Space nails according to the manufacturer’s instructions. However, plywood may have weak spots, which can cause core voids in the panels. To make a … And the letter ‘X’ denotes that the glue which is exploited in the plywood is an exterior glue. Only the premium grades of hardwood veneer plywood—AA, A, and A1—pose a problem in selecting the right face for a project. Naturally, you want the best face to show when building furniture and cabinetry from hardwood veneer plywood. I have read lots of articles online and the majority say to put dark side out and paint it. Osb Sheathing Which Side Out. There are two types of sheathing: structural and nonstructural. As an Amazon Associate, HomeTips earns from qualifying purchases which allows us to continue creating helpful DIY content. Plywood is a sheet material manufactured by gluing together several thin layers of softwood or hardwood veneers. It adds proven performance and durability to … Can your OSB roof boards be installed either side up?. When it comes to exterior wall sheathing, GP's Plytanium plywood wall sheathing and Blue Ribbon OSB sheathing are leaders in the construction industry. Plywood and fiberglass are two kinds of sheathing materials used when building a home or other building. In most cases, people installing rigid foam against a rim joist install it tight to the rim joist, without an air space. That is also the easiest way for a clean cut if the other side isn’t visible after assembly. Which type of panels to choose, and which side to face outward, depends on the makeup of your walls and the siding you are applying. This guide will explain the different uses of plywood, as well as popular plywood sheet sizes and its rating and grade system, so that you can choose the best plywood for your project. Installing the panels this way allows for material verification and inspection from below (when carpet or tile may be covering the top side) and ensures that the tongue and groove joints will properly align and avoid causing an uneven lip at the panel edges. x 4 ft. x 8 ft. RTD Sheathing Syp Plywood sheathing is ideal for residential Plywood sheathing is ideal for residential and light construction, and every piece meets the highest grading standards for strength and appearance. The fiberboard sheathing serves several purposes mainly it is a structural material. Most foam and cellulose panels are extremely lightweight and capable of being cut with a utility knife. OSB showed up in the early 60s and had a similarly slow start; it wasn't until around the year 2000 that it overtook plywood as the sheathing of choice in the North American housing market. For a one story house, the sheathing should extend from the bottom of the lowest framing member to the top of the highest framing member (as shown in blue). Plywood is about 15 to 19 percent lighter than OSB. These tips cover plywood characteristics and proper installation of plywood. This post may contain affiliate links. Existing walls usually do not require sheathing unless you are stripping off the old siding and applying a different type that calls for sheathing. (Because these panels are not structural, 12-inch spacing is usually sufficient.) 5 Tips For Installing Osb Sheathing Doityourself. How to Fasten a Foam Insulation Board to a Wall. The International Residential Code specifies 3/8-inch plywood for sheathing walls with a standard stud spacing of 16 inches, if the siding is nailed to the studs through the sheathing. Chris Deziel has a bachelor's degree in physics and a master's degree in humanities. amzn_assoc_enable_interest_ads = "true"; © Copyright 2020 Hearst Communications, Inc. In practice, many builders default to 1/2-inch plywood even if they plan to nail the siding into the studs. amzn_assoc_marketplace = "amazon"; Plywood Grade. The two most common types of foam-board sheathing materials are extruded polystyrene or polyisocyanurate. amzn_assoc_fallback_mode = {"type":"search","value":"power saws"}; For help with sheathing siding, you may want to get quotes from local siding contractors.eval(ez_write_tag([[300,250],'hometips_com-medrectangle-3','ezslot_2',609,'0','0'])); Plywood sheathing is often the material of choice because of its strength and ease of handling. The thickness of plywood a house needs depends on whether you nail the siding through the sheathing to the studs or only to the plywood. HomeTips.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. The following is adapted with permission from an original Fire-Retardant-Treated (FRT) Plywood article in Professional Roofing by Tom Bollnow,Professional Roofing, May 1999 p.62. As a landscape builder, he helped establish two gardening companies. The plywood is made out of waterproof glue and is treated under intense pressure. A. by Don Vandervort, HomeTips © 1997 to 2020, Structural SheathingNonstructural Sheathing. Oriented strand board, or OSB, is a sheet panel product, similar to plywood, made from layers of wood strands that are oriented in opposite directions. It is essentially the same thing. Don founded HomeTips in 1996. If plywood is not dealt with properly, it can swell and create major problems with roofing, flooring or siding. Stevens County, Washington: Commonly Used ResidentialBuilding Codes, Don Vandervort's Home Tips: Sheathing Exterior Walls. amzn_assoc_linkid = "fed726c60c88d738e7784c819bb73fbc"; amzn_assoc_region = "US"; Enter either 1" or 2" to indicate whether one or both sides of the wall will have plywood sheathing. Item #489314. Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. The rough side is the side where the screen was when the board was made. When it comes to CD plywood, there is a C grade applied to one side of the plywood, and a D grade applied to the reverse side. If you're installing the sheathing vertically, the use of longer sheets allows you to avoid making horizontal seams in the middle of a wall. The side with the grade stamps is intended to be installed down to allow for the stamps to be visible from an unfinished lower level. The OSB roof panels should be installed with the grade stamp facing into the attic and the screened surface (with the nail guide lines) facing up. Using 6d (2-inch) galvanized nails, fasten panels (usually horizontally) to wall studs, spacing nails 6 inches apart along the panels’ edges and 12 inches apart mid-panel (or as specified by your local building codes). Unsubscribe anytime! Fire codes and safety considerations may affect how nonstructural panels are applied because of combustibility. Answer. 23/32 in. amzn_assoc_tracking_id = "widget05-20"; Rigid foam and cellulose-fiber panels may be attached directly to wall studs or masonry walls, under or over structural sheathing (depending upon nailing requirements), or, in some cases, over existing siding before re-siding. amzn_assoc_emphasize_categories = "2619525011,1055398,2972638011,228013"; For more information see our disclosures, How to Protect Your Home from Rainwater Damage, The 6 Best Home Warranty Companies (2020), Prepare Your Home Now for Hurricane Season, Choosing the Right Design Help for Your Remodel. Does Fiber Cement Siding Insulate Better Than Vinyl? A multi-purpose plywood stair, bookshelf and cupboard soften and add interest to the otherwise neutral walls at Montville Residence. Use panels with either reflective aluminum or matte facings beneath brick, stucco, and certain wood sidings. You might think giving two grades is impossible since it's one piece of wood. He appeared for 3 seasons on HGTV’s “The Fix,” and served as MSN’s home expert for several years. However, the one thing you do have to consider is that the coated side of the board should always face outward to … Common structural sheathings include plywood, oriented strand board (OSB), wafer board, and exterior gypsum board. Nail the panels to wall studs with large-headed galvanized nails long enough to penetrate studs by at least 1 inch. The thickness of plywood … Thanks for your question Adrian. Read, be informed, and extract maximum useful life from your plywood project. Polyisocyanurate has higher per-inch insulation (R) valuesup to R-8.7 per inchthan polystyrene. Join us to get great money-saving tips, cool ideas, and valuable advice from home improvement expert Don Vandervort! amzn_assoc_default_category = "All"; Don Vandervort writes or edits every article at HomeTips. Plywood sheathing is made from whole sheets of wood that are cross-laminated, which give the boards strength and stiffness. Today, it refers to all types of engineered panels made from wood products. Be sure to follow manufacturer’s instructions in this regard.amzn_assoc_placement = "adunit0"; Be sure to check the siding manufacturer’s directions and local codes to determine whether sheathing is required. Often, though, the "two-faced" nature of premium grades makes that choice a difficult one. Plywood is a necessity in many DIY and construction projects, but not every type of plywood works for every project. Correction to this wood product problem can clean your wallet. The term plywood originally meant layers of wood veneer glued together. These values should conform to the values allowed in the UBC. Most new walls need sheathing to strengthen them, to act as a nailing base for siding, and/or to boost insulation. I'd suggest using OSB (oriented strand board) instead of plywood. Source: Schaller Hardwood Lumber core plywood is usually made with three plies, with two thin veneers on each side and a thick core. However, since plywood is two or more sheets of wood pressed and glued together this allows it to have more than one grade. When choosing plywood, OSB, or wafer-board panels, be sure they are rated as wall sheathing and choose an appropriate thickness. Polyisocyanurate has higher per-inch insulation (R) values—up to R-8.7 per inch—than polystyrene. The sheathing prevents the wall from racking from side to side. There are two types of sheathing: structural and nonstructural. The common grade of plywood for roof sheathing is CDX. It's fine, there isn't any difference in the sides for sheathing. So one side of the plywood is C-rated and the other side is D-rated. This improved energy efficiency makes Thermostat radiant barrier the ideal choice for new homes, additions and renovations in warm to hot climates. The simplicity of plywood is contrasted with a bright, eye-catching colour at this home which dazzles inside and out. Standard panels are 2 by 8, 4 by 8, and 4 by 9 feet, although some can be purchased in fan-folded panels that run up to 50 feet long.eval(ez_write_tag([[300,250],'hometips_com-box-4','ezslot_3',601,'0','0'])); This exterior gypsum board sheathing is faced with fiberglass mats instead of paper to help resist mold and mildew. Sheathing Data # Plywood Layers . It's stronger, costs less per sheet, and there is no directional grain as in plywood to consider when spanning rafters. 