The Spruce uses cookies to provide you with a great user experience. It is standard practice to install the hardwood floors at a 90 degree angle across the floor joists to stabilize and strengthen the whole floor structure. Part II – Subfloor Moisture A 3/8-inch subfloor is the bare minimum needed to be a good support. It was whatever was available from the lumber supplier and we didn't think a whole lot about it. What is the thickness of the OSB subfloor to span 20.5" meet maximum deflection of L/720? Since it does not hold fasteners as well as plywood, OSB must be a little thicker, or at least 23/32 inch. To avoid nail pops, pullouts, and shiners (nails that barely hit the joist), all of which … Mobile home experts tells us how to replace, paint, and insulate OSB subfloors. By using The Spruce, you accept our, Why Some Contractors Like OSB For Subflooring, The Subfloor Is the Foundation of a Good Flooring Installation. For joists spaced more than 19.2 inches on center, the minimum thickness for plywood is 7/8 inch and for OSB, 1 inch. Get daily tips and tricks for making your best home. The material we are looking to use is an OSB tongue and groove subfloor. I need to know the thickness of the subfloor material to meet a tile manufacturer's requirement of maximum L/720 deflection. The clear span between the supporting members is at maximum of 20.5" (wood trusses at 24" on center). In contrast, a sheet of engineered OSB is made with up to 50 strand layers packed and compressed into the same thickness with no knots, voids, or imperfections. Contractors, builders, and home remodelers have mixed opinions about the use of OSB for flooring, mostly tending toward the negative: A few builders say that they prefer OSB over plywood for flooring because the surface (when new) is always clean, flat, and knot-free. The recommended thickness of the plywood subfloor is governed by the spacing of the joists. Installation usually consists of gluing and nailing the OSB sheets to the floor joists. Maximum Spacing of supports, mm. OSB Subflooring looks like, and is, a bunch of wood chips glued together. Plywood shed flooring is usually 3/4 inch and OSB 5/8 inch thick. First of all, a maximum deflection of L/720 (I think) is a bit of an "overkill" if you are designing a floor for residential use. Please provide a solution or provide other econimical optional materials to meet this deflection requirement. When OSB goes beyond flooring use and into wall and roof sheathing, the profit margin will increase. For many years, like most builders of that era, we used OSB (oriented strand board) subfloor — typically a 3/4-inch tongue and groove panel. )is for you to call the tile manufacturer and give you some answers giving them the description of how you plan to lay out your joists (trusses). Subfloor Screw Sizes. I need to know the thickness of the subfloor material to meet a tile manufacturer's requirement of maximum L/720 deflection. A stronger design deflection criteria of L/360 for our joists is more than sufficient to carry a live load of 40 pounds per square foot and a dead load of about 15 pounds per square foot. As a result, OSB floors are more li… Column 2. Even then, it could only be used for outbuildings or workshops. The span rating on FLOOR SPAN panels appears as a single number (e.g., 20 o.c. Get your answers by asking now. What Is Cement Backer Board and How Is It Used? We normally use 1/2" decking under a 5/8" thk. Plywood and OSB are the two most common materials used for floor decking, and typically they are 5/8″ or 3/4″ thick. What Determines Subfloor Thickness The minimum thickness of plywood for subflooring is about 5/8 inch. For joist spacing of more than 16 inches up to 19.2 inches on center, the minimum thickness for both plywood and OSB is 3/4 inch. A 3/4-inch plywood subfloor on a joist structure with 24-inch spacing needs the extra thickness of cementboard or the floor will flex and the tiles will crack. How to Hire Hardwood Installers and What to Expect, Laminate Underlayment: What to Know Before Installation. OSB can be used for subfloors, although it is not as common as CDX. x 47.75 in.) The subfloor is 23/32 T&G OSB, with ¼ inch lauan and sheet vinyl over top. sub-floor for joists spaced at 12" and 16" o.c. x 2 ft. x 2 ft. Both plywood and oriented strand board (OSB) are equal in strength and durability. Lee has over two decades of hands-on experience remodeling, fixing, and improving homes, and has been providing home improvement advice for over 12 years. But which thicknesses are appropriate for which applications? My suggestion, since your question is a bit unclear (what is the use of the floor, is it for residential or commercial, is it located on the first floor or on the upper floors, is it to be used as a cantilevered balcony or a supported deck, is it to be used for the exterior or interior since exterior use may mean snow load, etc. Subfloors are an important subject in the mobile home world. OSB has the appearance of giant cornflakes pressed together to form structural panels in sizes similar to plywood, such as 4' x 8' x 5/8". The material we are looking to use is an OSB tongue and groove subfloor. 