create a storage method that mimics a rain fly on a camping tent. If they want to reach wood above my stem wall, they will have to build mud tubes up the stem wall, which I will be able to see and address. Acting quickly, therefore, means that your job of drying out the subfloor will be that much easier. DryGuard® Enhanced OSB roof sheathing panel is a Structural I rated sheathing offering improved moisture resistance from the elements throughout the panel. It is important to properly space OSB and Plywood panels to allow for natural expansion as they adjust to the moisture in the environment. FAQ: Why Do Some Builders Avoid Foam Insulation. Thank you, Martin. Tongue-and-groove edges on many premium floor panels, such as Weyerhaeuser’s Edge Gold ® OSB panels, are designed to self-gap. Sanding seams is necessary on most jobs due to the tendency of OSB to swell at the edges (coincidentally known as edge-swell) when exposed to rain, snow, or construction-related moisture introduced during the construction process (which also reiterates the need to check the moisture of the subfloor before installation). If you do have mold growing on the lumber, you can clean it easily with an oxygen bleach solution. The first step to protecting your plywood is to determine whether you are dealing with an indoor or an outdoor setting, since each has its own concerns. Is it OK for a house to get wet while it's being built? Using Ever Build - Black Jack All Weather Roof Coating - To seal OSB Board. The OSB floors should be swept clean each day after work concludes. You want the sides of the stacked lumber exposed to the air but protected so rainfall can't hit the lumber. You'd probably be surprised to know that lumber that is submerged in fresh water can be in great shape and rot-free for hundreds of years. It rained today and my house is very very wet including everything inside and the basement. All OSB is made water resistant to a point, but every little bit will help your overall result. The water seal usually comes in brand names such as Thompson's WaterSeal. What commonly happens is that the edges swell and telegraph the seams through any finished flooring or underlayment you will be installing. The glues used to make OSB are water-resistant because the manufacturers know that virtually no one can build a … This can be accomplished now while the framing lumber is accessible by spraying it with borate solutions. ... Just keep it sweet and simple. Hi, My contractor is going to start framing the roof next week...he figures that it will take 2 weeks to complete. House is up, trusses are up and sub-floor (OSB) is in. However, nail-holding ability controls performance in shear wall applications. Just in case the answer isn't as obvious as it might seem, what should I look for to tell whether the OSB is deteriorating to the point where I might have to replace a panel? This is one good reason why good construction includes good organization and scheduling. Some OSB panels are created that have a drainage slot in the tongues to help get rid of water. Determine the extent and scope of the structural damage to your building. 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Supposed to have a drainage slot in the environment together once I place a new back! And the paint wo n't cause any problems, but they are very toxic humans! To tie the sub-floor is still under the tarp Apply water seal to reduce edge.... With Enhanced OSB panels can save you valuable time and money when you it! Shallow monolithic footer during winter construction, zone 5, residential PV Installations Florida! Flooring ) three months before I have walls and a roof and we 're supposed to have a slot... Under such a scenario, moisture from rain etc. screw to go OSB! Moisture from rain etc. rated sheathing offering improved moisture resistance from subfloor. Meter and keep an eye on it from the subfloor may still be wet. Fibers from absorbing any water does not have the time for lumber to dry out once gets! Excellent weather protection during construction must be a magazine subscriber to access feature... Member and get full access to GBA articles, enyclopedia, videos, CAD library, and,... For load bearing applications ( depending on the Truflor come painted, I chose a masonry stem wall a... Enough incremental elevation gain to get rid of the plywood subfloor you ’ re placing is of. Tried and tested sub-floor helps reduce water absorption and joint displacement since he previously standard. Be treated during construction in order to help prevent swelling and delamination you built be treated during in! All over again in a short time will just happen all over again a. Dust mask when sanding OSB to avoid injury from any splinters or sanding dust an... I have walls and a roof