How to Waterproof a Bathroom Plywood Subfloor | eHow. What should I use to seal the joints between two pieces of concrete backer board in a bathroom? What is the proper waterproof bathroom underlayment for vinyl tile flooring? However, because wood is a naturally porous substance that will absorb moisture, when used as a basement subfloor, these materials are often installed on mini-joists known as "sleepers," which allow it to sit above a concrete pad. Preparing subfloor for tile and waterproof. Plywood subfloor waterproofing. The most common type sold in home improvement stores is the paint-on or spray-on type of waterproofing. Plywood as a Subfloor Material. When you're finished, let the wood cure for several days before using it. Once they dry, they form a plastic, protective layer. The main source of water leakage out of a bathroom, which you will likely not be able to prevent, is inside the walls. Use 1 5/8-inch screws for 1/2-inch backer board. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. If you are waterproofing a shower recess, apply primer at least 6-feet up the wall. Using the right type plywood ensures a long-lasting floor. To fully waterproof the room, apply primer to the walls as well, up to about half a foot from the floor. Do native English speakers notice when non-native speakers skip the word "the" in sentences? A poly or acrylic topcoat will seal the cracks between planks and help protect the flooring; your flooring dealer can probably recommend a product that's compatible with your particular brand of laminate. Understanding the Upgrades: Enhanced Plywood and Subfloor Products. Minimizing joints in supply pipes, which can swell and shrink at different rates with temperature, and making sure all joints on all types of plumbing are well-sealed, are key to minimizing leaks. Screws spaced every 6 in. Plywood will start to rot when it’s exposed to water too often. Make sure that the laminate, once installed, is well-sealed; laminate's great for providing a wood-like floor, but if water gets under the waterproof (or water-tolerant) top layer of the laminate and into the particle board underneath, the boards will swell and your floor will be ruined. When could 256 bit encryption be brute forced? Water can damage more than just the flooring in a bathroom when it gets in underneath of it. How to Lay Vinyl Floor Tiles in the Bathroom. Should I replace bathroom OSB subfloor with plywood? Oriented strand board model fg10006 4 51. Any plumber worth his salt will use the appropriate joining materials liberally (solder and flux for copper pipe, glue for PVC/HDPE, rings and cement for PEX). An outdoor siding application, on the other hand, would require a full protective coat of a waterproofing layer either painted or sprayed on to fully protect the plywood from continual bombardment. CDX plywood (¾”) in particular is used often because it … The plywood would be laid for the entire floor; the concrete board and laminate only for the areas not covered by the shower. It is relatively simple to waterproof a floor made from ceramic tile. There will be a pre-fab shower and I'd rather not do any tile in this bathroom. Where you really need to take care is in the shower area. Use 1 1/4-inch screws for 1/4-inch backerboard. (From the top to the bottom layer). Can I use a different AppleID on my Apple Watch? Wipe the excess caulk … Traditionally, exterior grade plywood has been the subfloor material of choice for many bathroom flooring projects. To stick the membrane down, use either a paint roller or brush to paint over it with the waterproofing agent. An alternative—and some say the replacement—for plywood is oriented strand board, or OSB. Can you use MDF for subfloor? Lay the membrane down so that half is on the wall and the other half on the bathroom floor covering the crack. When installing a protective layer for your plywood installation, it is vital to follow the recommendations of the manufacturer of your finish product. Plywood is made by gluing alternating layers of wood veneer. CDX plywood (¾”) in particular is used often because it has a high level of resistance to moisture and humidity. The floor must also handle the weight of the tub, shower, tiles and other fixtures. If you are sitting at your house and trying to decide if this is for you—you want to judge the health of your plywood floors—because while you can paint a plywood subfloor—it’s actually very challenging to paint a plywood subfloor that’s damaged. 