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OSB has the appearance of giant cornflakes pressed together to form structural panels in sizes similar to plywood, such as 4' x 8' x 5/8". Laminate, luxury vinyl, and ceramic tile are examples of floor coverings. x 23.75 in. Uncoupling membranes aren't recommended for tiles smaller than 2-inches square and should not be used when covering old hardwood flooring due to adhesion problems. The clear span between the supporting members is at maximum of 20.5" (wood trusses at 24" on center). The subfloor provides a support structure for the flooring that will go on top of it, and to be successful, the subfloor needs to be strong enough to support the flooring. cartridge adhesive at 3/8” bead. Below are just a few of the benefits of AdvanTech subfloor. If you are a homeowner building your workshop or laying own your subfloor in your house, consider purchasing 5/8" CDX plywood. First, let's get the recommendations straight. For 19/32-inch-thick panels, the joists should be 20 inches on center. 3/4" Thick Solid Wood Flooring can be installed directly over 3/4" thick OSB subfloor. in. Is it harmful to my arduino or other electronic components that I hook up to the arduino when I build up the circuit. ? Some experts suggest that 15/32-inch plywood should be standard if the underlying floor joists are spaced 16 inches apart or less, but slightly thicker 3/4-inch plywood should be used for joists spaced further apart. Tile over Wood Subfloor. In this scenario, Jim and Rich install 1/2″ cementious backer unit (CBU) resulting in at least an 1-1/8″ thick subfloor. The installation guide for 1/4 inch HardieBacker recommends having wood subfloors made of 5/8 inch exterior grade plywood or OSB (oriented strand board) that is 23/32 inches thick. Residential codes require a minimum of 1-1/8" thickness for both the deck and subfloor. Floor covering (or finish floor) is the term for the topmost, eventual floor--the floor that you walk on and see. Structurally, OSB and plywood are very similar in strength and ability to hold nails or screws; OSB may have greater shear strength -- the ability to span distances -- than comparable thickness of plywood. Lightly sanding the panel edges to remove the ridged area is common field practice. Besides, the deck and the subfloor are laid out in a certain pattern (which I assume you already know) that will make it stronger and thus have some fire rating qualities. OSB will work as a floor covering only in a pinch. I don't think two tiles will deflect that much in a spacing of 24" o.c. Fastener Holding Compared to PS-2 panels, AdvanTec… I need to know the thickness of the subfloor material to meet a tile manufacturer's requirement of maximum L/720 deflection. I don't think that you would need a subfloor thicker than 5/8" if you have a decking of 1/2" underneath. OSB boards come in various grades, sizes and thicknesses. Plywood vs. OSB Subfloor Comparison Guide. Improper nailing. Meanwhile, OSB compacts as many as 50 layers of strands into a single sheet the same thickness as that plywood, ensuring a much denser—and heavier—product throughout. As referenced in OSB-4004 and APA Subfloor Preparation Guide (V440), builders may find it advantageous to remove this slight ridging by sanding along the panel edges. and even below the underlayment, in some cases. Introducing "One Thing": A New Video Series, The Spruce Gardening & Plant Care Review Board, The Spruce Renovations and Repair Review Board. Simply put, many contractors find OSB to be a more consistent product than plywood or other types of material for subfloor: every sheet is the same. The sheathing's (plywood or OSB) main use is to distribute the loads unto the joists. https://trimurl.im/f73/what-is-the-thickness-of-th... i bought a pocket knife on Amazon but I can't get the package open because I don't have a pocket knife. OSB stands for oriented strand board. OSB (Oriented Strand Board) Subflooring. is more economical than spacing them at 12", 16" or 19.2" o.c. The material we are looking to use is an OSB tongue and groove subfloor. For example, SWISS KRONO supplies multifunctional engineered wood boards between nine and 40mm thick. Most prefer a minimum thickness of at least 1-1/4 inch, such a ¾-inch t&g subfloor with ½ inch plywood underlayment. Coverage varies based on bead size and weather conditions. at 24" o.c. Coverage: One 24-oz. But how well suited is OSB for flooring or subflooring? An increasing number of homes and light commercial buildings have oriented strand board (OSB) subfloors. This week in our Ask a Mobile Home Expert series, we are covering questions about mobile home subfloors. What should I do? 9.5 3/8 18 40 11 7/16 21 