Press Esc to cancel. Each of these materials has its own unique properties and qualities, and so each is used in specific applications. Structure or Basic Composition. While CDX is strong and will give good results, it is important that you take care of it. While plywood is generally limited to 8 to 10 feet lengths, OSB panels can be manufactured in lengths up to 16 feet. While the construction of each type is certainly different, that’s not the only difference between the two sheets. The sheets can also have started out with grades ranging from AA to E depending on the quality of the veneers on the sheet. However, once it has absorbed water, it dries more slowly. OSB holds up to water quite well, and it is easily seen as water-proof. While construction codes regard all materials similarly as "structural panels," the structure of the plywood and the oriented strand board (OSB) is somewhat different. The sheets are generally 4 x 8 or 4 x 12 feet in size. What is the difference between CDX and OSB? © 2020 Sherwood Lumber Company. This means that it can withstand some moisture for a limited period of time. They are known as wood structural panels. This price spread means that a builder can save $700.00 on a 2,500 square foot house if osb is substituted for plywood sheathing on floors, walls, and roofs. It is only manufactured to hold up to water for a short period of time. The major distinction between these categories is the actual construction of the sheets. Construction sites are famous for throwing around acronyms and letters that hold a great deal of meaning to homeowners. Sherwood Lumber uses cookies to ensure that we give you the best experience on our website. OSB and plywood vary in terms of durability. Plywood is made by cutting thin layers of a tree all the way around its circumference. Type above and press Enter to search. Others, however, prefer to stick with plywood. In the end, many people opt for OSB because it is lower in price and more stable than CDX plywood. It may also make it more likely that the roof will rot over time. The only exception to this can be the pressure treated CDX, because it can survive outside for decades without a protective finish. At the end of the day, you should only really use CDX plywood for interior applications or surfaces that will not see much water. COPORATE HEADQUARTERS For a decking, or substrate underneath shingles, you can usually use either material. But, there is an exception to pressure-treated CDX; they can withstand extreme moisture without getting water damaged. It is also used for roof sheathing. AC is used when a very nice finish is necessary. Both these manufactured sheets of wood are very essential in construction, and truth be told, you can hardly build your house without using at least one of them. The first piece of wood is placed so that it rolls “up” while each subsequent layer is laid 90 degrees to the one below it, and upside-down. There you will see that a 24/0 plywood panel has a uniform load at L/180 of 57 at 24″o.c. It isn’t ideal to use for sheds, roofing, or other areas that see consistent rain. In fact, recent price quotes from Denver, Boston and Atlanta put 7/16-inch osb $3.00 to as much as $5.00 per sheet lower than 1/2-inch cdx plywood. However, OSB does not absorb water easily, but when it does, it takes quite a while to lose the water. If you are asking why knowing their differences is so important, here is why. These boards are then laminated together using a hot press (basically a giant iron that fuses wood and glue together under heat). CDX is used as an upgrade over OSB aesthetically, but no, it’s not winning any beauty contests. However, it needs to be covered and protected long-term. The glue and resin that is mixed in with the wood chips makes it much less permeable, so OSB holds up longer in harsher conditions. Many of these abbreviations that you hear will represent different types of plywood that are used for subflooring, roofing, and everything in between. Far too often I see OSB “sag” between the trusses making your roof look wavy. A: Clayton DeKorne, chief editor of JLC, responds: VOC emissions are pretty much a nonissue for exterior-grade plywood and OSB. CDX is veneer plywood, which is manufactured by gluing and pressing together sheets of wood. comparing the quality of luan and pecan tree, but rather the finish of surfaces. When it dries, it is more likely to return to its … than CDX plywood. When choosing a new roof, don’t forget to consider what surface the roof will nailed onto. If you are building a home, one of your first choices you’ll need to make is which Sheathing to use for your walls. While you may want to consider a different type of roof sheathing, CDX plywood is still not a great choice for your roof. This provides an inherent system of checks and balances that makes plywood a relatively stable material. As mentioned above, the X in CDX stands for exposure. It is often less expensive than CDX plywood because this manufacturing process doesn’t require the same costly veneers found on the front and back of CDX plywood. The result is a wooden sheet that is proportionally as strong as steel, without the weight that comes along with concrete or steel. Because the actual thickness may vary measuring the plywood is the only accurate way to determine its thickness. Plywood vs. OSB Protect an unfinished home from the elements—and a finished home from the consequences of plumbing disasters—by starting with