2) What's best to put on top of the sub floor. How do you waterproof a bathroom subfloor plywood? What to do? A subfloor is the layer at the very bottom of your shower pan. It comes in indoor and outdoor formats and can be used for a wide variety of applications ranging from subfloor installations to the underlayment for a ceramic tile countertop to the primary layer for outdoor siding. concrete board. It's not a good idea to use it in any situation where water can easily get under it, since water can cause it to swell or become trapped beneath it leading to mold. Place the angled part of the nozzle flat against the crevice between the subfloor and the bottom of the wall and squeeze the trigger slowly. Some experts also recommend coating the panels with a waterproof … Wood panels, such as plywood or oriented strand board, are common subfloor choices. You probably won't know there's a problem until you hear water dripping onto your ceiling, or see that telltale tea-stain on a ceiling or wall. how to waterproof a bathroom plywood subfloor hunker . Penetrating oils and sealers are another form, and sheet plastics and interlocking membrane systems are available as well. Linoleum is a common choice for kitchen and bathroom floor coverings. The bathroom floor gets wet. Plywood is one of the most commonly used construction materials in the residential and commercial areas. How can I properly vent a basement toilet & shower using an AAV? I'm tiling an upstairs bathroom. Allow to dry for at least 4-hours or the minimum time recommended by the primer manufacturer. However, a plumbing emergency can pose a greater threat. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. While I prefer using 1/2” cement backer board over a plywood subfloor, you may be able to get by with 1/4” backer board instead. Rated 4.91 out of 5 £ 47.50 – £ 435.00 Select options; This photograph shows another 5 sheets of siding plywood. Thanks for contributing an answer to Home Improvement Stack Exchange! His has been published online through GTV Magazine, Home Anatomy, TravBuddy, MMO Hub, Killer Guides and the Delegate2 group. Drag the side of your thumb along the bead of caulk to press it into the crevice after every 3 to 4 feet. Repeat this until all of the gaps on the floor are covered with membrane and painted over. Similarly you need to follow the recommendations of a siding manufacturer for protecting the plywood underneath the siding of your home. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Traditionally, exterior grade plywood has been the subfloor material of choice for many bathroom flooring projects. waterproof plywood subfloor for gallery. Granite Vs. Travertine for Showers: Will It Leak? [10 STEPS] WATERPROOF YOUR BATHROOM WITH SEALING SOLUTIONS (SAM) Whether it’s renovation or new construction, waterproofing is necessary for any type of bathroom or wet area. How many treble keys should I have for accordion? The application method you use is based on a variety of factors, depending on whether you are using the plywood as a finish material or a building material. Mass resignation (including boss), boss's boss asks for handover of work, boss asks not to. Finished plywood generally relies upon spray-on sealers and preservatives to retain the look of the wood. How to holster the weapon in Cyberpunk 2077? Is Exterior Plywood Good for a Porch Floor? How to Tile a Bathroom Floor. This prevents the transfer of liquid water between the layers of the floor, while still allowing the layers to adjust to changes in humidity without forming condensation. Most of the liquid waterproofing substances and sealers can be either applied with a brush or a roller or sprayed on using the same electric sprayer used for paint. The most common type sold in home improvement stores is the paint-on or spray-on type of waterproofing. If the flooring hasn't yet been installed, it is best to lay waterproof backer board over the subfloor. Did COVID-19 take the lives of 3,100 Americans in a single day, making it the third deadliest day in American history? A subfloor is installed on top of a structure's construction floor and provides a flat, level surface for finish .....>> Subflooring and Subfloor Products - Bob Vila. Plywood as a Subfloor Material Traditionally, exterior grade plywood has been the subfloor material of choice for many bathroom flooring projects. Apply a bead of the silicone caulk around the entire perimeter of the subfloor. What should be done about water under bathroom floor tiles? To waterproof wood, start by sanding it with fine grit sandpaper to remove any imperfections and prep the surface. Cut the waterproof membrane into lengths of the bathroom walls. Apply a bead of the silicone caulk around the entire perimeter of the subfloor. He spent more than 15 years as a third-generation tile and stone contractor before transitioning into freelance writing. Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. Plywood is made by gluing alternating layers of wood veneer. Then, use a rag to apply an even coat of linseed oil, walnut oil, or tung oil to the wood and let it cure for 24 hours. How should I waterproof an upstairs bathroom floor? In areas where the wood will come into contact with water or moisture over time, it is necessary to protect it from the elements so it will not rot or develop mold. We can significantly enhance the resistance of plywood to the ingress of water with Smiths CPES. Are there official rules for Vecna published for 5E. That usually means the underlayment and the subfloor also get wet. Can we waterproof plywood with Clear Penetrating Epoxy Sealer? waterproof plywood flooring, waterproof plywood … A wide variety of waterproof plywood flooring options are available to you, such as graphic design, others, and none. Tim Anderson has been freelance writing since 2007. before finish flooring is installed on top of a plywood subfloor, you must waterproof the subfloor, especially in a bathroom. Ensure the entirety of the room has a smooth, even layer of primer. How do i waterproof the joists under my bathroom floor? Generally, paint-on and interlocking membranes are used when the plywood is under tile or natural stone installations, while overlapping is used for exterior siding applications, under the layer of siding. When a roofless, partially built structure takes on water, the plywood or OSB used for … For example, for plywood under ceramic tile, you need to follow the recommendations of the tile manufacturer for the best type of waterproofing method. I'm adding on a bathroom upstairs. Often the subfloor consists of plywood that is nailed or screwed to the construction floor. These typically are liquid latex substances applied to the surface of the plywood while wet. Before finish flooring is installed on top of a plywood subfloor you must waterproof the subfloor especially in a bathroom. Run a command on files with filenames matching a pattern, excluding a particular list of files. For example, if you install resilient tiles or sheet flooring over a subfloor, any bumps, dips, or voids in the subfloor may be evident in the finished flooring. [comes in 4x8 sheets, different thicknesses, I'd go with 3/8 or 1/2'][dark gray][There are screws designed to be used in concrete board]. Move the caulk gun evenly along the crevice to apply a bead of caulk. How are states (Texas + many others) allowed to be suing other states? Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Can You Lay Tile Directly Over a Plywood Subfloor? How to Waterproof a Bathroom Plywood Subfloor. Many types of waterproofing are available to protect plywood. Making statements based on opinion; back them up with references or personal experience. Plywood as a Subfloor Material. Underlayment covers subfloor flaws … To subscribe to this RSS feed, copy and paste this URL into your RSS reader. If your plumbing work is up to code, that shouldn't be a concern either. Do I need to do anything after a bathroom flooding? Ceramic tile is a popular flooring, often found in kitchens and bathrooms. CDX plywood (¾”) in particular is used often because it … The subfloor that’s placed beneath bathroom flooring is typically made out of plywood, which is, of course, not waterproof. I forgot to add, if you want to be extra cautious, you could also install an underlayment, something like "Roberts 70-025 Unison 2-In-1 Underlayment", between laminate and concrete board. often the subfloor consists of plywood that is nailed or screwed to the construction floor. It's sitting half above a bedroom and the pipes will be running around the studs. if you do not waterproof the subfloor, moisture can make its way under the subfloor and cause mold growth or other damage.. I'll have new copper, PVC drains and the floor itself I'm worried about. Should I use liquid water proofing membrane over a standard shower mud pan? For example, if you are dealing with an entryway subfloor setting where the water and moisture issues will be minimal, a penetrating oil with an anti-fungal preservative may be sufficient. © Copyright 2020 Hearst Communications, Inc. It is not a terrible idea to install the same type of membrane everywhere in the bathroom, but it's probably overkill especially since you'll be wanting to prevent water even getting that far. Always follow the finish product’s manufacturer guidelines to preserve the warranty for any products used during an installation. To learn more, see our tips on writing great answers. Open Gallery. If you do not waterproof the subfloor moisture can make its way under the subfloor and cause mold growth or other damage. Tile floors are especially heavy with layers of cement board, mortar, tile or stone and grout. before finish flooring is installed on top of a plywood subfloor, you must waterproof the subfloor, especially in a bathroom. Plywood is the most common type of subfloor material used in homes around the world along with particleboard. Place the first sheet of backer board on the mortar. Move the caulk gun evenly along the crevice to apply a bead of caulk. It only takes a minute to sign up. Silicone caulk must be checked for mold or degradation once in a while, but problems are easy to spot unlike hairline cracks in tile joints. My question is what precautions should I take to waterproof it. How to waterproof a bathroom plywood subfloor. Many types of waterproofing are available to protect plywood. Girlfriend's cat hisses and swipes at me - can I get it to like me despite that? Laying a Plywood Subfloor | Flooring Ideas & Installation › How To › Rooms and Spaces › Floors DIY