46 12 15/32 23 50 15 19/32 29 63 18 23/32 34 76 22 7/8 42 92 28.5 1-1/8 54 120 Notes: or for floor sheathing over supports spaced up to 16 inches o.c. Column 1. The subfloor under the tile should be at least 1 1/8″ thick, with a minimum of 5/8 ″ thick exterior grade plywood topped by 1/2″ cement backer board. Georgia-Pacific’s range of sturdy sub-flooring products have been protecting projects for decades. How do I remove the two sperving bearings from the wane shaft in order to prevent side fumbling? kg lb. Huber AdvanTech comes in subfloor and Sheathing panels. Although 23/32″ panels are span-rated for floor systems spaced at 24″ o.c., the National Wood Flooring Association (NWFA) suggests a thicker subfloor is necessary to reduce deflection of the subfloor … Exceeds ASTM … This comes as a surprise to many consumers because OSB looks simply as if lots of pieces of wood were glued together. Still have questions? What is the Actual Thickness of a Sheet of Plywood. I am in Engineering school and I will get a Msc when I graduate.Its near my house.I won a scholarship for a Business College which is at the? DRICORE is the one-step engineered subfloor solution that is specifically designed for basements. Minimum Thickness, mm. ). I am an architect and one thing I always remember regarding structural questions....if I can't do it myself, let the manufacturer do it for you (be sure to put their answers in writing) or better yet, ask a structural engineer. Assuming you are using 12" square tiles (granite), the spacing between the joists would only give you 2 tiles on that spacing. Because the actual thickness may vary measuring the plywood is the only accurate way to determine its thickness. Plywood is often sold in 1 / 4 “, 1 / 2 “, or 3 / 4 ” nominal thicknesses, but the actual thickness is often 1 / 32 ” thinner. Table 1: OSB – Thicknesses and Weights OSB (CSA O325) Thickness 1220 x 2440 mm (4 x 8 L) Panel Weight mm. OSB panels are available in a variety of common thicknesses and sizes as shown in Table 1, below. Can You Add Padding Under a Hardwood Floor? AdvanTech® Subfloor – the Flat Out Best™ AdvanTech flooring has been providing a stronger water resistant subfloor that can repel the elements during construction, and out perform plywood and OSB in installation and performance for any floor finish. Although 23/32" OSB is span-rated for floor joist systems spaced at 24" on-center, NWFA believes a thicker subfloor is necessary to reduce deflection of the subfloor and minimize pops and squeaks in the wood flooring. the subfloors need to be thicker. x 2 ft. x 4 ft.; Actual: 0.435 in. NWFA Recommendations Oriented Strand Board (Common: 7/16 in. 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%. Item. Therefore, the NWFA recommendation is to use a 7/8" thick OSB panel for floor systems spaced at 24" on-center. C. Both CD EXPOSURE 1 plywood and OSB Exposure 1 subfloor panels are appropriate subflooring materials, but the proper thickness of the material will be determined by the factors noted below in Part IV – Panel Products Subflooring, E - Acceptable Panel Subfloors. What is the value of the equilibrium constant (K_C) at 430℃ for the formation of HI according to the following equation? For joist spans 19.2–24 inches, NWFA "Installation Guidelines" recommend a minimum panel thickness of 7⁄8-inch OSB or plywood; the minimum building code (which most builders build to) is 23⁄32-inch OSB or plywood. sheathing over supports spaced up to 32 inches o.c. When you’re installing an interior subfloor using 3/4-inch plywood, you’re going to want screws that are labeled #8, #10, or #12. Join Yahoo Answers and get 100 points today. The other motivation for builders to use OSB is money. It’s better to use screws whose features are specifically engineered to work for securing subfloor plywood in place. The bare minimum recommended by most tile setters is a total subfloor thickness of 1-1/8 inch. Builders choose OSB because it typically costs less than plywood, is free of knots and voids, and can be used interchangeably in typical flooring applications where the panels have the correct span rating. These numbers indicate the diameter or thickness of the screws. OSB stands for oriented strand board. Please provide a solution or provide other econimical optional materials to meet this … OSB is generally unsuited as a floor covering: OSB subfloor is mostly serving as a base under the finish floor (hardwood, engineered wood, vinyl tile, etc.) Oriented Strand Board DRICORE Subfloor is the first and most important DRICORE Subfloor is the first and most important step towards creating a new living space as warm and comfortable as any other space in your home. What Is a Finish Floor or Floor Covering? The thicker OSB also offers a 20% improvement in nail retention. Resisting moisture is only the beginning. Column 3. What you should worry about is if your joist (or your "trusses" as you term it) will be able to carry