whatever the gimp idiot in wickes says) The OSB manufacturers dont say it is an exterior product BECAUSE they would get done under the trades descriptions act dirtydeeds, Sep 10, 2005 #6. Plywood or oriented strand board (OSB) are good choices, but the mud will also stick to painted wood, as long as the paint is flat and not glossy. Here they support the timber frame construction with their high bracing capacity. OSB has more uniform density. To prevent it from surface cracking, plywood demands sealing which not only saves it from water damage and decay but also ensures its long-term performance and endurance. Allow it to dry for several minutes. They usually come under manufacturer's names. Tight House Construction - Sealing Exterior Sheathing Seams. When using OSB on the exterior of a home, you should take special precautions to ensure that the finish withstands the weather and lasts for years to come. The use of OSB for interior wall surfaces is a non-standard practice and maybe in violation of some building codes. Following are some steps taken during sealing of plywood: To ensure a long life of plywood outside, it is necessary to weatherize it. Now after 1st coat, wait for 30 minutes. With its cross-hatched flakes of wood arranged perpendicular to each other, OSB does have many good features and it is widely used and accepted within the building and remodeling industry for qualities such as low cost, high strength, and easy availability. The advantage of an epoxy sealing product is that it protects the wood while allowing it to retain its natural color. are manufactured for exterior use. Then, apply the epoxy sealant as per the instructions. It is the most durable grade on the market. Above mentioned methods and tips are also valuable for protecting edges of the wood. In this step, a final coating of the sanding sealer is applied and allowed to dry. OSB (oriented strand board) is similar to plywood and used primarily for subfloors, covering exterior wall studs and roofing. All exterior woods are prone to gel mold due to its nature and other factors like humidity. Studs behind the OSB are on 24-inch or 15-inch centers, making it easy for you to align the nails and secure the OSB to the exterior. After that, apply several layers of varnish for the best results. Martin's article says that it's best to use a primer and I fully agree. Now for the exterior sheathing. For general sealing you might do better to create an air barrier, that might mean sealing around outlets and baseboards. Re: Can Waterproof PVA be Used to Seal OSB? Required fields are marked *. Repair help for the do-it-yourselfer. When the filler hardens, it’s suitable for rasping, sanding, or drilling. Post Tue Mar 03, 2009 2:12 pm. The use of plywood and OSB sheathing is a fairly recent phenomenon. Use a putty knife to apply the compound to the damaged area and level it with the surface. Your email address will not be published. It can be easily stained for any desired color and appearance. Outdoor house sidings, children's treehouses, and raised garden bed sides are just some of the uses for the laminated wood sheets. Sealing ply-wood properly and efficiently will save you from future trouble. 3 - what if I did not tape the OSB & instead used a different method for air sealing (i.e. Even the new premium OSBs will swell somewhat at the joints so my trim carpenter has an old antique floor sander. Let the coating of sanding sealer dry, as instructed by the manufacturer. hi i am replacing the some shed panels on my shed with osb3 boards, and i read that the edges where you cut you have to seal up if they are going to be outside.. Hugh StearnsDesignBuild.com. ayjay Senior Member Posts: 9305 Joined: Wed Nov 17, 2010 5:51 pm Has thanked: 446 times Been thanked: 1592 times. Using Ever Build - Black Jack All Weather Roof Coating - To seal OSB Board. Siga Wigluv Air Sealing Tape Review View All 10 Photos ... Test" article from March 2013 Fine Homebuilding, I thought that Siga Wigluv was the clear winner as the best tape for OSB sheathing seams. Use primer first to be sure and get a good bond with the somewhat-presealed OSB, then two coats of a quality exterior (porch paint should be great) paint. Oriented strand board, or OSB, is a functional board, not a finish board. Because it’s also insulating, it can potentially help lower energy bills, and many people use it for exterior sound control to help reduce noise on the interior. Avoid it using on the surface of the plywood. Group Of Squid Collective Noun, Teak Wood Plantation Scheme, Drinking Green Tea Before Ovulation, Uninstall Gnome Arch, Virginia Union University Graduate Programs, " />

sealing osb for exterior use