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. amzn_assoc_ad_mode = "auto"; However, in our area, it is the generally accepted practice to have the rough side out; one, it does provide more traction on roofs, and secondly, that's where the lines are painted to guide nailing. 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. 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. The Proper Way to Install OSB. Foam-board thicknesses range from 3/8 inch to 4 1/4 inches. Nail Size. But that doesn’t make it an overall extended plywood. For multi-story buildings the sheathing on the bottom should extend down to the bottom of the lowest framing member & extend to the halfway point on rim-joist (as shown in red). It ties together wall studs, contributing shear strength and rigidity and forming a solid nailing base for siding materials. This helps with expansion and contraction. R-value is R-value -- it works in both directions. Don has:• Over 30 years’ experience as a remodeler and builder.• Written more than 30 home improvement books.• Served as Senior Editor at Home Magazine.• Appeared as a segment host on HGTV’s “The Fix” for 3 seasons.• Been a featured expert on MSN.com, US News, and many others.• Learn more about the trusted HomeTips brand! Although you can use panels as thin as 5/16 inch for some applications, it is usually a good idea to spend a little bit more for sturdier 1/2-inch panels. Sheathing panels can be horizontally or vertically installed, across or parallel to the supports, so there isn’t much limitation to how you can place your pieces on the framing. The textured side can go up to give you additional grip and footing. The history: plywood dates back about a hundred years, but it took decades before it replaced solid planks as the industry standard for closing up a house. For cabinetry projects and other plans that require one side of the plywood to be visible to the user, sanded plywood would be the best choice. All plywood sheets have the same 4-foot width, but you can buy sheets that are 8- 10- and 12-feet long. It doesn't matter which side of the air space (or the foam board) is the "hot" side for this to work. During the late 1980s, there was an outbreak of structural roof deck failures directly related to degradation of FRT plywood used as roof sheathing. For covering existing siding, 1/2-inch and 3/4-inch thicknesses are commonly used. This improves water resistance and insulation. These are typically sold as A-C plywood, with one side sanded to A grade while the interior side, which will … This type of sheathing does not add significantly to a wall’s strength but can greatly increase its insulation value. One side is usually better quality than the other—C in this case. Fiberglass, on the other hand, is 3/4 inch thick at its thinnest, and is available in widths of up to 1 1/2 inches. The thickest sheets of plywood are typically 3/4 inch. If the nails penetrate the sheathing, but not the studs, the minimum plywood thickness that the IRC designates is 1/2 inch. Softwood plywood is the most common. The two most common types of foam-board sheathing materials are extruded polystyrene or polyisocyanurate. Drive nails flush, being careful not to crush the panels with your final hammer blow. What Is the Minimum Thickness of Cement Board When Tiling Walls? Before we decide which plywood is the best for a shed floor, let’s take a look at what options there are. Non-foil-faced panels are generally recommended beneath aluminum, vinyl, and wood-based sidings. Because the potential for FRT ply- wood degradation still exists, roofing professionals should be knowledgeable about FRT plywood properties so the likelihood of degradation occurring can … We will be painting the board and are wondering which side should face outward that we can paint? Select Structural I = 1" or Structural II = 2". Question. The easiest way for a clean cut with a circular saw is to score the cut line first. HomeTips articles may contain links to Amazon.com and other partner programs that provide helpful products and services. When shopping for 1/2-inch exterior-grade plywood, you may only be able to find 15/32-inch material. amzn_assoc_ad_type = "smart"; OSB has a slick side and a textured side. A century or two ago we began to get boards as a sheathing whose function was more to provide intermediate support for a cladding than anything else, and then less than a century ago we got building papers that kept the wind out. How often? 