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. • Lightly butt the … A veneer with an A grade is a single sheet that does not have any voids. If you have a wall with shear on both sides, you should put the grade stamp out, where the inspector can see it. In addition, an A grade designates a plywood that can be stained if needed. Which is the best face? Plywood is generally available in 4’x8′ sheet and is cut into a square board. Plywood has a good fuel value and can be utilised as energy. CDX Plywood is used primarily by contractors to build exterior walls and roofs. Who should I believe? Be on the lookout, too, for exposed areas of porous end grain. Often inspectors are too lazy to go up on a roof, so they want the grade stamp on the bottom. I believe that the studs act as dowels to transfer the loads across the plywood joints. This comes in handy because A - B will be cheaper than straight A. Despite quality control standards practiced in the hardwood plywood industry, slight imperfections may slip by the inspectors. A: If the floor is reasonably flat, use 3.5mm. 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. There s a precept among expert cabinetmakers that says a project must be striking from afar and look even better up close. Start your subscription today and save up to 52%. And regardless of the plywood’s orientation, the shear wall is only as strong as the nailing schedule you use to attach the plywood. As a quick primer in plywood, each side is rated from A to D. A is smooth and knot-free while D, the lowest quality, has missing knots and cracks. As a result, the bottom layer of your plywood now won’t chip down. The rough side is just what you said, ROUGH. However, subtle differences do exist, and choosing the right face can make the difference between a good end product and a superior one. My question is which side of the durock should face out, that is, which side will I tile against? Only when these butted-up flitch edges interfere with appearance will this choice change priority (see the photographs below). the white side might be a bit smoother, hard to tell. This grade can be constructed using several sheets, but will have visible patches as well as some smaller sized voids. I'm cutting a piece of finished one-side plywood on a table saw, which side goes up rough or finished? That is also the easiest way for a clean cut if the other side isn’t visible after assembly. After three rides, my wife and I both noticed slightly more side-to-side wobble on the concrete floor. Average Rating . In 8-ft. wall construction, vertical orientation is actually stronger because there are no horizontal joints. 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. In some species, where industry grading standards accept sapwood as well as heartwood for the veneer, there will be a color variation. Some sheets are so thin that they’re flexible enough to bend over structures to form a uniform shape, while others are incredibly thick, made to withstand things like weight and wind. It s our choice. • Install smooth side up. © 2020 Meredith Corporation. 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. Bear in mind that both sides of the plywood will be graded so if you see a sheet of A-C plywood, it means the ‘face’ of the wood is excellent whereas the ‘back’ is of lower quality. It depends on the way the teeth are facing. 5 Tips For Installing Osb Sheathing Doityourself. 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. Correction to this wood product problem can clean your wallet. Avoid lining up cement board joints with plywood joints. I would put up the smooth side. You need to leave an 1/8″ gap at the edges to allow for expansion. Set up the straightedge guide by first marking the cut line onto the plywood. Next step is to apply mortar and apply tiles. CDX plywood has one side veneer grade “C” and one side veneer grade “D”. It is designed to help prevent damage in new construction before the roof goes on. 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). The forums are retiring in 2021 and are now closed for new topics and comments. 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. More … Sheet vinal telegraphs surface irregularities through. One other thing on the plywood sheathing. ROUGH SIZE. I wonder if a hurricane or an earthquake can really tell the difference. 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. Sheets can be very long, but you can usually ask a hardware store or Next comes outfeed support. 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. 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. Then, add a strip of masking tape to both the top and bottom of the sheet, directly over the cut line. I've been using the same piece of foam for about seven years. The 1/8″ and 1/4″ plywood is used for making hard covered flats. The easiest way for a clean cut with a circular saw is to score the cut line first. 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. 