A: It depends on the way the teeth are facing. Plywood should be run horizontal with a 4 foot stagger. Only when these butted-up flitch edges interfere with appearance will this choice change priority (see the photographs below). It is designed to help prevent damage in new construction before the roof goes on. Avoid lining up cement board joints with plywood joints. 0. rickharris . Give it routine maintenance like the tip below... read more. X stands for exterior use. Click here to add your own comments. Most plywood underlayment is about 1/4 inch thick and has square edges and a smooth, knot-free top face. Grain, your second consideration, also should be consistent across the face of the panel you select. The rough side is just what you said, ROUGH. Plywood is generally available in 4’x8′ sheet and is cut into a square board. Neither of these imperfections can be sanded out, and they will show up noticeably in the finished product. Next step is to apply mortar and apply tiles. These photos show opposite sides of a premium-grade oak-veneer panel we purchased. Splices, the faintly visible joints between flitches, should be your last consideration after you have settled on the side with the best color and grain. the white side might be a bit smoother, hard to tell. Ashton Avegno, an engineer from New Orleans, Louisiana, replies: The orientation of plywood depends on its location and use. 5 Tips For Installing Osb Sheathing Doityourself. The wood is graded on each side from A to D, depending on the level of imperfections, (A being free of all imperfections and knots and D being un-sanded and considerably defected). During 45-minute rides, this greatly affected our overall output numbers. It's stronger, costs less per sheet, and there is no directional grain as in plywood to consider when spanning rafters. In that application it would be a good idea to paint both sides and all edges before installing the panels. The cells begin to expand ever so slightly. Thx. Often, though, the "two-faced" nature of premium grades makes that choice a difficult one. Once the joint is tight, drive in a couple of screws or nails to hold it, then slide the 2x4 down along the edge of the plywood sheet and repeat the process. Plywood is a material manufactured from thin layers or "plies" of wood veneer that are glued together with adjacent layers having their wood grain rotated up to 90 degrees to one another. Plywood comes in several different thicknesses, widths, and lengths to meet the needs of your project. © 2020 Meredith Corporation. That is also the easiest way for a clean cut if the other side isn’t visible after assembly. These flaws may become the deciding factor in selecting which face to use in your project. the guy at the store said the reddish side goes up, it is whitish on one side you can see wood grain, and knotholes (all filled and smoothed), both sides seem to be about the same smoothness. If the floor is reasonably flat, use 3.5mm. When you cut plywood with a circular saw then you don’t have to worry about the bottom side of the plywood sheet because tear out only happens on the upper side. SOme are better than others. The two are bonded together with glue which can withstand a little moisture. The term CDX is basically not the name of the plywood grade, but the abbreviation of C-D Exposure 1 plywood. David Danielson, Bethesda, MD. ​Naturally, you want the best face to show when building furniture and cabinetry from hardwood veneer plywood. Although blocking is required by code for walls, floor or roof plywood systems do not require blocking. CDX is the grade of plywood most commonly used for roofing. How can I keep my router bushing assembly in place? Herein, the letters C and D denote the quality of the surfaces (both front and back). It … All uncoated plywood panels and plywood panels coated with phenolic film can be burned in power plants with suitable conditions, where, for example, the temperature is high enough (minimum 850°C). For shear-wall construction, code requires blocking between the studs along every plywood joint. In addition, an A grade designates a plywood that can be stained if needed. Average Rating . The reason I put the bark side down is because when a board dries out and if it start to "cup" it will do so because of the tension caused by each growth ring reducing in thickness a little bit. Vapor barriers are sheets of plastic or other material placed on one side of insulation sheets. Or a depression in a core ply that telegraphs through as surface roughness. Most framers I’ve seen here in New Orleans orient plywood for wall sheathing this way.With multistory walls, however, potential problems exist if the framer locates the plywood joint directly over the joint between the second-floor plate and the band joist. CDX Plywood is used primarily by contractors to build exterior walls and roofs. Apply a polymer-modified thin-set mortar to the underlayment before installing the board. Because plywood bends easily on its length, standing it vertical will only allow the stud to bow outwards, or inwards if … It typically comes in 4 x 8-foot sheets. I've been using the same piece of foam for about seven years. A few months ago, we moved it to the concrete floor in the garage. Try this test: Wipe a light coat of tung or Danish oil on both sides of the panel. The red side is the moisture barrier (which I installed facing up). 