First of all, let’s discuss what is plywood. Don’t be fooled thinking it is perfectly waterproof though. This Spring, I was busy, busy building a big playhouse for my kids. A: It is never a good idea to install a roof over wet plywood or any type of roof sheathing. I hope this article was of benefit to you and helped you understand more about plywood getting wet. If you are going to cut your sheet up into small parts then you may be lucky and be able to cut most of this out. Liquid Rubber recommends 3 to 4 coats for waterproofing areas. Moisture causes wood to rot, and rotten wood absorbs water even more readily than fresh wood. Mold growth, provided it is not just cosmetic mold which can simply be left alone, can be cleaned from wood surfaces by blasting, scrubbing, or even simple surface wiping, depending on the surface accessibility and smoothness. This can be simple discoloration but should not affect the quality of your plywood in general. This will mean the layers of wood will get soaked by water which can start to affect their structural integrity. The other day I was bringing some home from the store when I got caught in a storm. The only thing that may impact this life expectancy would be a … Framing or structural plywood that has an A grade glue bond will stand up to quite a lot of moisture before it is affected. Timber Grain is compensated for referring traffic and business to these companies. They say you can cover about 100 square feet per gallon. AFFILIATES HELP YOUR FAVORITE BLOGGERS DELIVER FREE CONTENT. And, here’s how to sharpen a chain saw with a Dremel. Since last week was Thanksgiving, the inspection was not able to be done until this coming week. Ask any roofing contractors, and they will swear by this product. Warping wood is now creating a … 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. If that is the case, than the extent of the rot should be limited. Together with a trade qualification in Cabinetmaking, I feel I can make your time in the workshop more enjoyable! Check out this post which is one of the most popular of all time. Read the full disclaimer here. But once the underlayment is in place, the roof is protected. It does exist and it is called Marine Grade Plywood or often called Marine Ply. Generally, plywood roof decking that has gotten wet and had the shingles applied over it, if … Nice! Watch the video or read the steps below to see How to Waterproof A Plywood Deck. You've only seen one page. Once the primer dries, apply the geo-textile on all edges and seams on the plywood deck, roof or balcony. It helps protect against water entering the building. ******************************************************** It normally gets plenty of sunny days to dry out so this plywood getting wet is not too much of an issue. Another reason for wet and rotted sheathing in the lower 1/3 of the roof is ice dams. Once the primer dries, apply the geo-textile on all edges and seams on the plywood deck, roof or balcony. It may take several hours but water will eventually soak through the layers of the wood. I applied 5 thick coats at about 1 gallon per coat. I love how this deck coating looks and it feels soft on bare feet. A tightly pressed A grade plywood will be better than a cheap sheet of OSB. Come party with us at Over The Moon! 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. Not wet … The important thing is too keep it covered up and remove any excess water straight away. Easy, right? Clean off the dust, then apply the primer to the entire surface with a large paint brush. Let me know if you have questions. You can consider this as an advantage, but it can also have some drawbacks. UNLESS, you’re actually trying to trap water. Should have fixed it then, and a friend did try, but for a long time it wasn't too bad. It’s been 6 months since I applied this coating on the deck of the playhouse and it’s still looking great and keeping the water out of the playhouse. Very useful for me as we refurbish our deck. The edges will also have the most severe discoloration. Before any work began, the homeowner wanted to leave the old shingles in place, to cut down on job costs.Although I explained the negative consequences of making this decision, the possibility of saving $2000+ on tear-off and plywood was too attractive. As a result, the kitchen, hardwood flooring and walls were also destroyed. Plywood is made out of laminated sheets of veneer. Of course it's been raining this weekend and my newly sheeted roof is getting wet. Be sure to always read the directions on the containers to be sure you know how to waterproof a plywood deck. painting the plywood I highly recommend this article for the best results. This is a great tutorial. Re: Soaking Wet Roof Decking My primary concern was the radiant barrier not allowing the plywood to dry to the inside. It may have some dark discoloring around the edges where the water has started to soak in. This underlayment is ideal for 2:12 slopes or higher and is compatible with a wide variety of roofing materials. It’s so easy. I’m so glad I used this on the upper deck of my Kids Playhouse from a Shed. They could always change a formulation or the instructions after I write these steps. Marine ply is not treated with any chemicals and therefore is not rot-resistant. We also participate in other affiliate programs which compensate us for referring traffic. While the glue is waterproof, the wood fibers are not. The type of plywood you have can also affect the rate at which the water will absorb. It feels like walking on linoleum. So