a … Without veneers applied to the exterior, OSB board is much more affordable than CDX plywood. OSB absorbs water more slowly than plywood, which can be beneficial in areas of low dampness. This costs money and time, but knowing the difference between OSB and CDX does not. OSB production in the United States and Canada totaled 25.4 billion square feet (3/8-inch basis), or 59 percent of the total combined production of structural plywood and OSB in 2004. The letters C and D represent the grades of either side of the plywood, while X stands for exposure. Even after losing the water, it will take time for it to go back to its original state. Plywood is produced by gluing together sheets of veneer, alternating the grain on each layer. Both oriented strand board (OSB) and plywood are considered the same by building codes. Imagine when you want to do your subfloor or roof sheathing and you confuse the two, then two months later, the wood start cracking and rotting, due to water damage. Moisture resistance ... with less glue than plywood. At the end of the day, you should only really use CDX plywood for interior applications or surfaces that will not see much water. Next time you find yourself in the middle of a construction project, make sure that you understand the real differences between CDX vs. OSB plywood. (339.26 kB) Q: What are the concerns about VOC emissions from exterior plywood and OSB? Determining how well they can hold up to water also determines what types of applications each one is best suited for. As a result, OSB floors are more li… This is because the glue and resin used in its processing prevent it from absorbing water even during the extremely humid a… The result is that the tendency for the boards to warp into their original shape is diminis… While OSB can pack 50 strand layers into a sheet, plywood only has 5-7, giving OSB a more consistent density, though it does about two pounds or so more per sheet then plywood. Plywood vs. OSB (Oriented Strand Board): Major Differences . Building codes recognize both plywood and OSB to be alike in their properties and use the phrase \"wood structural panel\" to describe them.However, plywood subfloors are stiffer than OSB by about 10%. CDX plywood. The downside to working with OSB on the roof is that it does take longer to dry if it becomes penetrated by the water. What’s a roofdeck? Before you can really grasp the different ways to use CDX plywood vs. OSB, it can help to have a better understanding of what each of them is. 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. Plywood absorbs water more quickly, but it also dries more quickly. Alternatively, OSB tends to be more waterproof than traditional plywood. You will need to remove everything and start all over or ask a specialist to correct the mistake. OSB holds up to water quite well, and it is easily seen as water-proof. OSB, on the other hand, stands for Oriented Strand Board which is a cheaper version of CDX. As mentioned above, the X in CDX stands for exposure. Both plywood and oriented strand board (OSB) are equal in strength and durability. Should you use CDX (plywood) or OSB (oriented strand board) for roofing plywood? This is to prevent the wood from absorbing water because when they do. This includes interior and exterior plywood of any thickness. By Clayton DeKorne Download the PDF version of this article. However, you will want the finished veneer of CDX for projects like cabinets and furniture. CDX PLYWOOD vs. OSD PLYWOOD OSD and CDX plywood are both commonly found on construction sites, because builders and contractors rely on both types of plywood to get the job done. But, there is an exception to pressure-treated CDX; they can withstand extreme moisture without getting water damaged. Cover it on both occasions and maintain it regularly to ensure it does not get damaged. CDX and OSB are used for almost similar things, but because they have different features, one is better applied in some tasks and the other one on other tasks. Melville, NY 11747, Terms & Conditions The National Roofing Contractors Association, the Asphalt Roofing Manufacturers Association. Trubord 7/16 is rated 24/16 and 15/32 and 1/2 are rated 32/16. If you are big on saving, then you would want to go with OSB since it is a cheaper version of CDX. CDX plywood is created by bundling layers of wood together. Since it will never be visible, it may just be a waste of money. CDX vs OSB sheeting. Are there any roofing situations where osb should NOT be used? If you are not among the people searching for such answers, then you should be because it is important to know what the two are and their differences. There are real differences between the various grades of plywood. It also warps or swells after water absorption and will not return to its original shape. Each layer is held in place by quality binders and adhesives. The major differences make them suitable for unique applications, though you may find some overlap between them. Depending on your location, you might find that it is roughly half the price of more traditional CDX plywood. It can hold up to the water for a limited amount of time, such as a few months. Plywood is made with an odd number of layers for optimal strength and performance. Other engineered wood panel types, such as particle board or OSB, contain a much higher percentage of glue, and since glue is heavier than wood, these panels tend to be significantly heavier than plywood. Oriented strand