Plywood subflooring also comes in 1/2-inch and 5/8-inch thicknesses. Construction adhesive is used between the joists and the subfloor but it does not measurably add to the thickness of the floor. The subfloor in my project house appears to be 1/2 OSB. Thinner subflooring may be suitable for carpet or resilient floorings, such as vinyl or linoleum, but thicker subflooring is recommended for nail-down hardwood and is required for floor tile. Here’s step-by-step guide to help you prep a concrete subfloor for luxury vinyl: Step 1: Test the moisture content of your concrete subfloor. Although using a subfloor adhesive is not required by code, it is a standard practice that can help prevent floor squeaks by reducing the chance for movement at the panel-to-joist connection. When installing DRICORE ® Subfloor R+ panels up to shower stalls or bathtubs, run a flexible caulking to seal the gap between the finished floor and the tub/shower unit in this area to prevent excessive moisture from seeping between the finished floor and DRICORE ® Subfloor R+ panels. Height: Yes, you can build a 12-inch high basement subfloor and stay dry above everything, but basement ceilings tend to be low. The answer: Glue. With ceramic tile, you also need to limit the deflection between joists, which is a function of the subfloor thickness and how it is installed. The cost is either shared, or one of the involved parties takes the biggest hit, which can be extremely damaging to any business. Use a digital moisture detector to measure the moisture content (MC) of the concrete slab. Brett Miller, vice president of certification and education at the National Wood Flooring Association, answers: First, let's get the recommendations straight. 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. What am I supposed to do? 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. Table 9.23.14.5.A. 1 | Ensure subfloor is structurally sound On existing structures: • Ensure subfloor is not damaged. Weather can play a major role in how well traditional cartridge-applied adhesives work. Subfloor Thickness or Rating (1) Except as provided in Sentences (2) and (3), subfloors shall conform to Table 9.23.14.5.A. Protect your floors from water damage by starting with the right subfloor products. Height: Yes, you can build a 12-inch high basement subfloor and stay dry above everything, but basement ceilings tend to be low. How many installers turn away the job because the builder refuses to pay for these corrections? Join the discussion. Maximum span 24 inches where 3 / 4 -inch wood finish flooring is installed at right angles to joists. With much of today's wood flooring being thinner, wider plank installed on the minimum building code panel thicknesses, we are seeing more creaks, pops and squeaks. Subfloor condition: The subfloor must be free of moisture damage, including rot and sponginess, and must be securely fastened to the joists and squeak-free. Construction adhesive is used between the joists and the subfloor but it does not measurably add to the thickness of the floor. ...See More. Code calculators automatically generate a detailed list of requirements. Subflooring only adds 3/4 inch to the floor thickness. 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. Continue to leave the 1/4″ spacing around the remaining perimeter edges as specified in our … Steel Screws The proper steel screw sizes for securing 3/4-inch plywood to the floor joists are #8, #10 and #12 screws.The number refers to the thickness of the screw.Each … View Subflooring Suppliers. Allowable live load values at spans of 16 inches on center and 24 inches on center taken from reference standard APA E30, APA Engineered Wood Construction Guide. As with many finish flooring materials, your subfloor may need 24 hours or more to acclimate to your home. When NWFA Guidelines minimums are not met, the recommendations are to overlay the existing subfloor material with a 1⁄2-inch panel product or add structural support from below. If the dead load exceeds 10 psf, then the live load shall be reduced accordingly. 3. The Ontario Building Code | Subfloor Thickness or Rating 9.23.14.5. 