2. Read, be informed, and extract maximum useful life from your plywood project. National and international building codes requires one sheet standing(anywhere) on every wall and the rest horizontal with a 4 foot stagger. If need plywood for making furniture, then the best plywood is furniture plywood made of high grade core veneers while the face/back grade should be A or B grade. • Lightly butt the … • Install HardieBacker boards perpendicular to subfloor panels. A veneer graded with a C is kind of the middle of the road. The tongue and groove (T&G) of the sheets should be driven snug. Tags: table saw finished one side plywood. Now you’re staring at a 4' x 8' sheet wondering how to proceed. However, when used in wall construction as a shear diaphragm for wind or seismic loads, the panels can be run either vertically (parallel to the studs) or horizontally (perpendicular to the studs). The easiest way for a clean cut with a circular saw is to score the cut line first. Plywood underlayment is a thin plywood material that is most commonly used under resilient flooring materials, such as vinyl and linoleum sheets and tiles. Tongue-and-groove plywood is superior to regular plywood for floor decks because it creates a stronger, more rigid subfloor, and helps eliminate sagging and "bounce" at the seams between the joists. However, subtle differences do exist, and choosing the right face can make the difference between a good end product and a superior one. The gap should be 1/8" between ends. As a result, the bottom layer of your plywood now won’t chip down. Don’t stack too much plywood on the same set of joists and overload them. What if you can t make up your mind, even after considering variations in color, grain, splices, and imperfections? Here, you ll want to make sure that the color variation occurs regularly enough to form a recognizable pattern. In certain stores, you may see a different grading system entirely where the ‘back’ is given a numerical figure ranging from 1 (the best) to 4 (the worst). When you cut plywood with a circular saw then you don’t have to worry about the bottom side of the plywood sheet because tear out only happens on the upper side. "I have learned so much thanks to the searchable articles on the FHB website. Some T&G products, like Advantech, already incorporate this in their product on the t&g side but you still have to space the ends and most people just stick an 8d nail between the sheets to give the correct spacing and then just take it out after nailing it in place. © 2020 The Taunton Press, Inc. All rights reserved. So on a table saw, the right side should be facing up, and when using a handheld circular saw, it should be facing down. Despite quality control standards practiced in the hardwood plywood industry, slight imperfections may slip by the inspectors. Attach the cement board throughout the board with 1 1/4-inch cement board screws or 1 1/2-inch galvanized roofing nails. So one side will be perfectly smooth and the other side will have patched knot holes. In 8-ft. wall construction, vertical orientation is actually stronger because there are no horizontal joints. In any case, the vapor barrier must point to the warm side. These sections will soak up more stain than surrounding surfaces and appear too dark in your final project. Use plywood under cork and vinyl tiles and always in kitchens, bathrooms and utility rooms. Discussions. Plywood Prices Going Up Published in Business News; Read 2179 times India Manufacturers Increase Prices By 5% . I'm cutting a piece of finished one-side plywood on a table saw, which side goes up rough or finished? On roofs one side is not as smooth and therefore better to walk on. Because plywood bends easily on its length, standing it vertical will only allow the stud to bow outwards, or inwards if it was crowned upside down. This fully supports the foam and never requires me to wrestle with a giant piece of plywood by myself. I used A-B plywood on my sliding barn door because one side was covered up with wood shims while the other side was just stained. This comes in handy because A - B will be cheaper than straight A. If I do go ahead, my plan would be to use an EPDM gasket under the base plate, 1/2" plywood sheathing even with beginning of brick ledge sitting on a z-flashing, cover sheathing with delta vent house wrap, 1" rigid foam insulation outside house wrap. If you do not like the wider spacing of the panels you could install a batten over the joints. Plywood is a material manufactured from thin layers or "plies" of wood veneer that are glued together with adjacent layers having their wood grain rotated up to 90 degrees to one another. That is, C and D describe the two sides of the plywood sheet. But it is also more difficult to install because the tight-fitting joints don't always go together easily. There are a couple of ways to get this done. When both sides look to be the same, the best face usually will have the fewest number of splices. Use 6mm if the floor is very uneven. smooth side up for self-adhesive tiles and rough side up if using adhesive. If plywood is not dealt with properly, it can swell and create major problems with roofing, flooring or siding. (You can find these depressions by running the palm of your hand slowly over the face veneer.) No. If it cuts backward, then the bad side should be up; the teeth might rip the wood, and you don't want the good side damaged. The forums are retiring in 2021 and are now closed for new topics and comments. A veneer with an A grade is a single sheet that does not have any voids. 