0. rickharris . Plywood is a composite material, which simply means that it is made up of multiple layers glued together to make one large sheet. The smooth side takes to a finish better. 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. For shear-wall construction, code requires blocking between the studs along every plywood joint. Blocking also becomes less important if the joints perpendicular to the studs are staggered. The thickness of plywood normally used is 1/8″, 1/4″, 1/2″, and 3/4″. Best Answer 10 years ago A veneer graded with a C is kind of the middle of the road. If any moisture comes up and around the nail at all, you need to let the wood dry longer. It typically comes in 4 x 8-foot sheets. Here, you ll want to make sure that the color variation occurs regularly enough to form a recognizable pattern. Use 6mm if the floor is very uneven. These flaws may become the deciding factor in selecting which face to use in your project. 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. The rare, but not unknown, glue stain from the veneering process should eliminate a side, for instance. To find them, scan the panel from side to side across the grain. One side is usually better quality than the other—C in this case. The gap should be 1/8" between ends. 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. If the tongue-and-groove joint doesn't close up, the plywood might be slightly warped. These photos show opposite sides of a premium-grade oak-veneer panel we purchased. Because studs are crowned all up, sheeting horizontal will pull the crown out and straighten the wall up. Plywood should be run horizontal with a 4 foot stagger. Although I’d advise meeting all code requirements, I personally doubt the necessity for blocking in most shear-wall applications. In any case, the vapor barrier must point to the warm side. Osb Sheathing Which Side Out. "I have learned so much thanks to the searchable articles on the FHB website. On roofs one side is not as smooth and therefore better to walk on. Here s what you need to know. So on a table saw, the right side should be facing up, and when using a handheld circular saw, it should be facing down. 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. I’m unsure about which side of the boards should be facing up and exposed to the weather. 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. If it cuts forward, then the good side should be up. When cutting large panels, stable outfeed support covering both sides of the blade is a must (top photo). It is thick side up, but to use that for flooring it was not milled properly. Comments for Pressure Treated Deck Boards - what side up. Osb Sheathing Which Side Out. (You can find these depressions by running the palm of your hand slowly over the face veneer.) 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. You’ll need adequate outfeed and side support to hold and catch both pieces. I'm cutting a piece of finished one-side plywood on a table saw, which side goes up rough or finished? Side A, below top, has fewer splices and a consistent grain pattern over its entire surface. That s why they select the showing side of panels according to color first, grain second, and veneer splices last. Ashton Avegno, an engineer from New Orleans, Louisiana, replies: The orientation of plywood depends on its location and use. Pressure Treated Deck Boards - what side up. Plywood should be run horizontal with a 4 foot stagger. 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. Dropping the plywood joint below the plate creates a joint across the studs. That is also the easiest way for a clean cut if the other side isn’t visible after assembly. Not all plywood is able to be stained so this is an important distinction. 2. 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. X stands for exterior use. The cells begin to expand ever so slightly. It’s suggested to make the insert only when a large amount of plywood needs cutting. Most plywood underlayment is about 1/4 inch thick and has square edges and a smooth, knot-free top face. The red side is the moisture barrier (which I installed facing up). If you use stain, stain both sides. Read, be informed, and extract maximum useful life from your plywood project. Only the premium grades of hardwood veneer plywood—AA, A, and A1—pose a problem in selecting the right face for a project. Although blocking is required by code for walls, floor or roof plywood systems do not require blocking. Also, whenever you use a circular saw, set up a straight edge or fence to guide the foot of the saw. It's stronger, costs less per sheet, and there is no directional grain as in plywood to consider when spanning rafters. Probably won't hurt anything, but depends on how rough the rough side actually is. If you do this, the shiny side of the insulation still goes up, and the rafters automatically create an air space between the insulation and the roofing. Depending on the brand, some do contain a wax or other water resistant coating. Here in the Northeast, I’ve always seen it installed horizontally. Because plywood bends easily on its length, standing it vertical will only allow the stud to bow outwards, or inwards if … The factory edge of the plywood is always smooth and perfectly straight, making it an ideal saw guide. It should be placed up on the roof. Tags: table saw finished one side plywood. As the insert sets up, you can now cut on the insert. 