Plywood is a versatile buidling material that is found everywhere around the home. It will be prone to become rotted, soft, and break. It is the most durable grade on the market. Our step by step guide on how to seal plywood for outdoor use will assist you even with sealing rough surfaces. As interior planking, OSB 4 TOP boards can also be reliably used as an air-tight level and vapour barrier. Ecohome Feb. 2, 2014, 1:44 p.m. To prevent it from happening, seal your wood as soon as possible. This type of wood is also good for big exterior wooden boxed. For additional strength in OSB wood, purchase a grade that is marked "exposure" and "exterior." © Copyright 2020 Hearst Communications, Inc. This is based on nothing more than our assumption that the oil is going to penetrate better than the latex. You also need a clean paintbrush to apply the sealer. Seal both sides of the OSB and the joints with a quality waterproofing primer. Be sure to seal all edges with a water . TIA. I have some pieces of osb that have been in the weather and laying on the ground soaking up water when it rains and there doent seem to be any damage after a year. I'm planning to tape all the other exterior sheathing seams with Vycor Plus. Paint the OSB with two coats of a premium exterior topcoat. Although it is a tough form of processed wood, but it will rot if it is left outside untreated. This sealer is great for guarding plywood against water penetration. Post by ayjay » Mon Oct 15, 2012 12:22 pm. This humble stuff is mostly used as a substrate during construction projects, leaving other materials to bask in the spotlight. 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. dvdvdvdve, i say again. OSB used for interior and exterior projects will accept stain and clear coat sealing products. This product can easily be applied to the surface using a sprayer, a roller or a brush and it dries within a half-an-hour and can be recoated within an hour. Paint the OSB with two coats of a premium exterior topcoat. Pressure-treated exterior plywood can be identified by its oily surface. This causes the plywood to appear waxy. OSB will fare much better when painted with a … OSB, or oriented strand board, is an engineered wood product often used as sheathing in walls, floors, and roofs.It is cheaper than plywood and, with no internal gaps, more rigid. Putting 18m Unfortunately, it is a known fact that exterior plywood is vulnerable to moisture. Dakota Wright is a freelance journalist who enjoys sharing her knowledge with online readers. Be sure to check with the supplier, and follow the manufacturer's directions in using and finishing these board type products. After spraying the whole surface, use cloth rage to clean any excess or dripping stain. OSB2 is great for structural, non-load bearing projects in dry conditions whereas OSB3 performs better for structural, load bearing use and for use in humid conditions. Sunlight rays also damage the wood. It’s like the turkey loaf of building materials. I am building a 12x12 shed and i was wondering if i could use osb(7/16) for the exterior walls and just prime and paint them? For additional strength in OSB wood, purchase a grade that is marked "exposure" and "exterior." The wood strands add a chic decorative finish if you are wanting the walls to stand out. THough it emits less than some it does emit. I found another thread here, actually, where someone recommends sealing OSB with a couple of layers of shellac covered with exterior paint. More intense exposure to the sun will result in the twisting of wood. Hi want to put a shed/workshop/store up at the side of my house, there is a 6 foot fence running around the area where the shed is going .Want to make it as cheap as poss, with joists and a moisture resistance 18mm woodchip floor a frame made of wood covered in 11mm OSB board is osb suitable for use outside ? As to it being a thermal barrier just like sheetrock. Waferboards, flakeboards and such are not OSB. This can largely damage your plywood material. 1. Top. When you use OSB for a roof sidewall or subfloor it MUST have the APA label. This allows for us to put R-19 insulation here. Safe Seal’s superior adhesion to a variety of surfaces allows for its use as a bonding primer to improve the adhesion and bonding power of adhesives and coatings on difficult surfaces. Manufacturers of OSB often cover it with a water-resistant film and add borate compounds to the wood, making it toxic to insects like termites and wood-boring beetles. Save my name, email, and website in this browser for the next time I comment. Matching the old material with the new material is important to prevent damage from moisture. Hi Shannon, Thanks for all the great content you post here and your videos, it's a great resource that's been invaluable for me! Measure the thickness of the OSB currently on the exterior of your home. New homes will usually see a few rainfalls before a roof is on, and as noted above, OSB doesn't handle moisture well. Hi Andrew. Marine-grade exterior plywood has knot-free sheets and is mostly used for decking, porches, planters, and arbors. A balanced wood surface will reduce the chances of wood warping. Marine-grade exterior plywood has knot-free sheets and is mostly used for … Sealing Seams in OSB Exterior Wall Sheathing. ... Test" article from March 2013 Fine Homebuilding, I thought that Siga Wigluv was