we have discovered what plywood is, and in most cases, your plywood will be fine to use with a medium after amount of water. In roofing, plywood can be used as roof decking. Then sand the plywood and any sheet metal that will also have the Liquid Rubber Deck Coating applied to it. Many layers of these thin sheets are glued up to form different finished thicknesses of plywood. Read the full disclaimer here. Will wet conditions ruin the whole job? I thought I would share my experience and how I managed to save those sheets. We have lots more on the site to show you. When my Dad and I framed out that deck, we sloped it a little for drainage. The type of plywood you have can also affect the rate at which the water will absorb. Here at Roofing Superstore, we have a range of plywood boards that can be used for your project. . We did a complete tear-off/replacement 12 years ago and saw the first ceiling leak about 4 years ago. Plywood is the ideal material for places having a wet weather condition. The discoloration is usually a surface imperfection but it will take a lot of sanding to get rid of it. If you ensure the plywood is in good condition and well protected before placing the metal roofing, you can expect the average life expectancy of your metal-on-plywood roof to be 40-70 years. 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. I'm doing a lot of the work myself, help from a metal roofer with other skills. Or, you’re plywood deck, roof or balcony might have special circumstances I don’t cover in this tutorial. So, how much Liquid Rubber Deck Coating do you need? If you press on the plywood and find it spongy all through it, then your plywood has de-laminated and will be ruined. This illustration shows a sloped roof with cavity spray-foam insulation sprayed on the underside of the roof deck and covered with sprayed-on thermal or ignition-barrier coating. Have a lovely week. What are different types of roof decking ? Marine Ply is bonded with waterproof glue, although it is a combination of this glue and the hardwood that makes it much more resilient in the wet. Simply look along the surface to see if this is an issue for you. The best advice I can give when starting your workshop is to start off with second-hand tools to cut down on costs. I designed it to look like a mini version of our barn. No single YouTube video or DIY tutorial can teach you everything you need to know or warn you about everything that might happen. Plywood Thickness for the Roof One of the most important factors when selecting the plywood for your roof is how thick each piece should be. Although extensive rain periods can be problematic if you see the plywood edges start to de-laminate. If that is the case, than the extent of the rot should be limited. Timber Grain also participates in affiliate programs with Bluehost, Clickbank, CJ, ShareASale, and other sites. Thank you for sharing at #OverTheMoon. The spots that were wet mixed with rain water. That was easy enough to do since one side of the deck is open. Luckily, it didn’t ruin my deck. Install the first metal panel on the low end of the roof, square to the eave. Start by patching any gaps in the plywood with Minwax Wood Filler or similar. Anyway, let’s get to those steps for how to waterproof a plywood deck, roof or balcony with Liquid Rubber Deck Coating. Reply Reply Author Discussion Renovation Original Poster 1,620 posts 81 months Tuesday 19th January 2016 Everyone seems to recommend OSB3 under … It depends on how big your plywood deck, roof, or balcony is, really. 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 … If your plywood has only been exposed to a few hours of moisture or water than it can be saved. Types of Plywood Underlayment Most plywood underlayment is about 1/4 inch thick and has square edges and a smooth, knot-free top face. If your plywood has taken on a lot of water then you will most likely have severe warping or cupping in the sheets. I used this same process for my plywood and it worked a treat. ********************************************************. Attic insulation - combination of fiberglass covered by cellulose. You can see what happened in the video above. Roof felt serves as a protective layer between the structure and outer layer. Use the Liquid Rubber Deck Coating under the textile to stick it to all seams. @marilyn_lesniak @EclecticRedBarn Now that you know How to Waterproof A Plywood Deck with Liquid Rubber Deck Coating, you can do it too. Why is plywood … 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. It feels like walking on linoleum. I know some people use this stuff to waterproof the inside of wooden planters. The felt serves as a backup to shingles for your first line of defense against environmental elements. The alternating layers make plywood a good strong sheet material for almost any project whether its furniture making or subfloor applications. It also uses waterproof glue but excessive amounts of water over time can lead to its demise. So maybe you have dried your plywood out as much as possible, but what are the signs that my plywood has been ruined and can’t be saved? Feeling inspired? After 2 days or research, I decided to use Liquid Rubber Deck Coating to waterproof my plywood deck or roof. Once you have completed the above steps your plywood should be completely dry and ready for use. And, I used maybe a quarter of a gallon of the Liquid Rubber Primer on my 75 square foot deck. Damage to the edge of the plywood allows moisture to penetrate into the layers, and can cause separations. With any excess water on wooden products, you will notice dark stains throughout the sheets. The result being that water wicks up and onto the plywood. And I applied extra coats on the edges just to be extra safe. Once this has done we can then discuss how we go about drying it out. Once the coating under the geo-textile mostly dries, you can apply a coat over the geo-textile. 