0. rickharris. 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). 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. Because of the horizontal … The easiest way for a clean cut with a circular saw is to score the cut line first. 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. Plywood floor underlayment must be 5/8 inch and 3/4 inch if installing a large modular tile -- 12 inches or greater. In that application it would be a good idea to paint both sides and all edges before installing the panels. © 2020 The Taunton Press, Inc. All rights reserved. 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. A 3/4 inch sheet of plywood weighs approximately 75 lbs. So one side will be perfectly smooth and the other side will have patched knot holes. Going to put down the deck boards. For rafters spaced 16 inches on center, ½-inch plywood is standard. The quality of the plywood veneers goes down as the letters go up (E, for example, is lower quality than B). Apply a polymer-modified thin-set mortar to the underlayment before installing the board. 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). My Peloton sits on the mat which is on carpet. This expansion is greatest along the face of the grain of a piece of wood. Hi there, I'm redoing my shower and have plywood on the studs with poly over top and am putting Durock on top of this. Don’t stack too much plywood on the same set of joists and overload them. • Install HardieBacker boards perpendicular to subfloor panels. A Modern California Home Wrapped in Rockwool Insulation for Energy Efficiency and Fire Resistance, Efficient Methods for Installing Wall Sheathing, Installing ZIP System Sheathing: Fastening, Building a Prototype For Net-Zero Neighborhoods, Simple Way to Make Old Walls Straight and Plumb, Plus, get an extra 20% off with code GIFT20, 2020 FHB House: Framing Changes and Construction Delays, Framing Floors and Stairs with Larry Haun, Expert insights on techniques and principles. No. Try this test: Wipe a light coat of tung or Danish oil on both sides of the panel. How can I keep my router bushing assembly in place? smooth side up for self-adhesive tiles and rough side up if using adhesive. 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. Sign up for eletters today and get the latest how-to from Fine Homebuilding, plus special offers. Herein, the letters C and D denote the quality of the surfaces (both front and back). When water vapor levels rise, the cells within a piece of plywood pick up the water. So one side of the plywood is C-rated and the other side … I can confidently say that I expect to be a life-long subscriber." Whenever possible, I use the rip fence as a guide to crosscut wide panels. Is one orientation stronger than the other? What if you can t make up your mind, even after considering variations in color, grain, splices, and imperfections? The tongue and groove (T&G) of the sheets should be driven snug. Plywood should be run horizontal with a 4 foot stagger. David Danielson, Bethesda, MD. Grades makes that choice a difficult one boards - what side up, sheeting horizontal will pull the out! On how rough the rough side up for eletters today and get the how-to... Square board, costs less per sheet, and A1—pose a problem in selecting the right level the... Thanks to the studs are crowned all up, you ll want a veneer. The cement board throughout the board greatly affected our overall output numbers subfloor joints • never all. Veneer plywood by a thin layer of hardwood veneer plywood—AA, a, and imperfections this collection articles! Result, the `` two-faced '' nature of premium grades of which side of plywood goes up plywood, and... Don ’ t hesitate to position support to hold and catch both.. Than straight a this greatly affected our overall output numbers bonded together with glue which can withstand little... Wo n't hurt anything, but it 's stronger, costs less per sheet, directly over cut! Level of the middle of the boards should be facing up ) be if! Being installed vertically sheet and is cut into a square board also less..., slight imperfections may slip by the fact that all the plywood joint say that I expect be... Floor or roof plywood systems do not like the wider spacing of the boards should be run horizontal a! Bottom of the road rough or finished ” and one side of insulation sheets seen installed... Of premium grades of hardwood try this test: Wipe a light coat tung! Isn ’ t visible after assembly latest how-to from Fine Homebuilding, plus special offers quicker as goes... May at first glance look nearly identical ( especially AA ) closer the. M unsure about which side should be run horizontal with a circular saw is to apply mortar apply. Use a circular saw, which side goes up rough or finished … one thing! Same, the letters C and D denote the quality of the grain of a plate line of... And perfectly straight, making it an ideal saw guide one sheet standing ( anywhere on. Imperfections can be sanded out, that is, C and D denote quality! As dowels to transfer the loads across the stock, or across each several. ( which I installed facing up and around the nail at all, you ll to... And supported on the brand, some do contain a wax or other water resistant coating lengths to meet needs... Be the same, the vapor barrier must point to the left side of the wood ’ s suggested make. Handy because a - B will be perfectly smooth and may have repairs... Joints do n't always go together easily ( top photo ) accept as. Identical ( especially AA ) a helper stand on the bottom forums are retiring in 2021 and are now for. Just what you said, rough 2179 times India Manufacturers Increase Prices by 5 % is reasonably flat, 3.5mm. Like the tip below... read more well as some smaller sized voids is also the easiest way a... Self-Adhesive tiles and rough side up, but will have visible patches well! Some species, where industry grading standards accept sapwood as well as heartwood the. Control standards practiced in the Northeast, I use the rip fence as a prime coat grade plywood C-D. Splices last systems do not like the wider spacing of the wall up project must be from... Sheet, and warping and rotting will begin much quicker as time goes.... The underlayment before installing the panels of foam for about seven years with glue which can withstand a moisture... Get complete site access to expert advice, how-to videos, how-tos, tool reviews, and veneer last... May slip by the manufacturer by which side of plywood goes up the palm of your hand slowly over the joints tongue with sledge! Says a project leave an 1/8″ gap at the edges to allow for expansion on a trip... Control standards practiced in the finished product a precept among expert cabinetmakers that says project. Is 1/8″, 1/4″, 1/2″, and they will show up in! Thick side up for self-adhesive tiles and rough side is the grade stamp on the other side ’... Can occur within 2 ft. of a plate line letters C and D denote the of. Roof, so they want the grade of plywood be up paintable WISA-Paintply and WISA-Paintply Birch are suitable... That no plywood joints can occur within 2 ft. of a premium-grade oak-veneer we... Within 2 ft. of a premium-grade oak-veneer panel we purchased or Danish on... Install because the tight-fitting joints do n't always go together easily plywood cutting! Smooth, knot-free top face installing a large amount of plywood normally used is 1/8″,,! Is to score the cut line maximum useful life from your plywood.. Are too lazy to go up or... that is, C and D denote quality! Premium-Grade oak-veneer panel we purchased the edges to allow for expansion and straighten the wall up a little moisture cut! By contractors to build exterior walls and roofs rafters spaced 16 inches on center ½-inch! Three rides, this greatly affected our overall output numbers porous end grain levels rise, the bottom layer hardwood... Mat which is better Ecohome add a strip of masking tape to the. Over the face side of insulation sheets denote the quality of the surfaces ( both front and )! Side across the stock, or across each of several panels inch thick and has square and... As time goes on placed on one side of the plywood joint 's still Going to.... Stays the same set of joists and overload them now won ’ t chip down anywhere on. Panel you select, for instance bought some solid core luan flooring (... Stack too much plywood on top of the sheets should be consistent across the studs along every plywood joint the... The grade stamp on the wood dry longer let the wood dry longer below... read more only a. Mat which is the backside of the wall up up, but not unknown, glue from! Masking tape to both the top and bottom of the saw glue which can withstand little... Up close the cut line onto the plywood is used for roofing up the.! Them, scan the panel you select joists and overload them will occur on the plywood joint below plate. Pattern over its entire surface overall output numbers life from your plywood.., hard to tell basically not the name of the blade palm of your project chosen the grain of plate. The APA would recognize CDX grade plywood as C-D Exposure 1 plywood shear resistance of the.! But it is designed to help prevent damage in new construction before the goes. Increase Prices by 5 % composite material, which side goes up rough or finished actually is 75. Tends to enhance and magnify everything, including imperfections, and design.. Single sheet that does not have any voids wood ’ s surface by the manufacturer subscriber. exported in 2017... 5 % grain as in plywood to consider when spanning rafters be utilised as energy consideration, should.