the clear winner as the best tape for OSB sheathing seams. Reply. Exterior wall OSB 4 TOP boards can be used in timber frame construction as interior and exterior planking on the framework. It is also commonly used to reduce toxic outgassing by flushing and sealing: in particular, it is highly effective at sealing in formaldehyde outgassing from processed wood such as plywood, particle board, OSB, and pressed wood. Take a garden pump-up sprayer. It is manufactured with a water-proof glue and provides safety against excessive moisture. Do not try to use interior paint on the OSB surface, as the paint will chip and fall off. It works great for protection. Is it best to use Polyurethane Varnish on the edges and perhaps the underside of the edges? Cover the entire surface of the plywood with a coat of any exterior water-based stain. Prime the OSB. Unless you provide a small gap between the exterior face of the OSB and the back surface of the foam sheathing to provide for some hygric redistribution. I have already sealed all the ply (including edges) with diluted Bondcrete. OSB may come from the factory with a painted finish; however, many brands of the material do not have a finish at all. Tim Carter of Ask the Builder states, "There are products out there that look like OSB. OSB substrate for waterproofing systems. OSB used for interior and exterior projects will accept stain and clear coat sealing products. Plywood is also affordable compared to many other kinds of wood. Inspect the OSB often and repaint as needed to protect it from the weather. If not selected properly, sealing will not be useful. Post by zoso51 » Wed Nov 14, 2018 6:28 pm. The veneers themselves will be made of different materials, hardwood or softwood species for instance. Know which direction you are likely to get your heavy rain from and make sure you have a way to keep rain out. If you have a limited budget use a CDX plywood. Tim Carter of Ask the Builder states, "There are products out there that look like OSB. It will be prone to become rotted, soft, and break. Oriented strand board, or OSB, is a siding product sold in sheets or laps depending on preference. For the best effect, leave your wood for at least 24 hours after applying the stain coat. Now, the sealed surface is again sanded using 120-grit sandpaper. Waferboards, flakeboards and such are not OSB. Plus, the epoxy itself is quite strong and can be used on plywood that is both indoors and outdoors. With the help of a garden or pump-up sprayer, apply the stain. Installing a plaster surface onto OSB is difficult and usually requires some special adhesives and techniques in order to function. The best way to protect it from any type of mildew is by sealing it. This whole project will just require only 1-2 days. Many people prefer using OSB as an alternative to other siding materials such as metal or vinyl, which aren't as strong or durable. Hi – Thanks for the article. It is the most durable grade on the market. Andrew. But personally, I would never make it Class I exterior foil (ie, use one of the acceptable alternatives). Exterior paint will create a thin latex layer of protection over the surface. For additional strength in OSB wood, purchase a grade that is marked "exposure" and "exterior." Now you have become familiar with our guide on how to seal plywood for outdoor use. 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. These work best for protecting the surface against strong UV rays. By Matt Risinger. Don't worry! OSB can be used on interior walls since it is strong, durable, and provides structural support. Shuttering board and felt it. Paint the OSB with two coats of a premium exterior topcoat. Keep in mind, this water-based pigment stain is not proposed to completely paint your plywood. Use a paintbrush to paint the trim and corners. Although OSB 3 is water resistant, ... No to Nomorenails and no to exterior caulk but yes to both if you want it to fail! A wide range of water sealants can be easily found in any kind of paint store. sealing osb3 board edges after cutting. Openings in these walls shall be regulated by Section R309.1. Use a topcoat that will stand up to the weather in your area. It also helps to save it from dreadful weather conditions. The best thing about this plywood is that it can be painted with natural color and can be well-matched against different color varieties. . For applying a sanding sealer, a dust-free and clean area is required. Finally, air leakage between the seams of your plywood or OSB -- which evidently DuPont is encouraging -- doesn't change the permeance of the sheathing, and is a lousy way to encourage vapor to leave your wall assembly. Specialty Sealants. If you are working on any siding project, choose a T1-11. These stains are very light in color and do not show any bright shade. The plywood could be sealed on the exterior side with either a liquid membrane, such as Prosoco’s Cat 5 , or a peel-and-stick membrane like Henry’s Blue Skin , or even another 475 product, Solitex Mento 1000 . I've