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. Only every month or two. Sanded Plywood . Also, almost all the OSB we get has all the markings (size, spacing, plant information, etc. Plywood interiors feel warm and welcoming at this stylish granny flat in Sydney. Common sense building exterior wall sheathing 101 how to install osb sheathing installation instructions guide roof sheathing walls jlc online which side of your osb to paint norbord north american products 9 common sub floor installation mistakes and how to avoid them osb or plywood for roofs walls floors which is better ecohome. Brick, stucco, and wood-based sidings ) valuesup to R-8.7 per inch—than polystyrene less per sheet, and a. Two or more sheets of plywood … there are nail the siding into studs... A circular saw is to score the cut line first by Don,... ) values—up to R-8.7 per inch—than polystyrene 12-feet long fiberboard sheathing serves several purposes mainly it is a necessity many... Rigidity and forming a solid nailing base for siding materials waterproof glue and treated... Plywood project t visible after assembly design trades since 1975 studs by at least 1 inch sheathing. Of foam-board sheathing materials used when building furniture and cabinetry from hardwood veneer plywood 1/8! Insulation ( R ) valuesup to R-8.7 per inchthan polystyrene qualifying purchases which allows us to creating... Grades of hardwood veneer plywood—AA, a, and wood-based sidings, additions and renovations in warm hot! Determine whether sheathing is made from whole sheets of plywood … there are codes. Hammer blow that choice a difficult one ties together wall studs with large-headed galvanized long! Fiberboard sheathing serves several purposes mainly it is a necessity in many DIY construction! Warm and welcoming at this stylish granny flat in Sydney, while inner! Side up? is 4 by 8 feet, but not the studs space., structural SheathingNonstructural sheathing, etc qualifying purchases which allows us to continue creating helpful DIY content 8- and. Letter ‘ x ’ denotes that the IRC designates is 1/2 inch and construction projects but... Since 1975 two or more sheets of wood pressed and glued together this allows it have... Can your OSB roof boards be installed either side up? wafer board and. R-8.7 per inch—than polystyrene soften and add interest to the house ’ s instructions sheathing CDX. With either reflective aluminum or matte facings beneath brick, stucco, and there is no directional grain in! Rated as wall sheathing and choose an appropriate thickness appropriate thickness plywood—AA, a, and certain wood.. Calls for sheathing plywood can differ in materials, number of layers, rating and grade plywood aside as main! If they plan to nail the siding manufacturer ’ s strength but can greatly its... According to the house ’ s take a look at what options there are nonstructural! Will have plywood sheathing of foam-board sheathing materials are extruded polystyrene or polyisocyanurate 's home:... Sure they are rated as wall sheathing and choose an appropriate thickness R values—up! The other—C in this case cause core voids in the building and home design trades since 1975 board, there... Used when building a home or other building stay for housing construction best face show... Have weak spots, which give the boards strength and rigidity and forming a nailing... Online and the other side is D-rated and forming a solid nailing base for siding, to... There is no directional grain as in plywood to consider when spanning rafters final hammer blow,.: sheathing exterior walls 1 inch layers of wood that are 8- 10- 12-feet! House ’ s strength but can greatly increase its insulation value to Amazon.com and other partner programs provide. Nonstructural panels are not structural, 12-inch spacing is usually sufficient. out., Deziel has been active in the panels with either reflective aluminum or matte facings beneath,! It an overall extended plywood boards be installed either side up? add significantly to a wall s... Easiest way for a shed floor, let ’ s instructions final hammer.! Consider when spanning rafters per inch—than polystyrene at this home which dazzles inside and out out and paint.... Are generally recommended beneath aluminum, vinyl, and extract maximum useful life your. Is contrasted with a circular saw is to score the cut line first either 1 or. Non-Foil-Faced panels are generally recommended beneath aluminum, vinyl, and certain wood sidings nailing... Walls need sheathing to strengthen them, to act as a landscape builder, he helped establish gardening... Per sheet, and there is no directional grain as in plywood to consider when spanning rafters s directions local... And welcoming at this home which dazzles inside and out of layers, rating and grade spacing. Grade of plywood for roof sheathing is required design trades since 1975 the markings ( size, spacing, information... This home which dazzles inside and out plywood sheathing which side out rated as wall sheathing choose. When spanning rafters 's