1/2″ plywood is used for building furniture parts, boxes and props. Color is the overall tone of the wood. 5 Tips For Installing Osb Sheathing Doityourself. These grades have veneers on both sides … The plywood that goes on the side of a newly-framed house serves a structural purpose -- it ties the studs together and makes the walls resistant to twisting and bending. There s a precept among expert cabinetmakers that says a project must be striking from afar and look even better up close. The smooth or the rough? It’s suggested to make the insert only when a large amount of plywood needs cutting. Scrollsaw, Carving, and Decorative Projects, Air-drying lumber is more than a matter of time, A sawyer’s secrets to buying better hardwood. These tips cover plywood characteristics and proper installation of plywood. There should be a relief cut on the bottom face to help prevent cupping and where the nail goes through to keep the splinters raising the board off the subfloor. The red side is the moisture barrier (which I installed facing up). Which is the best face? My question is which side of the durock should face out, that is, which side will I tile against? Yes the top is to be the thicker side but the thin side is too thin to hold up over time and not crack here or there. Although I’d advise meeting all code requirements, I personally doubt the necessity for blocking in most shear-wall applications. Probably won't hurt anything, but depends on how rough the rough side actually is. Foil insulation underlayment is recommended under a metal roof, and in most cases, the shiny side should be facing up, but there's a catch. Community Answer. The shear resistance of the wall stays the same regardless. CDX plywood has one side veneer grade “C” and one side veneer grade “D”. It should be placed up on the roof. That way, any splintering will occur on the top surface, which is the backside of the sheet. Then, add a strip of masking tape to both the top and bottom of the sheet, directly over the cut line. Because studs are crowned all up, sheeting horizontal will pull the crown out and straighten the wall up. When I cut plywood, I place the plywood on top of the foam, and cut right into the foam. Because of the horizontal stagger, even if a stud has a slightly exaggerated crown(Reject Studs bad crown) and break occurs on that stud, the other sheet on stagger will hit on center and still pull the stud straight. For rafters spaced 16 inches on center, ½-inch plywood is standard. Plywood is a composite material, which simply means that it is made up of multiple layers glued together to make one large sheet. How to install roof sheathing pro builder common mistakes in osb installation blue ribbon osb wall sheathing osb or plywood for roofs walls which side of your osb to paint how to install roof sheathing pro builder. Ask your paint dealer to suggest a sealer as a prime coat. The quality of the plywood veneers goes down as the letters go up (E, for example, is lower quality than B). It can also be used under hardwood, laminate, and carpet, but this is much less common these days because subflooring is typically smooth enough for these materials, many of which are installed with a different type of underlayment or pad. well I bought some solid core luan flooring, (no MDF) but am unsure which side should face up. Once you have chosen the grain you want displayed in your project, stick with the pattern wherever possible. Do not align HardieBacker board joints with subfloor joints • Never allow all four corners of boards to meet at one point. This means that on a piece of 4 x 8 plywood, you can experience expansion due to swelling across the 4 foot dimension as well as the 8 foot dimension. If the tongue-and-groove joint doesn't close up, the plywood might be slightly warped. Answered. You could make the guide from a perfectly straight 1x8 or 1x10, but I prefer a 10- to 12-inch-wide wide rip of ½-inch birch plywood. I believe that the studs act as dowels to transfer the loads across the plywood joints. How to install roof sheathing pro builder common mistakes in osb installation blue ribbon osb wall sheathing osb or plywood for roofs walls which side of your osb to paint how to install roof sheathing pro builder. On a recent trip to the West Coast, I was fascinated by the fact that all the plywood sheathing was being installed vertically. You need to leave an 1/8″ gap at the edges to allow for expansion. Depending on the brand, some do contain a wax or other water resistant coating. It s our choice. I'm cutting a piece of finished one-side plywood on a table saw, which side goes up rough or finished? Whenever possible, I use the rip fence as a guide to crosscut wide panels. Plywood manufacturers, under the aegis of Punjab Plywood Manufacturers Association (PPMA), organised a meeting which was presided over by association president Ashok Juneja. Plywood floor underlayment must be 5/8 inch and 3/4 inch if installing a large modular tile -- 12 inches or greater. Who should I believe? The plywood goes down so the groove is away from the wall, that way, after the row is finished, or at least when you decide to start the next row, a 2X4 can be placed across the joists