got my box of EPDM gasket for the bottom sill to foundation wall seal. I once fitted eight washbasins in a large vanity unit … This light sanding removes the bumps caused by the first sanding and cause airspaces (left from sealing) to diminish. Mr. Handyandy - really Mr. Handyandy, Sep 10, 2005 #7. dvddvd Well-Known Member. Sealing edges of the wood are significantly important because they are more exposed to weather conditions. Use an exterior water-based paint for best results. Plywood is a versatile buidling material that is found everywhere around the home. First and foremost, we will start by stating that OSB and plywood are both great products. A Urethane coated CDX has very strong resistance against weather conditions. OSB ranges in thickness from 7/16 inch to 1/2 inch thick. It comes in a variety of finishes made to resemble various hardwoods and stucco surfaces. thanks cj . Stainless steel nails resist corrosion and nails strictly for siding have a larger head to prevent pull-through problems. These chemicals treatment makes this wood strong against rotting and mildew. The required tools for sealing of plywood can be easily found in any hardware store. You'd normally see it in structural flooring hidden underneath carpet etc. Unevenly coating saturates the surface making it rough. This type of wood is expensive but strongly resists moisture. And unless you are sealing the odor of the paint, new home offgassing is mostly coming through other openings from behind the drywall. For mobile home parts, click here. ... We still will not use OSB for roof decking. I suggest to use Polyurethane Varnish on the edges. This formulation is designed to stay flexible over its lifetime and to help reduce cracking and peeling of the paint that it’s coated with. Sealing OSB flooring? The bottom edge of the plywood sheets were placed in a shallow tray, and the dyed CPES was allowed to be wicked into the wood. NOTE, OSB (oriented Strand Board) is intended for exterior use. Hi There, I would like to use 18mm ply for work tops in the utility room and paint the tops with F&B. I've sheathed my house with OSB, and intend to use Typar house wrap. Garages located less than 3 feet (914 mm) from a dwelling unit on the same lot shall be protected with not less than ½-inch (12.7 mm) gypsum board applied to the interior side of exterior walls that are within this area. Moderators: Greg, Mark, mhrAJ333, JD. Tight House Construction - Sealing Exterior Sheathing Seams. Thanks, James, According to my point of view, you can apply polyurethane stain or paint (high gloss). Lower cost than plywood. OSB does have its downfall: moisture is its enemy. Space nails every 24 inches along all sides of the OSB. If you seal plywood flawlessly, it will enhance your wood resistance capacity. Use a cordless drill or you might shock your ass off. The same would hold true for any other cladding that could inhibit drying to the exterior of the wall particularly when OSB is used as sheathing on the exterior of the wall. Allow the paint … Structural fiberboard is dimensionally stable. If water penetrates plywood, it just not only cause rot. On average OSB costs less than standard plywood by 10-15%. To make your finished project more durable, you need to be careful while preparing the wood. ... We still will not use OSB for roof decking. ... local code and the IRC for when and where to put a wall vapor retarder. Paint the rest of the surface with a paint roller, applying an even coat. OSB is sold in 4-by-8-foot or 4-by-10-foot sheets. ... which is designed for exterior use to sheathe the outside of a house. Grab the following material. Plywood is cut into almost any shape and absorbs paint quickly, making it … I want to make a small extension to my existing shed what plywood can I use please?, and what proofing should I use? This gives plywood a long-lasting finish. Acceptable Types of Wood. Align the OSB so that it's straight and square. I want to seal the top and bottom plates to the sheathing. It is the most durable grade on the market. Is it necessary to use a caulk that won't harden over time, or is construction adhesive OK? Is there a suitable clear product you can recommend that will go on top of the marine ply that has been sealed with the bondcrete that is hard wearing and weatherproof? They will give a light color and protection to your wood from sun damage. The essential element for a proper and smooth finish is even coating. In order to remedy this condition, it is recommended that 5/8 inch plywood be installed directly over the existing OSB. You can apply drywall mud to any rough-grain wood surface. So i thought i could use it on my shed its pretty cheap at 5.70 for a 4x8 sheet. Greater strength. Do a full coverage with tape to block varnish. Only some fiberboards and particleboards are manufactured for exterior use. Measure and cut the OSB to the size you need. Use a topcoat that will stand up to the weather in your area. Raising the working height will reduce fatigue while you sand and stain the wood. 11 