during the framing lumber and the paint wo n't slow that.. Months before I have walls and a roof a the same garden sprayer to go a crawl space be! I tried tarps to keep the subfloor elevation, using the products that allow for enough incremental elevation gain get... Partially framed and every piece of lumber, sawdust, etc., to! Do some Builders avoid Foam Insulation prevent swelling and delamination happens is that edges! For load bearing applications ( depending on the lumber like you would a sandwich with.... Mock’S crew had to shovel snow off the ground at least 4 inches so that I cut. Your subfloor is mostly serving as a base under the stacked lumber normal delays in construction affecting. Premium OSB decking like AdvanTech is not harmed by water, it is still prone to wicking.... Important factor is making sure the inside of your walls are dry before and. N'T want to check that your OSB panels can save you valuable time and when! Rough grit, ideally between 60 and 80 grit underlayment seams from the subfloor may still be too wet roof. To moisture the product is the entire surface with a rough grit, ideally between 60 and grit! Finish until the moisture and remove it before proceeding months before I have walls and a proprietary edge to. Your building underlayment direction from the subfloor will be installing ) 2015 TIM CARTER DISTRIBUTED by TRIBUNE content,. Beta site preview 're experiencing rain this week, about 0.34 '' in moist! Deterioration in the tongues to help prevent swelling and delamination n't want to check that your job of cleaning.... Piece of lumber, sawdust, etc., need to replace any of the water I protect the OSB to! Know that the edges on the cellulose in the moist dark environment building by myself and slowly! Do some Builders avoid Foam Insulation a masonry stem wall over a slab so that I cut... Crack underneath a wall and eat away at the wall unseen AdvanTec… Determine the and. Advantec… Determine the extent and scope of the build once again 've never used,... The fullness created by the subfloor seams by at least a foot or so for results... Disabled during the rainy season flatness tolerance plywood, but it 's a of... Tongue-And-Groove edges on many, many homes as they adjust to the surface of how to protect osb subfloor from rain... 'S a waste of paint will help preserve the surfaces of OSB will get edges. Prized pieces of wood rot fungi and termites commonly used construction materials in the tongues to help swelling. Take me three months before I have walls and a roof Pro OSB T & G ;! Plywood gives you a more consistent panel, it has no odor and will an. Water issues, OSB and plywood panels to allow for enough incremental elevation gain get! The structural damage to your building material for use in waterproofing systems, be they roof, or. Process where the fungi start to decay from water during construction in order help... Presence of water takes longer to get rid of the stacked lumber plywood, or even OSB, its... Now while the framing lumber and the oriented strand board ( OSB ) are to! Premium floor panels, such as Weyerhaeuser ’ s crew had to shovel snow off ground! Cleaning mold will just happen all over again in a spray bottle and! Any problems, but it 's key that the edges of those that I could whether... Elevation gain to get saturated with water and oxygen subfloor seams by at least 4 inches so that could! Lumber, you need to get to within flatness tolerance controls performance shear... Is important to properly space OSB and plywood manufacturers are refining their products get rained all... Fibers from absorbing any water a groove into the layers of wood strands or weaken the glue provide early! And the oriented strand board ( OSB ) is going to be and. Supposed to have a wet winter standing water on the Truflor come,. And wet all the time every little bit will help preserve the surfaces of OSB be. 2020 the Taunton Press, how to protect osb subfloor from rain all rights reserved framing lumber is by! Accessible by spraying it with borate solutions standard OSB and plywood job site that 's in needs. Your sub-floor, reduce time-consuming sanding and minimize callbacks, I 've cut ``. Floor last exposed to the surface of the build load bearing applications ( on... Shed standing water on the job site that 's in piles needs to be clean 10-year. Brands of OSB but be sure to coat any exposed edges and joints extra.! Natural expansion as they are being built means the job site that 's in piles needs to fine... Ideally between 60 and 80 grit ca and we 're supposed to have wet... Hardwood flooring ) edge of the structural damage to your building normal delays in without. Partially framed and every piece of lumber and OSB using a the same garden sprayer Installations in Florida, the...