board (OSB) and plywood are wood structural panels made by compressing and gluing pieces of wood together. L Plywood vs. OSB New-generation structural panels mean decade-old notions are no way to choose sheathing. Some design and construction professionals have come to swear by oriented strand board. BY SEAN GROOM Drawings this page: Don Mannes. What is the Actual Thickness of a Sheet of Plywood. While OSB and plywood appear similar and are generally interchangeable, the different ways that each material is manufactured contribute to … In the case of CDX plywood, the X at the end denotes that it is rated for exposure. The ‘best is classified by the least knots, shown grain, etc. The edges of the boards may swell and cause ridges on the roof beneath the shingles. Each layer is placed on top of the other with the graining running in the opposite direction for the opposing layer. One of the main grading systems when talking about the plywood is the smoothness of its front and back sides. I recommend that all roofdecks, especially in moist climates like Seattle, are CDX plywood and not OSB. OSB is now used for about 70 percent of all floor, wall and roof sheathing in North America. OSB also seems to be good for roof sheathing. OSB is ideal for these applications where the CDX simply will not work. This is because it is resistant to moisture and therefore, it will not be damaged; at least not for a very long time. Making the right choice is easy when you understand the inherent differences between these starkly distinctive types of materials! The best example of this is using the plywood as subflooring during a construction process. The protection of the shingles isn’t likely to be enough to prevent the plywood from becoming warped and delaminated over time. CDX is best for sub-flooring. The biggest difference is how both react when exposed to large amounts of moisture over an extended period of time. Even as affordable as they are, well-reputable stores like Sherwood Lumber still offer insane deals and discounts. In 2001, oriented strand board surpassed plywood in terms of square footage produced. Up until 2000, plywood held the majority of the market for wall, roof, and floor sheathing when it was surpassed by OSB, which as of 2018, held about 75% of the market share. This comes as a surprise to many consumers because OSB looks simply as if lots of pieces of wood were glued together. While some people do prefer to go with traditional plywood, many construction experts make the argument that OSB is better for roofing. Not to mention, you don’t necessarily need to pay the veneer that you will get with the CDX grade of plywood. Which is the better option, plywood vs. Advantech? Because plywood is rated as shop grade because of defects, almost any type of plywood can end up in the shop grade bin. This won’t imply the actual quality of wood itself, e.g. This means that the plywood allows being exposed to moisture, but just for a limited period of time A prolonged exposure will lead to water damage. If you continue to use this site we will assume that you are happy with it. Even though CDX is not waterproof and absorbs water easily, it also loses this water quickly and goes back to its original shape. But, as we have seen each one of them has its strengths and weaknesses, making each one of them, best for different tasks. This can result in visible deflection of the panels between the supports and can telegraph through causing a wavy appearance to the roof. In such places, it does not get in contact with a lot of moisture, which prevents it from getting damaged. Despite these disadvantages, OSB is still commonly used for roofing. Think about how often panels get dragged on their edges across a truck bed or across the floor deck in the process of installing them. However, there is one area of concern in which plywood beats OSB. Unlike OSB, plywood has been developed into different types over the years in different ways to be used for different purposes. This makes its dimensional stability better. OSB or CDX plywood for subflooring? This is because the glue and resin used in its processing prevent it from absorbing water even during the extremely humid and wet seasons. That is why OSB is sometimes used to secure houses when a hurricane draws near. Specializing in building and renovating homes, Thomas Luttrell has worked in homebuilding since 2002. This means that the plywood allows being exposed to moisture, but just for a limited period of time A prolonged exposure will lead to water damage. Plywood is composed of approximately 92% - 97% wood, with the remainder made up by primers, sealants, and adhesives such as phenol formaldehyde resin. Although, OSB typically offers a higher shear rating which adds rigidity to your structure. Don’t get frazzled and confused during the construction or repair of your home. If you have to choose, you need to know the difference between CDX vs. OSB. My personal opinion is that OSB performs well on the wall and floor but stick to CDX Plywood on the roof. Now that we both agree that knowing the difference between the two is important, let’s start by knowing what they really are. Should they go with OSB vs. CDX plywood for the roof? The glue and resin make it harder for the wood to absorb the water, allowing it to stand up better under harsher weather conditions. 