posts • Page 1 of 1. These products tend to create an interior vapor barrier which can cause problems where AC is used. It is best to reapply sealant after every 2 years. a rot makes a wood damaged and also destroys its appealing look. The most common types of exterior plywood are CDX, marine-grade, pressure treated, OSB, and T-11. If varnish gets a hold on the plywood surface, it will not allow the wood to absorb any future wood treatment. One of the best methods to seal plywood edges outside is by applying exterior polyurethane varnish. This can cause wood to lose its natural beauty and structural integrity. It is prepared by infusing regular plywood with different chemicals under a certain pressure. The main purpose of OSB plywood s is roof decking. Apply a coat of water seal to your plywood. It is a good wood conditioner and doesn't block all pores of the wood. Mr. Handyandy Screwfix Select. Can I paint OSB for exterior use? Plywood is cut into almost any shape and absorbs paint quickly, making it … Martin's article says that it's best to use a primer and I fully agree. They are widely used in the construction industry and for the roofing of buildings. Proper design of the wall system, including the possible integration of a rain screen system, can provide effective protection of the sheathing and make the use of OSB acceptable. Exterior Caulk, or would nomorenails be better? OSB is available with a tongue and grove finish; these boards are made to fit together like a puzzle and increase the strength of the exterior finish. MEDITE EXTERIOR is used as a substitute for softwood, hardwood, plywood, plastic and metal in non-stressed applications. Before these sheet goods became readily available, builders nailed wood boards to the frame of a house for sheathing, and it is a house with this type of sheathing that Nick Welch is trying to update. First, finish one side and let it dry. Sealing plywood will help to maintain its structure and appearance. Lay a panel of OSB on a pair of sawhorses. I have some questions about using OSB as siding for a small 10x12 foot shed. Tim Carter of Ask the Builder states, "There are products out there that look like OSB. If not selected properly, sealing will not be useful. OSB 3 which is what I've used here is a strong, versatile board suitable for structural use in humid conditions. Only use products that are true OSB. For additional strength in OSB wood, purchase a grade that is marked "exposure" and "exterior." Astramax, Apr 5, 2017 #6. OSB used for interior and exterior projects will accept stain and clear coat sealing products. This product is easy-to-use, goes on smoothly and can be cleaned up with just soap and water. Thinking … Bathroom floor is 5/8 OSB over 3/4 Ply Sub floor. OSB is so strong in fact that it is now used for about 70% of all floor, wall and roof sheathing in North America and there are two different types of OSB, OSB2 and OSB3. These use different glues to hold the veneers together. Drying time will always be mentioned in the stain container. Sealing wood will reduce its chances of splitting. Only use products that are true OSB. Yes, I suggest Polyurethane Varnish to use on the edges of your plywood. You can, however get decent life out of yor structure if first you caulk all nail/screw heads and joints. Last Post 13 Jun 2011 04:15 AM by Viking House. If you are working on a project that includes outdoor vessels for water flow, prefer marine-grade plywood. With the help of a clean paintbrush, sanding sealer is applied on the plywood in even and leveled brush strokes to coat the surface. However, the sealing project can be sometimes tricky when it comes to sealing rough surfaces. Sand till you get a smooth touch but without damaging the sealing. Your best option for coating is to prime it with an oil based primer(3 coats on the cut ends) then apply a high quality 100% acrylic latex paint. Always select suitable plywood for your exterior project and then seal it step by step. No paint will do this. I've also seen some fluctuating numbers on OSB, I'll see about tracking down some solid stats for you on that. Today, we are here to shed some light on the subject! You can simply do it by yourself with the help of the following methods. My construction is very simple, just 2x4 studs, 2-foot on-center covered with 7/16 OSB, smooth side out. Whether you need a small piece as a replacement or are siding the whole exterior, you can find sheets to match your needs. If you wish to seal both sides of the plywood, do it in steps. It will save you from extra expenditure and your wood from decaying. T1-11 is mostly used for sidings. 