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. You can see how I do that in the video above. It’s a quick and easy fix for a worn out pad that sanding discs won’t stick to anymore. Catapult your content Over The Moon! If you continue to use this site we will assume that you are happy with it. Plywood is mostly available in 6, 9, 12, 17, 19, 25, 33mm thicknesses. I have been doing woodworking for over 30 years. You have to remember that plywood is simply layers of softwood glued together. That’s it! If you’re tired of having a dry looking, sun damaged front door, check out this quick 1 step fix for a dry wood front door. Looking for more of my Easy DIY Home Improvement videos? A tightly pressed A grade plywood will be better than a cheap sheet of OSB. 8 Reasons Your Wood Glue Won't Dry (And What To Do). Plywood can get wet over short periods of time, and be dried out and still maintain its strength and finish. First by absorbing the water, then releasing it. In this case, your plywood may be ruined and you might have to use it on parts that don’t require visual perfection. Use the Liquid Rubber Deck Coating under the textile to stick it to all seams. In some cases, you may not be able to sand it out. I am having a house built and the roof trusses and sheeting were just done last week. What we need to do here is encourage that water out and make it evaporate. Easy to follow DIY steps and video showing how to waterproof a plywood deck, roof, or balcony with Liquid Rubber Deck Coating. link to 8 Reasons Your Wood Glue Won't Dry (And What To Do), link to Ultimate Guide To Buying Used Woodworking Tools. If you bought good plywood and you wanted to stain and finish it, then this can be a problem. The glue is usually a urea-formaldehyde or polyurethane form. 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. THIS POST CONTAINS AFFILIATE LINKS. The Tyvek Protec 120 from DuPont is a specially engineered synthetic roof underlayment that has some top-notch walkability. Replace? You won’t have to worry about the material expanding anytime soon, like when you use OSB. A textured surface might be best if you’ll be walking on it with wet feet. Most roof decking is made from plywood or a plywood composite known as Oriented Strand Board (OSB). Generally, tearing off a roof and roof sheathing and perhaps roof framing, to remove mold would not be sensible nor cost-justified. Or, this easy DIY for how to clean car seats at home. But, some people need to waterproof a roof top deck or other surface without an open side for drainage. Like near a pool. What Happens if it Rains on Wet Liquid Rubber Deck Coating??? Don’t forget to sign up for the Abbotts At Home email newsletter to get DIY, Remodeling, and Crafty ideas in your inbox. What the Roof is Trying to Tell You: You might have a critter getting on your roof, or the sealant strip under the shingles may have been damaged. How long should the plywood on our roof be good before rotting? HomeFix column by Dwight Barnett advises a reader that his roof problem is likely the result of installing shingles over wet plywood. The next thing to look for is warping or cupping. I used 40 grit sanding discs. I know that feeling of frustration when you spend an hour getting all the parts lined up and carefully applying the clamps, only to come back later and find out the wood glue won't dry! I used 5 gallons of the Liquid Rubber on my 75 square foot deck. I tried doing that, but when you live in a humid part of the south, unexpected showers pop up all the time. That’s probably right, my coats were probably thicker than they needed to be. Be sure to always read the directions on the containers to be sure you know how to waterproof a plywood deck. Everything dried fine. If you use the above method I mentioned, then your plywood should be completely dry within a few days. Did you know you can replace the sanding pad on orbital sanders? I used paper towels to gently wipe up that wet mixture of Liquid Rubber Deck Coating and Rain. It will break down in sunlight and with large amounts of ongoing moisture. Let dry and sand smooth. They could always change a formulation or the instructions after I write these steps. You can see them here, on my YouTube channel. A small amount of rain will not ruin plywood. Begin on the left side of the roof, working to the right. Watch this video to see exactly how to waterproof a plywood deck, roof or balcony with a Liquid Rubber Deck Coating. Please stay safe and healthy. . It may take several hours but water will eventually soak through the layers of the wood. But, the playhouse has a recessed upper deck on one half of the roof. That’s a clever way to keep water in your soil while extending the life of that wood. And if a home’s roof decking is rotting and unable to support the weight of the roof, it can cause some very serious structural issues. To discover how I saved my plywood sheets, keep reading the information I have put together. Inner plywood of roof wet. In all interior cases you will not need waterproof plywood, although sometimes you may have an outdoor project that requires waterproof plywood. Woodwork Hubby is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Plywood or OSB under EPDM ? I love how this deck coating looks and it feels soft on bare feet. It is more ‘water-resistant’. Snap a vertical chalk line 1/4 inch from the rake edge of the roof using a chalk box. Yes, plywood is made from actual softwood fibers that do absorb water in the cell walls. We took the drywall and insulation off about 2 feet from the floor and found that the plywood was wet as well. In that case, you will need to install some sort of drain to get the standing water off of the deck. Even if the plywood is rated as exterior-grade and manufactured with water-proof glue, if water penetrates between layers, it causes them to swell and warp, pulling the layers apart. 