Network has instructions on how to install a plywood subfloor so that it is Plywood is the most common type of subfloor in new homes. Poke the foil at the bottom of the nozzle using the. Place the angled part of the nozzle flat against the crevice between the subfloor and the bottom of the wall and squeeze the trigger slowly. The materials that are used in the floor of a bathroom will also play a role in what’s required for waterproofing – for instance, while compressed fibre cement floor and concrete floors might offer water resistance themselves, if the bathroom floor uses timber-based materials like plywood or particleboard instead it’ll need to be fully waterproofed. For laminate floors, it is generally a good idea to lay down a layer of moisture barrier, like Tyvek, between the sub-floor and laminate, and if the sub-floor is over concrete (doesn't seem to be the case here) another layer between the concrete and the subfloor. If there's just wooden studs at the base, I've done: Should we contact a professional to handle our bathroom repair? Home >> Project Case >> waterproof plywood subfloor for gallery . Windows 10 - Which services and Windows features and so on are unnecesary and can be safely disabled? Add silicone caulk on the edges and that's it. Plastic sheeting will generally need to be tacked or stapled up, while overlapping and interlocking membranes install in a similar fashion. 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. You can also choose from indoor, outdoor waterproof plywood flooring, as well as from 5 years, more than 5 years, and lifetime waterproof plywood flooring, and whether waterproof plywood flooring is villa, hotel, or workshop. QGIS prints proportional circles when value is 0 but not when NULL. In my opinion, laminate should not be used in kitchens or bathrooms. MOSFET blowing when soft starting a motor, TSLint extension throwing errors in my Angular application running in Visual Studio Code, Replace blank line with above line content. Anything special I should do while setting the toilet/sink to keep it waterproof. For the majority of the bathroom floor this should provide ample leakage protection if properly installed. How can I prevent it in future? Repeat the process 2 more times so there are 3 coats of oil on the wood. It's easy to install, it comes in a roll, just put it down on the floor... and it is in one piece and watertight. Plywood is made by gluing alternating layers of wood veneer. Most of the floor of a bathroom should not see any great water leaks or standing water. This material is also often waterproofed before being sold in stores, as indicated by a stamp on the back side. Most homes will consist of a standard subfloor constructed of running boards laid over floor joists, a plywood layer over the running boards, or if on a first floor, the subfloor can be a concrete slab. It can also lead to water damaged subfloor in many instances. Watch the full video https://lowesvideo.com/movie/detail/58 Share. Clear Penetrating Epoxy Sealer – CPES. 3) Should this flooring run completely under the shower? The average puddle you make getting out of the shower before you can towel off will not pose any great threat. There is not a whole lot you can do to prevent this once the walls are up; the keys to prevention are in proper installation of the pipes in the first place. How to put a position you could not attend due to visa problems in CV? If you have a tiled shower, behind that tile needs to be a waterproof barrier which will contain water that gets behind the tile grout (not waterproof) and direct it to the drain, instead of letting it contact the drywall or subfloor. Make sure that the laminate, once installed, is well-sealed; laminate's great for providing a wood-like floor, but if water gets under the waterproof (or water-tolerant) top layer of the laminate and into the particle board underneath, the boards will swell and your floor will be ruined. As Keith mentioned, the biggest concerned with water damage from leakage (since this is a prefab shower), is ensuring your plumbing is done correctly, properly sealed and the right piping used. Today's . Even if you use a waterproof underlayment membrane, the floor will still be … How to Stop a Plywood Floor From Rotting. Asking for help, clarification, or responding to other answers. It’s okay if parts of it are slightly damaged–you can replace those parts. While both are made of particles of wood that have been pressed together, OSB is created when strands of young wood are mixed with resin to form a very hard and pliable board. rev 2020.12.10.38158, The best answers are voted up and rise to the top, Home Improvement Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. Here you will find a short explanation about how-to waterproof your shower area and/or bathroom in 10 simple steps. Walk gently on the panels as you begin to screw the backer board into the subfloor using special backer board screws. But advantech engineered floor panels are made to withstand the elements guaranteed. 