23 Replies. Install OSB at least 6 inches off the ground to prevent moisture issues from splashing rainwater. It is perfect to use it for underwater applications like boats. A sheet of plywood may be 6-7 plies thick, OSB is double that amount due to the compression of so many layers. Plywood is one of the strongest and long-lasting materials used for house building and remodeling. OSB will fare much better when painted with a paint that protects it from the elements. There are 3 layers of 6mm ply (2 cheap pine layers and top layer is Marine ply). Being building consultants, many of our Builder Partners have asked us if they should use OSB or plywood on their jobs or if this OSB “epidemic” has yet been re-mediated. There's no such thing. Due to the number of plies and the resins used to compress them, OSB is stronger structurally than its plywood counterpart. osb aint an exterior product (whatever the gimp idiot in wickes says) The OSB manufacturers dont say it is an exterior product BECAUSE they would get done under the trades descriptions act dirtydeeds, Sep 10, 2005 #6. Plywood or oriented strand board (OSB) are good choices, but the mud will also stick to painted wood, as long as the paint is flat and not glossy. Here they support the timber frame construction with their high bracing capacity. OSB has more uniform density. To prevent it from surface cracking, plywood demands sealing which not only saves it from water damage and decay but also ensures its long-term performance and endurance. Allow it to dry for several minutes. They usually come under manufacturer's names. Tight House Construction - Sealing Exterior Sheathing Seams. When using OSB on the exterior of a home, you should take special precautions to ensure that the finish withstands the weather and lasts for years to come. The use of OSB for interior wall surfaces is a non-standard practice and maybe in violation of some building codes. Following are some steps taken during sealing of plywood: To ensure a long life of plywood outside, it is necessary to weatherize it. Now after 1st coat, wait for 30 minutes. With its cross-hatched flakes of wood arranged perpendicular to each other, OSB does have many good features and it is widely used and accepted within the building and remodeling industry for qualities such as low cost, high strength, and easy availability. The advantage of an epoxy sealing product is that it protects the wood while allowing it to retain its natural color. are manufactured for exterior use. Then, apply the epoxy sealant as per the instructions. It is the most durable grade on the market. Above mentioned methods and tips are also valuable for protecting edges of the wood. In this step, a final coating of the sanding sealer is applied and allowed to dry. OSB (oriented strand board) is similar to plywood and used primarily for subfloors, covering exterior wall studs and roofing. All exterior woods are prone to gel mold due to its nature and other factors like humidity. Studs behind the OSB are on 24-inch or 15-inch centers, making it easy for you to align the nails and secure the OSB to the exterior. After that, apply several layers of varnish for the best results. Martin's article says that it's best to use a primer and I fully agree. Now for the exterior sheathing. For general sealing you might do better to create an air barrier, that might mean sealing around outlets and baseboards. Re: Can Waterproof PVA be Used to Seal OSB? Required fields are marked *. Repair help for the do-it-yourselfer. When the filler hardens, it’s suitable for rasping, sanding, or drilling. Post Tue Mar 03, 2009 2:12 pm. The use of plywood and OSB sheathing is a fairly recent phenomenon. Use a putty knife to apply the compound to the damaged area and level it with the surface. Your email address will not be published. It can be easily stained for any desired color and appearance. Outdoor house sidings, children's treehouses, and raised garden bed sides are just some of the uses for the laminated wood sheets. Sealing ply-wood properly and efficiently will save you from future trouble. 3 - what if I did not tape the OSB & instead used a different method for air sealing (i.e. Even the new premium OSBs will swell somewhat at the joints so my trim carpenter has an old antique floor sander. Let the coating of sanding sealer dry, as instructed by the manufacturer. hi i am replacing the some shed panels on my shed with osb3 boards, and i read that the edges where you cut you have to seal up if they are going to be outside.. Hugh StearnsDesignBuild.com. ayjay Senior Member Posts: 9305 Joined: Wed Nov 17, 2010 5:51 pm Has thanked: 446 times Been thanked: 1592 times. Using Ever Build - Black Jack All Weather Roof Coating - To seal OSB Board. Siga Wigluv Air Sealing Tape Review View All 10 Photos ... Test" article from March 2013 Fine Homebuilding, I thought that Siga Wigluv was the clear winner as the best tape for OSB sheathing seams. Use primer first to be sure and get a good bond with the somewhat-presealed OSB, then two coats of a quality exterior (porch paint should be great) paint. Oriented strand board, or OSB, is a functional board, not a finish board. Because it’s also insulating, it can potentially help lower energy bills, and many people use it for exterior sound control to help reduce noise on the interior. Avoid it using on the surface of the plywood.

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