So, which one is better, the old-fashioned plywood or the OSB? OSB and plywood vary in terms of durability. On the other hand, OSB releases more formaldehyde (which is a carcinogen that is off-gased) than plywood. One 23/32-inch 4x8-foot plywood piece weighs approximately 67 pounds, while a piece of OSB of the same dimensions weighs approximately 78 pounds. Advantages of Plywood. It also warps or swells after water absorption and will not return to its original shape. We form the layers by shredding wood and then joining them together with adhesive. When it dries, it is more likely to return to its regular shape. Being a wood based material, plywood has the ability to accommodate the occasional short-term overload, up to twice the design load. The material tends to be thicker and needs to be made to more exacting standards, which increases costs. When it dries, it is more … OSB has over 70% market share for structural panels. OSB was introduced in the 1970s and steadily gained market share from plywood, surpassing plywood in production in 2000. Because of this manufacturing process, OSB is at least half the cost of CDX plywood. Plywood absorbs water more quickly, but it also dries more quickly. Plywood is made of many layers of very thin wood, called plys, pressed together with glue. Moisture also affects the strength of plywood; so while exterior glued plywood can be used outdoors, it works best when moisture content remains low. While plywood is often 6 feet per sheet, OSB may be much larger, up to 12 feet per sheet. OSBs are wood panels used as an alternative to plywood because they cost less than plywood and have greater uniformity and stiffness. Today OSB has 70-75% market share and plywood has about 25% share. I use both OSB and plywood for constructing small/medium projects, rarely would you want to use OSB for anything other than interior work. Both can be used in structural applications for roofs, walls and floors. Hardwood plywood is already available with soy-based glues and other materials that do not release urea-formaldehyde into the air. Also, since the entire floor will be built with the same product, some care should be taken in deciding whether its worth it to risk potential moisture in bathrooms and kitchens that could cause OSB sub- flooring to buckle and rise at the joints. When used beneath tile, it can squeak when stepped on at best, and at worst, it may cause the grout 3 or tile itself to crack. Cost varies greatly by region (and even by zip code).To get free estimates from local contractors, please indicate yours. OSB doesn’t hold screws, nails, and fasteners as firmly as plywood. It has more decay resistance than plywood. As OSB is cheaper than plywood and has the strength and durability of plywood it is becoming more widely used than plywood. © 2020 Fixr, all rights reserved. Similar to plywood but more uniform and cheaper. For that reason, plywood is usually the recommended substrate if a wood substrate is needed. A viable alternative to plywood, this OSB Board is engineered to prevent any cupping, warping or splitting. Numerous choices are available for this purpose, but the two most commonly used products are oriented strand board (OSB) and plywood 1. Neither material has any real impact on the resale value of a home. OSB is made of many smaller pieces of hardwood and softwood mixed together in strands. More expensive than OSB (about 15% to 30% more) But can also be manufactured from fast growing species and smaller trees. OSB weighs more than plywood. TechShield Radiant Barrier Sheathing 15/32 CAT PS2-10 Radiant OSB, Application as 4 x 8. Plywood offers all the inherent advantages of the parent wood plus enhanced properties in its laminated structure. OSB does not have the same track record because it has only been marketed for about 30 years. Secondly, OSB panels have a higher shear rating than plywood panels and are thus often installed with greater spans than plywood of the same thickness. Installing either sheathing over a 500 square foot area would cost roughly $160 in material for plywood and $100 for OSB. This is useful where seismic, The cross laminated construction of plywood ensures that plywood sheets remain relatively stable under changes of, The panel shear of plywood is nearly double that of solid timber due its cross laminated structure. It is made of many strands or smaller pieces of wood pressed together, which gives it a rougher texture. Plywood absorbs water more quickly, but it also dries more quickly. Both OSB and plywood absolutely hate water, Lipinskiy mentions, going on to say that the most important part, regardless of which decking option you choose, is that all penetration points on a roof are sealed. [1], Both plywood and OSB are used for sheathing roofs, walls and subfloors. Here we will look at each material more closely and see how they stack up. Odd number of layers with grains of adjacent layers at right angles to each other. Plywood is the more traditional and familiar of … The strips are sifted and oriented in belts or wire cauls. OSB panels can be manufactured in lengths up to 16 feet (or sometimes even higher), while plywood is generally limited to 8 to 10 feet. Of the two products, OSB is considered the greener option. The layers can vary in thickness to give different finished products. Aspen and Poplar tree species are used. OSB is made by combining glue, resin, and wood chips and pressing them into the shape of a plywood sheet then baking everything together. About OSB. One of the reasons for this is because OSB is cheaper than plywood—around $3 less per sheet—which makes quite a difference when it comes to a large-scale project. Plywood can have many different styles and appearances. By using Fixr you agree to our Terms & Conditions and Privacy Policy. Will no longer contain formaldehyde in 2019. What is CDX Plywood vs. OSB? Manufactured from waterproof heat-cured adhesives and rectangularly shaped wood strands that are arranged in cross-oriented layers, OSB is an engineered wood panel that shares many of the strength and performance characteristics of plywood. Plywood is familiar to most people—it is a sheet material made from layers of wood oriented in opposite directions from layer to layer. Oriented Strand Board Oriented Strand Board (OSB) is a material Oriented Strand Board (OSB) is a material with high mechanical properties that make it particularly suitable for load-bearing applications in construction. While a sheet of plywood might be 5 to 7 plies thick, a sheet of OSB is made from as many as 50 strand layers packed and compressed into the same thickness. However, these days roofing can be made out of OSB or Oriented Strand Board. Therefore, it is generally installed beneath a finish material, such as siding. Here are some things to consider when choosing your decking material to install on a roof. OSB and plywood offer similar (and sufficient) performance in terms of strength and functionality, though plywood is about 7% stronger. OSB and plywood are formed from smaller pieces of wood and come in large sheets or panels. When used structurally, the materials are hidden, and often not disclosed at the time of sale, which means that they have no impact on costs. Then joining them together with glue easier to use that because it not... Estimates from flooring contractors in your area of expertise absorption and will not return to its original.! Equally well as shear-wall components and can be farmed but plywood requires diameter... Osb win against plywood when it comes to shear strength same track record because it holds nails slightly than! 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