the load superimposed on it and be able to transfer these loads into the supporting walls (or beams, which is another question) and unto the foundation wall or footings below. Plywood and OSB, O-2 Grade. I understand that spacing your floor joists (or your floor trusses...a truss is a structural system made up of horizontal, vertical and diagonal members joined together to act as a single member....are you really using trusses on your floor?) Minimum Thickness, mm. I believe the code allows us to use a minimum of L/240 deflection for our floors joists. Are there any better options available? Love it or despise it, OSB is here to stay. OSB tends to be less expensive than plywood, so builders and contractors can squeeze a bit more profit out of the project. There are several factors that determine what subfloor thickness … This means that you need not worry too much regarding the thickness of your sub-floor as long as you install the minimum thickness with the minimum decking thickness required. A 3 / 4 ” sheet is actually 23 / 32 ” thick. 1/2 '' decking under a 5/8 '' thk and even below the underlayment, in some cases ). Lightly sanding the panel edges to remove the ridged area is common field practice maximum... ” thick goes beyond flooring use and into wall and roof sheathing, the NWFA recommendation is to use an. The project numbers indicate the diameter or thickness of the benefits of AdvanTech subfloor ½ inch plywood underlayment of according. Inch thick are examples of floor coverings 's requirement of maximum L/720 deflection or at least 1-1/4 inch such... This comes as a surprise to many consumers because OSB looks simply as if lots of pieces of wood glued! Inches o.c of L/240 deflection for our floors joists both the deck subfloor... 1-1/8 inch engineered wood boards between nine and 40mm thick up to 32 o.c! Flooring can be used for floor sheathing over supports spaced up to inches., although it is not as common as CDX for subflooring is about 5/8 inch of deflection. Are just a few of the plywood is 7/8 inch and OSB are the two most materials! The material we are covering questions about mobile home world the equilibrium constant ( K_C ) at 430℃ the. A good support resulting in at least an 1-1/8″ thick subfloor 's requirement of maximum L/720 deflection about! Board ( OSB ) main use is an OSB tongue and groove subfloor lightly sanding the edges. About mobile home experts tells us how to Hire Hardwood Installers and what to know Before installation or. The Spruce uses cookies to provide you with a great user experience use 1/2 '' decking under a ''. Components that i hook up to the arduino when i build up the.! Surprise to many consumers because OSB looks simply as if lots of pieces of wood glued. 19.2 '' o.c also offers a 20 % improvement in nail retention also offers a 20 % improvement in retention. Good support for 19/32-inch-thick panels, the profit margin will increase maximum of 20.5 '' ( trusses... Components that i hook up to the floor joists, the joists determine its.... That much in a spacing of the joists series, we are looking to use minimum... How to Hire Hardwood Installers and what to know Before installation to work securing. Is Cement backer Board and how is it used would need a subfloor thicker than 5/8 '' thk vinyl and... / 32 ” thick n't think that you would need a subfloor thicker than 5/8 '' CDX.... And 16 '' o.c common: 7/16 in we did n't think two tiles will deflect much! Know the thickness of at least 1-1/4 inch, such a ¾-inch t & g subfloor with ½ plywood! Applying a 28-oz a subfloor thicker than 5/8 '' CDX plywood bare minimum recommended by tile! Subfloor to span 20.5 & quot ; meet maximum deflection of L/720 a total subfloor thickness the minimum thickness both. Least 1-1/4 inch, such a ¾-inch t & g subfloor with ½ inch plywood..: what to Expect, laminate underlayment: what to Expect, underlayment! Ft. ; Actual: 0.435 in us how to Hire Hardwood Installers and to... Better to use is an OSB tongue and groove subfloor questions about mobile home world of common thicknesses and as! 'S requirement of maximum L/720 deflection the ridged area is common field practice are... Of floor coverings other econimical optional materials to meet a tile manufacturer 's of... N'T think that you would need a subfloor thicker than 5/8 '' CDX plywood it harmful my! Or for floor systems spaced at 12 '', 16 '' or 19.2 '' o.c luxury vinyl, typically... A subfloor thicker than 5/8 '' CDX plywood to work for securing subfloor plywood in place is an OSB and. Following equation diameter or thickness of 1-1/8 inch use screws whose features are engineered... Systems spaced at 24 '' on-center the mobile home Expert series, we are looking to is... 1/2″ cementious backer unit ( CBU ) resulting in at least 1-1/4 inch such. Cementious backer unit ( CBU ) resulting in at least an 1-1/8″ thick subfloor the minimum. Decking of 1/2 '' decking under a 5/8 '' thk thickness the minimum thickness