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. ESR-1785 is an Evaluation Services Report (ESR) issued by the International Code Council Evaluation Service. As with many finish flooring materials, your subfloor may need 24 hours or more to acclimate to your home. Subfloor thickness under carpet. So now, the only thing between me and my crawl space is 1/2 OSB. Subfloor holds up all of the above layers of flooring, as well as everything in your house—people, dogs, cats, pianos, furniture. Stagger subfloor panel end joints. Just so, what screws to use for subfloor? 2 ADVANTECH™ / SUBFLOOR ASSEMBLY ... Only 23/32 thickness AdvanTech ® flooring, and 1/2 and 5/8 thicknesses of AdvanTech roof and wall sheathing are included in ICC-ES report ESR-1785. It wasn't always like that. Very few! Standard Subfloor … Plywood continuous over two or more spans and face grain perpendicular to. The problem is, the builder will still build to the minimum standard, and the issue will arise again. Subfloor ventilation was 34% of the required level. Structurally sound concrete floors require that the gypsum underlayment meet a minimum compressive strength of 3.000 psi and be a minimum thickness of 1/2”. Always check your local building code before choosing a particular subflooring material or design. Continue with Google.   Stagger subfloor panel end joints. Designed for use as combination subfloor/ underlayment. The allowable total loads were determined using a dead load of 10 psf. A reliable and up-to-date source of codes. Typically made of plywood or OSB and ranging in thickness from 19/32" to 1 1/8" thick, the subfloor is truly structural, second only to joists in this respect. The code requires 1 1/4" floor thickness (overall) unless it is tongue and groove plywood in which case 3/4" is adequate. Subfloor holds up all of the above layers of flooring, as well as everything in your house—people, dogs, cats, pianos, furniture. 804.4.1 Subfloor construction 1406.2.4 Combustible exterior wall veneers 2111.11 and 2111.13 Fireplace clearances and fireblock requirements. The Performance Category value shall be used as the "nominal panel thickness" or "panel thickness" wherever referenced in this code. HiCustomerbr /> If you already have a 3/4 boards for a rough sub floor that is quite adequate and meets code requirements if you install 3/4 hardwood on top. In the end, if the consumer is not happy, someone will be left holding the cards. For joists spaced more than 19.2 inches on center, the minimum thickness for plywood is 7/8 inch and for OSB, 1 inch. Jump to Latest Follow 1 - 2 of 2 Posts. Minimum thickness should be 5/8” for plywood and 23/32” for OSB. But I doubt adding thickness to your subfloor is against code. Code is dependent on your location - state, county, city, municipality. This issue's tip is from Daniel Caffo at Daniel Caffo Hardwood Flooring Inc. in Woodlyn, Pa.We... One of the world's oldest cities has a new wood flooring trend. Replace any loose, warped, uneven or damaged sections of floor. 3. For joist spans 16 inches or less, NWFA recommends minimum panel thickness of 5⁄8-inch plywood or 23⁄32-inch OSB; the building code requires 5⁄8-inch plywood or OSB. Evaluation reports from ICC Evaluation Service are frequently used by code … The following is an overview of adhesives, applicators, fillers and finishes available today, featuring advertisers from the February/March issue of Wood Floor Business. thickness is needed for transition. Recoating and refinishing are some of the trickiest parts of the wood floor business; these articles offer help for products from newer floors to historic homes. Where used as subflooring or combination subfloor underlayment, wood structural panels shall be of one of the grades specified in Table R503.2.1.1(1). Panels continuous over two or more spans with long dimension (strength axis) perpendicular to, Lumber blocking, panel edge clips (one midway between each support, except two equally spaced between, Maximum span 24 inches where 1.5 inches of lightweight, Unsupported edges shall have tongue-and-groove joints or shall be supported with blocking unless minimum nominal, Unsupported edges shall have tongue-and-groove joints or shall be supported by blocking unless nominal. Use tongue-and-groove subfloor panels or install blocking beneath panel joints. See more on this topic: Subfloor/Slab Prep & Underlayment. Apply construction adhesive or caulk at panel seams and between subfloor panel and framing members. As with other engineered wood products, OSB comes in a range of thicknesses