1) Is there anything I should do to the studs/drywall underneath to minimize issues in case of a leak in the PVC/copper supply plumbing? Is it safe to disable IPv6 on my Debian server? Plywood is the most common type of subfloor material used in homes around the world, along with particleboard. Plywood underlayment is typically needed when a floor material must have a very smooth, flat surface. I was thinking of doing one piece of laminate flooring, should I put something underneath it, are there certain products that are better? Can replace those parts it into the crevice to apply a bead of the manufacturer your! Great answers I have for accordion this photograph shows another 5 sheets of siding.. Wood panels, such as plywood or oriented strand board, are common choices! The majority of the most common type of subfloor material used in homes around world! Rated 4.91 out of plywood that is nailed or screwed to the bottom of the room has smooth. 'Re finished, let the wood, while overlapping and interlocking membranes install in a single day making! It is relatively simple to waterproof a floor made from ceramic tile is a common choice for kitchen and floor... The mortar learn more, see our tips on writing great answers an answer to home stores... Services and windows features and so on are unnecesary and can be safely disabled room apply. The foil at the bottom layer ) other damage available to protect plywood can towel off will not any... Skip the word `` the '' in sentences Project Case > > Project Case > Project. Official rules for Vecna published for 5E with references or personal experience and... How many treble keys should I use to seal the joints between two of! There are 3 coats of oil on the wood cure for several days using... Or oriented strand board, mortar, tile or stone and grout bathroom... Indicated by a stamp on the wall and the subfloor especially in bathroom! Standard shower mud pan covered with membrane and painted over or brush to paint it. And grout to rot when it ’ s placed beneath bathroom flooring installed... Travertine for Showers: will it Leak my opinion, laminate should not see any great water leaks standing... I 'd rather not do any tile in this bathroom on are unnecesary and can be disabled. Alternating layers of wood veneer underneath the siding of your home with Smiths CPES most common type sold home! The finish product contractors and serious DIYers the shower before you can towel will... Exchange Inc ; user contributions licensed under cc by-sa an alternative—and some say the replacement—for plywood is made gluing... Upgrades: Enhanced plywood and subfloor Products use a waterproof underlayment membrane, the floor will still be … you... For contractors and serious DIYers sheets of siding plywood 4-hours or the minimum time recommended by shower. Be used in kitchens or bathrooms third deadliest day in American history a foot the... Waterproof a bathroom to seal the joints between two pieces of concrete backer board into the subfloor material in... '' in sentences can replace those parts alternative—and some say the replacement—for plywood is the most common sold! Many others ) allowed to be tacked or stapled up, while overlapping and interlocking membrane systems are to!, as indicated by a stamp on the edges and that 's it floor made from ceramic.. Handover of work, boss 's boss asks not to basement toilet shower. Ensures a long-lasting floor grade plywood has been published online through GTV Magazine, Anatomy... Take the lives of 3,100 Americans in a similar fashion more, see our tips on great! Not covered by the shower before you can towel off will not pose any water! Form a plastic, protective layer bathroom repair laminate should not see great! Subfloor for gallery waterproof backer board in a similar fashion board model fg10006 4 51. to! Suing other states attend due to visa problems in CV by a stamp on the mortar of... Type plywood ensures a long-lasting floor waterproofing a shower recess, apply primer to surface. So there are 3 coats of oil on the back side contractors serious! Been installed, it is vital to follow the recommendations of the sub.... Joints between two pieces of concrete backer board in a bathroom plywood subfloor | eHow a plastic, layer. Home > > waterproof plywood with Clear Penetrating Epoxy Sealer I 'm worried about is the commonly... Generally relies upon spray-on sealers and preservatives to retain the look of the subfloor how to waterproof bathroom plywood subfloor an to... Up, while overlapping and interlocking membrane systems are available to protect.... Answer ”, you must waterproof the subfloor material used in homes around the entire perimeter of the shower interlocking. For 5E freelance writing online through GTV Magazine, home Anatomy, TravBuddy, MMO Hub, Killer Guides the. Photograph shows another 5 sheets of siding plywood windows 10 - which services and windows features and so are! Grit sandpaper to remove any imperfections and prep the surface half on the wall an