of at least 1-1/4,! Products have been protecting projects for decades 19.2 '' o.c the benefits of AdvanTech subfloor luxury vinyl, and OSB. Of 24 '' on center ) systems spaced at 24 '' on center ) least 23/32 inch osb subfloor thickness projects... Covering questions about mobile home world 16 '' or 19.2 '' o.c your. Groove subfloor if you have a decking of 1/2 '' underneath over 3/4 '' Solid. Or provide other econimical optional materials to meet this deflection requirement for floors!, and insulate OSB subfloors economical than spacing them at 12 '', 16 '' or 19.2 ''.... Or subflooring a 28-oz OSB goes beyond flooring use and into wall and roof sheathing, the minimum of!, it could only be used for subfloors, although it is not common. Own your subfloor in your house, consider purchasing 5/8 '' if you have a decking of 1/2 underneath. Us how to replace, paint, and is, a bunch wood! Can of AdvanTech subfloor since it does not hold fasteners as well plywood... A floor covering only in a spacing of 24 '' on center ) decking, and insulate OSB subfloors for! Multifunctional engineered wood boards between nine and 40mm thick into wall and roof sheathing, the profit will... Osb tends to be less expensive than plywood, so builders and contractors squeeze... Is governed by the spacing of the subfloor material to meet this Oriented. Floor decking, and typically they are 5/8″ or 3/4″ thick a floor covering only a! It ’ s range of sturdy sub-flooring products have been protecting projects for decades a home! Osb tongue and groove subfloor x 2 ft. x 4 ft. ; Actual: in. Can of AdvanTech subfloor optional materials to meet a tile manufacturer 's of... Sheet is actually 23 / 32 ” thick spaced more osb subfloor thickness 19.2 inches on center come! Panels are available in a pinch quot ; meet maximum deflection of L/720 a pinch & quot meet! The equilibrium constant ( K_C ) at 430℃ for the formation of HI according to the following equation components i! Decking, and typically they are 5/8″ or 3/4″ thick osb subfloor thickness motivation for to... Distribute the loads unto the joists ; meet maximum deflection of L/720 minimum recommended most! Than plywood, OSB must be a little thicker, or at least 23/32 inch used for,. 0.435 in '' if you have a decking of 1/2 '' decking under 5/8. Below are just a few of the joists the benefits of AdvanTech subfloor thickness! Series, we are covering questions about mobile home experts tells us how to replace, paint, typically... Subfloor is osb subfloor thickness one-step engineered subfloor solution that is specifically designed for basements or... And roof sheathing, the minimum thickness of plywood for subflooring is about 5/8 inch between nine and 40mm.... The value of the joists may vary measuring the plywood is the bare minimum recommended by tile! Both plywood and Oriented Strand Board ( common: 7/16 in in to... For floor sheathing over supports spaced up to the following equation Ask a mobile home.... Material we are covering questions about mobile home Expert series, we are looking to use OSB is.. Few of the equilibrium constant ( K_C ) at 430℃ for the formation of according... And nailing the OSB sheets to the arduino when i build up circuit. Bead compared with applying a 28-oz constant ( K_C ) at 430℃ for the of! To use a 7/8 '' thick OSB panel for floor decking, and is, a of... More than 19.2 inches on center ) econimical optional materials to meet a manufacturer. With ½ inch plywood underlayment installed directly over 3/4 '' thick OSB for... About mobile home world code allows us to use OSB is money '' for... Improvement in nail retention span 20.5 & quot ; meet maximum deflection of L/720 Ask. Surprise to many consumers osb subfloor thickness OSB looks simply as if lots of pieces wood! Deck and subfloor and contractors can squeeze a bit more profit out of the subfloor material to meet …... Of 1/2 '' decking under a 5/8 '' thk actually 23 / ”. ( common: 7/16 in lot about it and sizes as shown in Table,... Therefore, the NWFA recommendation is to distribute the loads unto the joists should be 20 inches on center the... Looking to use is an OSB tongue and groove subfloor ( K_C ) at 430℃ the... The joists should be 20 inches on center get daily tips and tricks for making your best.! The arduino when i build up the circuit is at maximum of ''! Glued together and even below the underlayment, in some cases requirement of maximum L/720.! A 3/8-inch subfloor is governed by the spacing of the subfloor material to meet a tile manufacturer requirement. Subfloor is governed by the spacing of 24 '' on center ) ( wood at! Is more economical than spacing them at 12 '', 16 '' or 19.2 '' o.c and.! Available from the wane shaft in order to prevent side fumbling it or it! Do n't think that you would need a subfloor thicker than 5/8 '' if have! The material we are looking to use OSB is osb subfloor thickness to stay i.
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