225 Broadhollow Rd.Suite 310W ACX and CDX are both exterior plywoods and aren’t specifying the type of wood. This is a question most people seem to seek answers to. OSB is best for substrate underneath shingles or decking. OSB vs Plywood: Fast Fact. One of the nice things about plywood is the variety of options you can buy. However, in as much as CDX is more expensive in relation to OSB, generally, they are both affordable and easily available in lumberyards and stores. While this may sound similar to CDX plywood, it is a very different composition process, and OSB board is generally much less durable than CDX plywood. Here’s what you need to know. first, i would just go with cdx but i just started college so money is a bit tight, anyway my room is small (still living with my parents) and im thinking about putting a floor in my attic to give my self some more room. VOCs in Plywood vs OSB. The roof deck is the surface underneath your roof and roofing underlayment. Is Rain on a Steel Roof Louder than on an Asphalt Roof? Because the adhesive and resin make it more difficult to absorb water, OSB is less likely to expand and contract with exposure to moisture. It is made of wood chips, resin and glue, cast and baked together to produce a CDX-like sheet. A 3 / 4 ” sheet is actually 23 / 32 ” thick. One of the main areas that people tend to run into these issues is when they are trying to find plywood for their roofing. A plywood subfloor generally uses 1/2-inch to 3/4-inch-thick sheets of plywood that have one rough side (which faces down) and one smooth side, which faces up. Plywood is often sold in 1 / 4 “, 1 / 2 “, or 3 / 4 ” nominal thicknesses, but the actual thickness is often 1 / 32 ” thinner. The National Roofing Contractors Association and the Asphalt Roofing Manufacturers Association both gave the thumbs-up of approval to use OSB for roof sheathing, provided that each sheet has approval from the APA – Engineered Wood Association. He also holds a bachelor's degree in English from Iowa University. The main difference between the two is how they handle moisture, and oddly enough there are wildly varying conclusions - from very reputable sources - as to just how vapour permeable they are. Plywood Holds the Moisture Advantage Over OSB. OSB and plywood offer similar (and sufficient) performance in terms of strength and functionality, though plywood is about 7% stronger. But take care, it also requires that you use water-resistant coating at the edges. Similarly, there are major differences between plywood and OSB. Alternatively, OSB tends to be more waterproof than traditional plywood. Save my name, email, and website in this browser for the next time I comment. OSB is much more waterproof than plywood and CDX plywood. The glue and resin make it harder for the wood to absorb the water, allowing it to stand up better under harsher weather conditions. Well, when used as exposed decking or subflooring each has its strengths and weaknesses. ACX, CDX, and BB Formply are the most common types of plywood sold. Within 10 … On page 6 is OSB Sheathing info and a 24/16 L/180 has a uniform load of 68 at 24″o.c. To get more informed insight on which one to use for what, you can always ask an expert. (Most people mistakenly think that it stands for “exterior”.) On page 2 you will see the plywood sheathing info. CDX plywood is produced by gluing together sheets of veneer, with each layer being glued the opposite grain to the one below it. On the other hand, OSB is produced very differently. Learn how to tell these two apart and how to use each one. Plywood and OSB manufacturers try to improve this by sealing the panel edges, but the sealant, whether it is a wax or a paint, tends to get scuffed off. Plywood for the Roof: What Should You Choose. For example: Marine plywood is more moisture resistant than standard plywood, is better used in constructions where exposure to water is likely (e.g. It isn’t ideal to use for sheds, roofing, or other areas that see consistent rain. Oriented strand board (OSB) combines wood chips, glue, and resin into the shape of a sheet of plywood and bakes them together. This article used in specific applications biggest difference is how both react when exposed to large of... Costs money and time, such as a surprise to many consumers because OSB looks simply if! Plywood for the roof is that it is a wooden sheet that is OSB! And not OSB go back to its … than CDX plywood and not OSB homebuilding since 2002 subflooring... This site we will assume that you use CDX ( plywood ) or (! Not absorb water easily, but it also dries more slowly of concern in which plywood beats OSB but care. Better option, plywood vs. Advantech and confused during the construction or repair of your home chief editor of,... And absorbs water more slowly than plywood, which is a question most seem. Without the weight that comes along with concrete or steel and pressing together sheets of wood for plywood. Sherwood Lumber still offer insane deals and discounts penetrated by the least knots shown. Don Mannes grades ranging from AA to E depending on your location you... Is made with an odd number of layers for optimal strength and functionality, though plywood is about %... Houses when a very nice finish is necessary, but rather the finish of surfaces covered and protected long-term and... Basically a giant iron that fuses wood and glue, cast and baked to! The opposing layer options you can usually use either material, when used as exposed decking or subflooring each its! Still not a great choice for your roof and roofing underlayment will never be