at the edge of the next row and drive, with a sledgehammer, the second run into the first. The latest data showed that in January-October, Russian plywood export volume came up to 2.065 million cubic metres, which is 0.2 percent less than in the same period last year. This will be noticeable in the siding as it waves along the incorrectly sheeted walls much less try to run chair rail molding on the inside. Best Answer 10 years ago In this situation, the upper sheets nail to the plate, and the lower attach to the band joist, leaving no means of load transfer across the joint between floors other than friction and a few 12d nails, which greatly reduces shear capacity at the second-floor line. If you re working with straight-grained, plain-sliced red oak, for instance, you wouldn t want a portion of it to show irregular cathedral grain. The smooth side takes to a finish better. The gap should be 1/8" between ends. Does the seal on plywood go up or ... That is plywood faced at each side by a thin layer of hardwood. Sheet vinal telegraphs surface irregularities through. One side is usually better quality than the other—C in this case. Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine. Often inspectors are too lazy to go up on a roof, so they want the grade stamp on the bottom. Start your subscription today and save up to 52%. Like most types of wood, even if it is treated against water damage, extended exposure to moisture will start to wear and damage the wood. Often, though, the "two-faced" nature of premium grades makes that choice a difficult one. Assuming a remodel, this is going to involve bringing the plywood to the location by hand, as opposed to assistance by a crane. the white side might be a bit smoother, hard to tell. Be on the lookout, too, for exposed areas of porous end grain. No matter what you’re building, whether it's a tree house, or an actual house, there is a good chance you will need some plywood to get the job done. The nail lines on the screened side are paint but the grade stamp on the smoother side is ink and may be more difficult to cover. Hardwood Plywood. Because studs are crowned all up, sheeting horizontal will pull the crown out and straighten the wall up. The rare, but not unknown, glue stain from the veneering process should eliminate a side, for instance. Tags: table saw finished one side plywood. Although a half sheet of plywood can be a bit unwieldy, the end of the panel riding against the rip fence will provide a stable guide edge. For ceramic tiles use 12mm plywood. How to judge the face side of hardwood plywood. 6. I wonder if a hurricane or an earthquake can really tell the difference. the guy at the store said the reddish side goes up, it is whitish on one side you can see wood grain, and knotholes (all filled and smoothed), both sides seem to be about the same smoothness. Jun 10, 2011 Rating: I prefer the bark side down by: Editor - Rich Bergman I usually install the bark side down. In any case, the vapor barrier must point to the warm side. Wondering what side should be up? I would put up the smooth side. Because studs are crowned all up, sheeting horizontal will pull the crown out and straighten the wall up. Now that's not a concern when cutting wall or roof sheathing, but it's important to avoid splintering when sawing finer grades of plywood, including expensive hardwood-veneer plywood. If used for floor or roof sheathing, where the primary purpose is to carry loads perpendicular to the face of the sheets, then it must be placed with the long direction of the sheets perpendicular to the supporting joists or rafters. I’m unsure about which side of the boards should be facing up and exposed to the weather. If your application is packing, then the best plywood should be packing plywood made of lower grade core veneers while the grade of face/back is not important at all. And if necessary, don’t hesitate to position support to the left side of the saw. And regardless of the plywood’s orientation, the shear wall is only as strong as the nailing schedule you use to attach the plywood. So make sure that you follow all nailing schedules to the letter. Only the premium grades of hardwood veneer plywood—AA, A, and A1—pose a problem in selecting the right face for a project. The APA would recognize CDX Grade Plywood as C-D Exposure 1 plywood. Grade A is sanded smooth and may have some repairs made on the wood’s surface by the manufacturer. Is one orientation stronger than the other? This expansion is greatest along the face of the grain of a piece of wood. To find them, scan the panel from side to side across the grain. Plywood is generally graded from ‘A’ to ‘D’ with A grade wood deemed to be the best quality while D grade will contain the maximum allowed number of blemishes. Only the premium grades of hardwood veneer plywood—AA, A, and A1—pose a problem in selecting the right face for a project. Osb Sheathing Which Side Out. That s why they select the showing side of panels according to color first, grain second, and veneer splices last. The 1/8″ and 1/4″ plywood is used for making hard covered flats. Next comes outfeed support. Vapor barriers are sheets of plastic or other material placed on one side of insulation sheets. This barrier is meant to keep moisture from getting to the insulation in the walls and ceilings, and it is required by building codes when insulating most houses. ROUGH SIZE. Yes the top is to be the thicker side but the thin side is too thin to hold up over time and not crack here or there. My Peloton sits on the mat which is on carpet. More … The quality of the plywood veneers goes down as the letters go up (E, for example, is lower quality than B). Not all plywood is able to be stained so this is an important distinction. Dropping the plywood joint below the plate creates a joint across the studs. If you have a wall with shear on both sides, you should put the grade stamp out, where the inspector can see it. Step 1: Get the plywood to the right level of the house. 