and styles, and it is important to make sure that the appropriate product is used. All … Restoration Guide: Sheathing, Subfloor and Underlayments. Both come in 4-by-8 sheets and feature tongue-and-groove installation. It's very unusual to have only half-inch subfloor. From the photo, it looks like you have some serious flatness issue goin' on. Always check your local building code before choosing a particular subflooring material or design. Miller has more than 21 years of experience in the hardwood flooring industry, most recently having worked as a regional manager at Basic Coatings. View Subflooring Suppliers. Pete Helton Jr. Why does NWFA have more stringent recommendations than the minimum building code? To glue or not to glue? Leverage the full code compliance platform. allowed on the grademark-specified thickness of 13/16-inch and less and ±5% of the grademark-specified thickness for panels thicker than 13/16-inch. Maximum span 24 inches for 15 / 32 -and 1 / 2 -inch panels. When installing DRICORE ® Subfloor R+ panels up to shower stalls or bathtubs, run a flexible caulking to seal the gap between the finished floor and the tub/shower unit in this area to prevent excessive moisture from seeping between the finished floor and DRICORE ® Subfloor R+ panels. Some mills also produce specialty sizes (e.g., smaller panels for the Japanese market or longer panels for vertical applications on walls, such as panels 4 feet wide by 9 or 10 feet long) If peaks or valleys in the subfloor exceed the tolerances specified above, sand down the high spots and fill the low spots with a leveling compound or other material approved for use under wood flooring. There are two main types of subflooring, plywood and oriented strand board, or OSB. They quoted code to add a 1/4 inch plywood or osb layer over the 7/16 osb and I would be good to go. Available in thicknesses of 1/4, 5/16, 11/32, 3/8, 25/64, 7/16, 29/64, 15/32, 1/2, 19/32, 5/8, 11/16, 23/32, 3/4, 7/8, 1, and 1-1/8 inch. Where sanded plywood is used as combination subfloor underlayment, the grade, bond classification, and Performance Category shall be as specified in Table R503.2.1.1(2). Projects provide a dedicated space to collaborate on code research. Rapidly and efficiently calculate project parameters. If you have been installing floors over these subflooring systems with success, maybe you don't need to change a thing! Refer to reference standard for allowable spans not listed in the table. I believe the code allows us to use a minimum of L/240 deflection for our floors joists. Trade associations (such as APA–The Engineered Wood Association) provide structural guidelines for meeting various code requirements. How to Adhere Your Subfloor Panels to Joists. The room where you plan to install your floors matters quite a bit too. The NWFA Installation Guidelines provide information on proper acclimation, subfloor guidelines and specifications, and installation guidelines. I would consider using 2x4 lumber ripped on a table saw to conform to the highs and lows and fastened on 16" centers. Save Share. Bringing out the best in hardwood floors. When these issues occur, who's to blame? If you have a concrete slab floor, the slab may be considered the subfloor. Residential codes require a minimum of 1-1/8" thickness for both the deck and subfloor. Full 8-foot tall basement ceilings in older homes are rare, with 7-footers more the norm. Quickly locate sections across your jurisdiction. Put together a plan and cost to achieve what is recommended and present it to the builder/homeowner. Get everyone on the same page and streamline code research. Subflooring only adds 3/4 inch to the floor thickness. Industry Leader in the Professional Floor Sanding Market, Manufacturing the Finest Hardwood Products Since 1947. Poured gypsum underlayments can solve subfloor issues such as out of flat and out of level, but they need to be installed per the manufacturer’s guidelines. If you have a concrete slab floor, the slab may be considered the subfloor. The thickness of subflooring depends on the spacing of your joists. Thinner subflooring may be suitable for carpet or resilient floorings, such as vinyl or linoleum, but thicker subflooring is recommended for nail-down hardwood and is required for floor tile. The labour costs are the same for 3/8" ply or 3/4" ply...the THICKNESS of the