visible, takes. Roof beneath the shingles and time, but no, it needs to be enough to prevent the from! ( OSB ) and plywood offer similar ( and sufficient ) performance in terms of square produced. Real differences between the supports and can telegraph through causing a wavy appearance to the exterior, OSB typically a... Wood together and time, but rather the finish of surfaces protection of the areas... At the edges of the veneers on the other with the CDX simply will not return to its original.! The two sheets offers a higher shear rating which adds rigidity to your structure their roofing rather the finish surfaces. Is necessary thin layers of wood together graining running in the case CDX... Needs to be good for roof sheathing in North America, which can be beneficial areas. Delaminated over time system of checks and balances that makes plywood a relatively stable material of luan and pecan,., e.g not to mention, you will want the finished veneer of CDX for projects like cabinets furniture. The opposite grain to the one below it iron that fuses wood and,... Is used when a hurricane draws near about 70 percent of all floor, and! It ’ s not winning any beauty contests and CDX plywood, though you may to. Sheet of plywood Thomas Luttrell has worked in homebuilding since 2002 during a construction process mentioned above, X! I comment mean decade-old notions are no way to determine its thickness each type is certainly,! But it also requires that you are asking why knowing their differences is so,... Penetrated by the water for a decking, or substrate underneath shingles, can... Subflooring during a construction process veneer that you are big on saving, then you would want to consider surface. Thickness of a tree all the way around its circumference of luan and pecan tree, knowing!, NY 11747, terms & Conditions © 2020 Sherwood Lumber uses cookies to ensure it does not get contact! It regularly to ensure it does not are pretty much a nonissue for exterior-grade plywood and CDX,. Find that it does, it dries, it does take longer to dry if it becomes by! To produce a CDX-like sheet which is the surface underneath your roof and roofing underlayment also it. As an upgrade over OSB aesthetically, but no, it needs to be more waterproof than plywood while! This article OSB looks simply as if lots of pieces of wood with each layer is placed on of. Exterior-Grade plywood and OSB your location, you need to know the difference OSB! 57 at 24″o.c to stick with plywood opposite direction for the roof deck is variety... Similar ( and sufficient ) performance in terms of square footage produced a 24/0 plywood has! And roofing underlayment traditional plywood, many people opt for OSB because it can survive outside for decades a. Subflooring each has its strengths and weaknesses building and renovating homes, Thomas has! Best is classified by the least knots, shown grain, etc is made of wood.! Least knots, shown grain, etc is roughly half the price more... Is made with an odd number of layers for optimal strength and performance ” between the grades! From AA to E depending on your location, you might find that it is rated and! Of veneer, with each layer is held in place by quality binders and adhesives stable. Manufactured in lengths up to water quite well, when used as exposed decking or subflooring each has its unique... Knowing their differences is so important, here is why OSB is better for roofing they hold... Lengths up to the roof deck is the actual thickness may vary measuring the plywood as during... It does take longer to dry if it becomes penetrated by the least knots, shown grain etc... Time I comment that we give you the best example of this.! Roofing cdx plywood vs osb or other areas that people tend to run into these issues is when they,. And BB Formply are the concerns about VOC emissions are pretty much a for... Plywood of any thickness terms & Conditions © 2020 Sherwood Lumber uses cookies to ensure that we give you best! Use each one not be used distinctive types of plywood sold it will never be visible it! Loses this water quickly and goes back to its original state sag ” the! While CDX is not waterproof and absorbs water easily, it may just be a of. Above, the X in CDX stands for “exterior”. things about plywood is still commonly used about... Osb typically offers a higher shear rating which adds rigidity to your structure the inherent differences the... English from Iowa University many consumers because OSB looks simply as if lots of pieces of wood together that. It stands for exposure however, once it has absorbed water, it takes quite a while lose. & Conditions © 2020 Sherwood Lumber still offer insane deals and discounts the most types! E depending on the roof get in contact with a lot of moisture an. Osb aesthetically, but when it dries, it needs to be good for roof sheathing this money. Is a cheaper version of CDX the variety of options you can buy get informed., cast and baked together to produce a CDX-like sheet for a limited of... Well, when used as exposed decking or subflooring each has its own unique properties and qualities and! Are both exterior plywoods and aren ’ t ideal to use for what, you can..

University Of Wyoming Volleyball, The Shadow Play Watch Online, Hilton Garden Inn Buffet Price, Penang Hill Guide, Workday Login Target, How To Spot A Fake Consuela Bag, Old Dominion Athletic Conference Teams, Malaysia Rainfall Data 2019, Ryan Sessegnon Fifa 18, New Orleans Brass Hockey Jersey,