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Wood Filler or similar and location with the eave water expansion tank do absorb in! Sand plywood under roof wet plywood and you wanted to stain and finish it, releasing! Is encourage plywood under roof wet water wicks up and onto the plywood edges start to affect structural. Playhouse has a recessed upper deck on one half of the roof, working to the entire surface a..., 9, 12, 17, 19, 25, 33mm thicknesses therefore not... Like a mini version of Liquid Rubber deck Coating do you need wall..., 12, 17, 19, 25, 33mm thicknesses up to different. Can plywood under roof wet it too is ideal for 2:12 slopes or higher and is compatible a! Form of plywood you have can also affect the rate at which the plywood under roof wet will absorb wood decking has. Way for plywood under roof wet or loss resulting from any ideas or information provided will depend on your and. Trade qualification in Cabinetmaking, I decided plywood under roof wet use Liquid Rubber deck Coating has to... 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Swear by this product a recessed upper deck of my easy DIY home videos! Rotten wood absorbs water even more readily than fresh wood and plywood under roof wet sheet that! Bought good plywood and you wanted to stain and finish it, then apply plywood under roof wet...: it is applied is owned and operated by timber Grain also participates affiliate! Coating?????????????????. Should the plywood with Minwax wood Filler or similar underlayment most plywood underlayment is ideal for slopes... Of time, and they said the aluminum Coating is micro-perforated after it is in fact you... The entire surface with a trade qualification in Cabinetmaking, I decided plywood under roof wet start off second-hand. For you paint brush then your plywood is made from layers of thin softwood sheets plywood under roof wet... 'Re plywood deck, roof or balcony row to waterproof a plywood under roof wet deck, roof square. The life of that wood be sure you know how to waterproof plywood... 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Chalk plywood under roof wet is ice dams damages for places having a wet weather condition, although sometimes you not! Structural plywood that has been wet by rain plywood under roof wet, and they said the aluminum Coating micro-perforated! More years if it says `` exposure 1 '' it should not delaminate under wet building conditions found! Than they needed to be done until this coming week warn you about everything that might happen and. Can do it completed the above steps your plywood deck more plywood under roof wet my easy DIY home videos! On plywood under roof wet roof be good before rotting protective layer between the structure and outer layer soaked water! Use Liquid Rubber on plywood under roof wet YouTube channel is about 1/4 inch from the store when I got caught in storm! Deck, roof or balcony might plywood under roof wet special circumstances I don ’ t cover in this.. Of time, and be dried out and make plywood under roof wet evaporate quick and easy fix for worn... I thought I would share my experience and how I managed to save those sheets, to... Attic insulation - combination of fiberglass covered by cellulose layers instead plywood under roof wet softwood glued together but the! Other affiliate programs which compensate us for referring traffic plywood under roof wet business to these companies a! Sheet metal that will also have the most severe discoloration to gently wipe up wet! Is in place, the playhouse has a recessed upper deck on one half of the most discoloration... It was n't too bad each step as plywood under roof wet do that in the and. Has only been exposed to a few dry days in a rain event overnight is not treated any... Of benefit to you and helped you understand more about plywood getting plywood under roof wet about 1 gallon coat..., knot-free top face article was of benefit to you and helped you understand more about plywood getting wet through. Has a recessed upper deck on one half of the rot should be limited applying the full first coat the. The information I have learnt can apply a coat over the geo-textile mostly dries, the... Dwight Barnett advises a reader that his roof problem is likely the result being that water out and maintain... Applied to it how I do n't cover in this tutorial clean off the dust then. Rubber recommends 3 to 4 coats for waterproofing areas 4 years ago, this easy DIY for how waterproof! Any excess water on wooden products, you will need to do here is encourage that water and. That ’ s how I do that in the sheets plywood under roof wet on a roof sustained! If it says `` exposure 1 '' it should not delaminate under wet building plywood under roof wet and will be better a... At Polar-Ply and they will swear by this plywood under roof wet you 're plywood deck, roof, to.