subfloor will depend on the THICKNESS of your floor! DIY and Subfloor Systems 2x4s and Plywood . If they install a second layer of wood underlayment (3/8″ plywood or thicker), the guys would use 1/4″ CBU on top. My dilemma is how to estimate the thickness of the thinset motar base between the ceramic tile and the concrete backer & from the concrete backer to the plywood. Install subfloor in panel widths that align with the framing (typically 16-, 20-, or 24-inches on-center). Moisture Levels . The thickness of subflooring depends on the spacing of your joists. As the subfloor in new construction, we have learned to live with it, but when remodeling or at any time you have a choice of products to use, choose plywood, not OSB. Proper acclimatization must be done prior to subfloor installation to achieve stable, long-lasting results. To avoid buckling, subfloor panels should be spaced with a 1/8-inch gap at all edges and ends to provide room for naturally occurring expansion. Plywood subflooring with a thickness of 5/8-inch or 3/4-inch is substantial for laminate flooring, though adding an underlayment of a thinner plywood provides additional support. Plywood and OSB are the two most common materials used for floor decking, and typically they are 5/8″ or 3/4″ thick. Even an inch or two in elevation for your subfloor will make a noticeable difference. For panels up to ¾” thick, use minimum 8d deformed shank nails or #8 screws. Kerf the back of the panels 1/2 the thickness of the material (3/8”) on a 12” x 12” grid. So what should you do? 1 - 2 of 2 Posts. Plies Layers Building Code Performance Categories 19/32 PERF CAT 20 o.c. Subfloor — A subfloor is selected for structural purposes and is the substrate ... Loading requirements for subfloors are normally set by various building codes on both local and national levels. However, it is the builder’s or general contractor’s responsibility to . Premium Partners From the photo, it looks like you have some serious flatness issue goin' on. Editor's Note: This is article 3 of 6 in Chapter 5: The Partitions, Ceilings, Walls, Stairs Guide of Old House Web Restoration Guide. Discussion Starter • #1 • Feb 9, 2009. Therefore, the … Chevron floors have had a recent... Everything from basics on running the big machine to detailed buffer techniques and more are in these wood floor sanding articles. This is the traditional method of … Brett Miller is the VP of certification and education at the National Wood Flooring Association, where he is responsible for the development, coordination, implementation and presentation of the NWFA’s technical training schools, workshops, and on-line training, as well as the NWFA’s certification program. Continue with Facebook. RELATED: Step by Step: Fixing an Uneven Wood Subfloor Before Wood Floors. It protects supports it so that your room can transform from a slab of concrete (or wood) into something more decorative and attractive. Even an inch or two in elevation for your subfloor will make a noticeable difference. Highlight differences between any two building codes. This guide was developed and edited for old homes from original materials in the U.S. Housing and Urban Development Rehab Guide. An OSB subfloor is a subfloor made from oriented strand board (OSB), a manufactured wood product. Here's what some of them said: Typically made of plywood or OSB and ranging in thickness from 19/32" to 1 1/8" thick, the subfloor is truly structural, second only to joists in this respect. Thickness of Subflooring="http://thehandyforce.com/flooring/" title ="Handyman flooring install Toronto">flooring Some mills also produce specialty sizes (e.g., smaller panels for the Japanese market or longer panels for vertical applications on walls, such as panels 4 feet wide by 9 or 10 feet long) Unpack the code through illustrations and descriptions. 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. 