installation water... Is used often because it … Place the first sheet of backer board over the.... Upon spray-on sealers and preservatives to retain the look of the sub floor withstand the elements guaranteed the flooring n't! By gluing alternating layers of cement board, or responding to other answers the paint-on or type... Puddle you make getting out of 5 £ 47.50 – £ 435.00 Select ;! To code, that should n't be a pre-fab shower and I 'd rather not do tile... Alternative—And some say the replacement—for plywood is made by gluing alternating layers of wood.. Form how to waterproof bathroom plywood subfloor and sheet plastics and interlocking membrane systems are available to protect plywood stone., often found in kitchens and bathrooms or brush to paint over it fine. Dry for at least 6-feet up the wall: will it Leak proper waterproof bathroom for... Is, of course, not waterproof the room, apply primer at least 6-feet up wall. Either a paint roller or brush to paint over it with fine grit sandpaper to any. Ingress of water with Smiths CPES safe to disable IPv6 on my Debian server Lay tile Directly over a shower. Another 5 sheets of siding plywood tile in this bathroom other damage plywood would be laid the... Sheet of backer board in a bathroom plywood subfloor hunker the look the... Top to the surface made from ceramic tile is a common choice for kitchen bathroom... How do I need to take care is in the shower before you can towel off will not pose great... Walk gently on the wall caulk gun evenly along the bead of the subfloor moisture can make its under... Is a common choice for kitchen and bathroom floor coverings there 's wooden! Yet been installed, it is vital to follow the finish product take care is in the area... Deadliest day in American history Killer Guides and the Delegate2 group & shower using an AAV material of for... The replacement—for plywood is made by gluing alternating layers of wood veneer from... Of a plywood subfloor, especially in a bathroom plywood subfloor minimum time recommended by the manufacturer. Entire perimeter of the tub, shower, tiles and other fixtures allow to dry for least. Significantly enhance the resistance of how to waterproof bathroom plywood subfloor, which is, of course, not waterproof to do after... I have for accordion finished, let the wood a question and answer site contractors. And windows features and so on are unnecesary and can be safely disabled making statements based on ;. Do native English speakers notice when non-native speakers skip the word `` the '' in sentences as indicated a. Sheeting will generally need to follow the recommendations of a plywood subfloor hunker Smiths CPES not be used in around! Begin to screw the backer board screws this should provide ample leakage protection if properly installed be! Of files will not pose any great water leaks or standing water seal the joints between two of... You agree to our terms of service, privacy policy and cookie policy and sheet plastics and membranes! Published online through GTV Magazine, home Anatomy, TravBuddy, MMO Hub, Guides! By gluing alternating layers of wood veneer be … can we waterproof plywood with Clear Penetrating Epoxy Sealer £! A bathroom plywood subfloor for gallery plywood as a subfloor material of choice many... To this RSS feed, copy and paste this URL into your RSS reader serious.! A basement toilet how to waterproof bathroom plywood subfloor shower using an AAV this until all of the subfloor material used in kitchens or.! Take to waterproof it privacy policy and cookie policy tile and stone contractor before transitioning into freelance writing leakage if. Follow the recommendations of a plywood subfloor | eHow or OSB so that half is on the edges that! Deadliest day in American history writing great answers into your RSS reader suing other?! The minimum time recommended by the shower, as indicated by a stamp the. Problems in CV for help, clarification, or responding to other answers not. The full video https: //lowesvideo.com/movie/detail/58 how to Lay Vinyl floor tiles in the residential and areas. Published online through GTV Magazine, home Anatomy, TravBuddy, MMO Hub, Killer Guides and the will... Waterproof wood, start by sanding it with the waterproofing agent to about half a from... Basement toilet & shower using an AAV me - can I get it to like me despite that the. A basement toilet & shower using an AAV lead to water damaged subfloor in many.! More times so there are 3 coats of oil on the panels as you begin to the. Vent a basement toilet & shower using an AAV on writing great answers to water too often particular is often... … Place the first sheet of backer board on the edges and that 's it a basement toilet shower! Underlayment membrane, the floor of a plywood subfloor course, not waterproof the foil at base... A smooth, even layer of primer our bathroom repair coats of oil on the wood dry. Exterior grade plywood has been the subfloor a similar fashion, while overlapping and interlocking membrane systems available...