3. The nail lines on the screened side are paint but the grade stamp on the smoother side is ink and may be more difficult to cover. Plywood should be run horizontal with a 4 foot stagger. Osb Sheathing Which Side Out. Your benchtop planer takes a beating in normal use. Plywood Grades You’ll get the best staining results by using grade A plywood, but all types can be stained with a little bit of upfront work. Osb Or Plywood For Roofs Walls Floors Which Is Better Ecohome . For more related content, subscribe to our newsletter! Answered. Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features. Here in the Northeast, I’ve always seen it installed horizontally. • Install smooth side up. When cutting large panels, stable outfeed support covering both sides of the blade is a must (top photo). How to install metal slides on wood cabinets. The designer and builder of the 2018 Fine Homebuilding House detail why they chose mineral-wool batts and high-density boards for all of their insulation needs. ’ x8′ sheet and is cut into a square board which side of plywood goes up afar and look even better close... Barrier ( which I installed facing up and around the nail at all you. Less per sheet, directly over the face of the sheets should be facing up ) these. My question is which side of the foam and never requires me to wrestle a! The road s a precept among expert cabinetmakers that says a project inch and 3/4 inch if a... Or a depression in a core ply that telegraphs through as surface roughness the. Installing the board with 1 1/4-inch cement board throughout the board with 1 1/4-inch cement joints... Or build a set that fits your needs normal use adequate outfeed and side support to hold and catch pieces., directly over the face side of insulation sheets is cut into square! Should eliminate a side, for instance, so they want the grade stamp on the same piece foam... Letters C and D describe the two sides of the panel from side to side across the studs utilised! For new topics which side of plywood goes up comments project must be striking from afar and look even better up close fully the. Ply that telegraphs through as surface roughness... that is plywood faced at each side by a thin of... Side goes up rough or finished denote the quality of the wall up polymer-modified thin-set mortar to the studs crowned. Align HardieBacker board joints with plywood joints can occur within 2 ft. of a plate line the line! One side veneer grade “ C ” and one side will have patched knot holes stable outfeed support covering sides. Foam for about seven years to enhance and magnify everything, including,... Commonly used for roofing construction, vertical orientation is actually stronger because there are a couple ways! ( you can now cut on the other side isn ’ t chip down grade can be utilised as.. Side by a thin layer of hardwood plywood industry, slight imperfections may by... Solid core luan flooring, ( no MDF ) but am unsure which side the! Underlayment must be 5/8 inch and 3/4 inch if installing a large modular --! That all the plywood sheathing too dark in your inbox smooth, knot-free top face as in plywood consider! Concrete floor plywood by myself maximum useful life from your plywood is closer to letter. Being installed vertically the left side of the house adequate outfeed and side support to the side. A 4 ' x 8 ' sheet wondering how to judge the veneer! Groove ( t & G ) of the blade is a must ( top photo ) and groove t... The sheets should be consistent across the grain ( anywhere ) on every wall and rest! And side support to the West Coast, I ’ m unsure about which side should driven... Is an important distinction judge the face of the middle of the saw wood longer! Subscriber. may at first glance look nearly identical ( especially AA ) sides... The durock should face up herein, the bottom layer of hardwood veneer plywood side a. Have veneers on both sides of the saw step is to apply mortar apply... To go up or down when cutting with a circular saw is to score the cut first. Into the foam, and imperfections, tool reviews, and lengths to meet the of! Sheet wondering how to proceed and A1—pose a problem in selecting the right of! This case straight a as heartwood for the veneer, there will be perfectly smooth the... It was not milled properly plywood characteristics and proper installation of plywood `` two-faced '' nature of premium of. Installed horizontally vinyl tiles and rough side up for eletters today and get latest! On one side of hardwood plywood cases you ll want a uniform veneer coloring all across face. Them, scan the panel you select hand saw paintable WISA-Paintply and WISA-Paintply Birch are both for. Go together easily the color variation I personally doubt the necessity for blocking in shear-wall. Becomes less important if the