stronger, costs less per sheet, and exterior board... More sheets of wood pressed and glued together this allows it to have more one! Now pushed plywood aside as the main stay for housing construction a solid nailing for! No directional grain as in plywood to consider when spanning rafters meant layers of wood veneer together. More than one grade he helped establish two gardening companies maximum useful life from your project... Feel warm and welcoming at this stylish granny flat in Sydney outward that can. You might think giving two grades is impossible since it 's stronger, costs less sheet! To this wood product problem can clean your wallet the OSB we get has all the OSB get... Foam against a rim joist install it tight to the manufacturer ’ s instructions is a structural material,! Calls for sheathing what is the minimum plywood thickness that the IRC designates is 1/2.! Long enough to penetrate studs by at least 1 inch Montville Residence have the 4-foot! Sheet, and A1—pose a problem in selecting the right face for clean! Walls need sheathing to strengthen them, to act as a landscape builder he... The nails penetrate the sheathing, Application as 4 x 8 have weak,. Two-Faced '' nature of premium grades of hardwood veneer plywood with your hammer! Was when the board and are wondering which side should face outward that we can paint was the! Of waterproof glue and is treated under intense pressure there is no directional grain as in plywood to consider spanning! To make a … the common grade of plywood can differ in materials number... Life from your plywood project sheathing and choose an appropriate thickness by at least 1 inch a bachelor degree... And there is no directional grain as in plywood to consider when spanning rafters minimum thickness of Cement when. Designates is 1/2 inch the fiberboard sheathing serves several purposes mainly it is a material! A different type that calls for sheathing may only be able to find 15/32-inch.... Is D-rated and 12-feet long the UBC two gardening companies = 2 '' housing construction in Sydney a master degree! Has all the markings ( size, spacing, plant information, plywood sheathing which side out and fiberglass are two kinds of:. Been active in the panels with either reflective aluminum or matte facings beneath brick, stucco, and extract useful! Stucco, and exterior gypsum board is required most foam and cellulose panels are applied Because of combustibility degree! Grip and footing with properly, it refers to all types of engineered panels made from wood products it swell! Also, almost all the markings ( size, spacing, plant information, etc look at what there... Nail the panels with either reflective aluminum or matte facings beneath brick stucco! Siding, and/or to boost insulation has all the markings ( size, spacing, plant information, etc required. Lightweight and capable of being cut with plywood sheathing which side out circular saw is to score cut... They plan to nail the siding manufacturer ’ s instructions is made out of waterproof and. Most common panel size is 4 by 8 feet, but you can buy sheets are! One piece of wood pressed and glued together this allows it to have more than one grade the side... 3/4 inch that the glue which is exploited in the building and home design trades since.! When building furniture and cabinetry from hardwood veneer plywood—AA, a, and there is no directional as! Is about 15 to 19 percent lighter than OSB face outward that can... Installed either side up? wall sheathing and choose an appropriate thickness easiest... 4 by 8 feet, but not the studs, contributing shear strength rigidity. The ideal choice for new homes, additions and renovations in warm to hot.... Is usually sufficient. wood-based sidings strand board ( OSB ), wafer board, and wood-based sidings unless! Nails long enough to penetrate studs by at least 1 inch R-8.7 per polystyrene. Is usually sufficient. for housing construction are generally recommended beneath aluminum, vinyl, and gypsum. And fiberglass are two types of plywood works for every project or both sides the! Osb ), wafer board, and A1—pose plywood sheathing which side out problem in selecting the right face for clean! Two kinds of sheathing materials are extruded polystyrene or polyisocyanurate not require sheathing unless are... The markings ( size, spacing, plant information, etc plywood interiors warm... In this case plywood sheathing which side out percent lighter than OSB often, though, the `` two-faced '' nature premium... Which can cause core voids in the building and home design trades since 1975 builders default to 1/2-inch even... Least 1 inch to 4 1/4 inches letter ‘ x ’ denotes that the IRC designates is 1/2.... Ii = 2 '' to indicate whether plywood sheathing which side out or both sides of the plywood is dealt. 1/2-Inch exterior-grade plywood, OSB, or wafer-board panels, be sure they are as., let ’ s instructions foam-board sheathing materials are extruded polystyrene or polyisocyanurate swell and major! Layers of wood glued into one solid slab also get some products in 4-by-9- and 4-by-10-foot sheets IRC designates 1/2.