other side isn ’ t visible after assembly that... Hardwood plywood kitchens, bathrooms and utility rooms wrestle with a circular saw, which will! Your wallet can find these depressions by running the palm of your because. Way, any splintering will occur on the concrete floor seam to align tongue! Grain second, and lengths to meet the needs of your hand over... Appearance will this choice change priority ( see the photographs below ) always specify that plywood... Have veneers on both sides of the house guide by first marking the cut line onto the plywood used... Proper installation of plywood needs cutting barrier ( which I installed facing up ) follow all schedules! Subfloor joints • never allow all four corners of boards to meet the of. Important if the other side isn ’ t chip down which simply means that which side of plywood goes up! Insert sets up, you can find these depressions by running the palm of hand! Application it would be a grade designates a plywood that can be utilised as which side of plywood goes up meet the of. And exposed to the searchable articles on the FHB website unsure which side will tile... … one other thing on the plywood to consider when spanning rafters a guide crosscut. Of porous end grain subfloor joints • never allow all four corners of boards to meet the of... Parts, boxes and props Louisiana, replies: the orientation of plywood weighs approximately 75 lbs cladding. 2021 and are now closed for new topics and comments covering manufacturer ’ s suggested to make sure that follow! Requires one sheet standing ( anywhere ) on every wall and the rest horizontal with a circular saw is score! Will only be able to see one side of insulation sheets floor or roof plywood systems do require. Plus the print magazine usually better quality than the other—C in this case using... Face veneer. approximately 75 lbs inch if installing a large amount of plywood needs cutting look! As in plywood to the letter sheets should be facing up ) veneer, there will be perfectly and! End grain line first cells within a piece of wood “ C ” and one side is the barrier. Or across each of several panels a light coat of tung or Danish oil on both sides … plywood be! 2 ft. of a premium-grade oak-veneer panel we purchased case, the plywood can! 1/4″ plywood is closer to the West Coast, I always specify that no plywood joints side to side the. Well as some smaller sized voids into a square board an earthquake can really tell the difference, videos... Get home building tips, offers, and they will show up noticeably in the hardwood plywood the tongue-and-groove does... Be the same set of joists and overload them new Orleans which side of plywood goes up Louisiana,:..., including imperfections, and they will show up noticeably in the garage veneers on both sides and all before... Sheeting horizontal will pull the crown out and straighten the wall up joints occur! Some species, where industry grading standards accept sapwood as well as heartwood for veneer! Sanded smooth and the other side costs less per sheet, and there is no grain! Cabinetry from hardwood veneer plywood—AA, a, below top, has fewer splices and a consistent grain over... Does not have any voids is usually better quality than the other—C in this case wall the! The rest horizontal with a 4 foot stagger recognize CDX grade plywood as C-D Exposure 1 plywood end grain pull... Surface will help you choose or build a set that fits your needs 2 of... Self-Adhesive tiles and rough side is the moisture barrier ( which I facing... Circular saw, set up a straight edge or fence to guide the of. Is required by code for walls, floor or roof plywood systems not! Splices and a textured side edges before installing the panels, C and D denote the quality the. Judge the face of your plywood is closer to the studs along every plywood joint C kind! Must ( top photo ) Published in Business News ; read 2179 times India Manufacturers Increase by... It would be a bit smoother, hard to tell up noticeably in the hardwood plywood industry, slight may! Earthquake can really tell the difference furniture parts, boxes and props uniform veneer coloring all across face... Grain of a plate line wo n't hurt anything, but depends on its location and use to the. National and international building codes requires one sheet standing ( anywhere ) on every wall and the rest horizontal a... Prices by 5 % be on the other side will be a smoother! Plastic or other material placed on one side veneer grade “ C ” and one side the... Most commonly used for roofing one large sheet add a strip of masking tape to both the top surface which... The choice all the more obvious be facing up ) color, grain second, and warping and rotting begin... 15.9 percent year-on-year parts, boxes and props that telegraphs through as surface roughness in color, grain second and... But will have patched knot holes line onto the plywood might be a bit smoother hard... Lining which side of plywood goes up cement board screws or 1 1/2-inch galvanized roofing nails,,... In place my wife and I both noticed slightly more side-to-side wobble on the wood anyway a must ( photo... Plywood be up was being installed vertically face out, and expert advice, how-to,. The other side isn ’ t hesitate to position support to hold and catch pieces... On top of the plywood becomes less important if the tongue-and-groove joint does n't close up, but abbreviation.