3/4" results in a quieter, more solid floor, and a better base for any tile. Work at it backwards...it is the easiest way to do it. A wood subfloor should be OSB or plywood of 3/4″ or thicker for a hardwood floor installation. For joist spans 16 inches or less, NWFA recommends minimum panel thickness of 5⁄8-inch plywood or 23⁄32-inch OSB; the building code requires 5⁄8-inch plywood or OSB. From straight-lay strip to parquet, herringbone and more, these articles offer the 411 on wood floor installation. We've got the details on plywood vs OSB and enhanced options in each. ALLOWABLE SPANS AND LOADS FOR WOOD STRUCTURAL PANELS FOR ROOF AND SUBFLOOR SHEATHING AND COMBINATION SUBFLOOR UNDERLAYMENTa, b, c. For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa. If your concrete subfloor was just poured, you’ll need to allow it to properly cure for a minimum of 60 days before your luxury vinyl flooring installation begins. allowed on the grademark-specified thickness of 13/16-inch and less and ±5% of the grademark-specified thickness for panels thicker than 13/16-inch. Tile over Wood Subfloor. Typically made of plywood or OSB and ranging in thickness from 19/32" to 1 1/8" thick, the subfloor is truly structural, second only to joists in this respect. To avoid buckling, subfloor panels should be spaced with a 1/8-inch gap at all edges and ends to provide room for naturally occurring expansion. I would consider using 2x4 lumber ripped on a table saw to conform to the highs and lows and fastened on 16" centers. 3. Here are nine common subfloor installation mistakes and how to prevent them: 1. Particle board and chipboard are unacceptable for solid hardwood installations, but may be used in an engineered flooring install. Is the subfloor rigid or strong enough to support your hardwood flooring? Don't lay tiles on a concrete slab with cracks that appear to be spreading or irregularities that prevent you from leveling it. Need help leveling section of subfloor for … Full 8-foot tall basement ceilings in older homes are rare, with 7-footers more the norm. Minimum thickness should be 5/8” for plywood and 23/32” for OSB. Code Calculators automatically generates a detailed list of requirements. 1,000 square feet in one room straight-laid 31/4, all walls are square and subfloor ... Like many homeowners, when the COVID-19 pandemic hit, Mark Whatley began finding things to update in his home. 15 Posts . It seems there is a subfloor then tile … R503.2.1.1 Subfloor and Combined Subfloor Underlayment Where used as subflooring or combination subfloor underlayment , wood structural panels shall be of one of the grades specified in Table R503.2.1.1(1) . • Make certain subfloor is a clean and flat surface. or 9.23.14.5.B. The tile store folks say to use a 1/2″ notched trowel to spread the thinset motar under the tile to the cement board and a 1/4″ … Both cost money and time and will likely exceed the traditional installation costs. It sounds like your joists are well within the acceptable limits of L/300, so your main concern is the deflection of the subfloor between joists. Figure out your FLOOR FIRST....and then use thick plywood to RAISE the height of your subfloor. So now, the only thing between me and my crawl space is 1/2 OSB. Residential codes require a minimum of 1-1/8" thickness for both the deck and subfloor. Your subfloor plays a crucial role in the long-term health of your laminate. 1 Reply 1 Participant Last post: Avramel … When joists are spaced 16-19.2 … Subfloor ventilation was 34% of the required level. or sign up with email About this Discussion. https://homeguides.sfgate.com/size-plywood-use-subfloor-99039.html ALLOWABLE SPANS FOR SANDED PLYWOOD COMBINATION SUBFLOOR UNDERLAYMENTa. The manufacturer, distributor, builder or installer? No. Subfloor — A subfloor is selected for structural purposes and is the substrate ... Loading requirements for subfloors are normally set by various building codes on both local and national levels. Adding ¼-inch plywood to 5/8-ply will give you a combined (nominal) thickness of 7/8 inch. Tweet. Both come in 4-by-8 sheets and feature tongue-and-groove installation. For thicker panels, use 10d deformed shank nails or #9 screws. OSB is often used for sheathing in floors and walls, and in some regions, it is the building material of choice. Leverage the most sophisticated code compliance platform. Typically made of plywood or OSB and ranging in thickness from 19/32" to 1 1/8" thick, the subfloor is truly structural, second only to joists in this respect. Thickness Span Rating Min. Apply construction adhesive or caulk at panel seams and between subfloor panel and framing members. There was a layer of 1/2 MDF on top of this, but it has all been removed. It is not uncommon to see a properly installed floor still exhibit these issues. Maximum span 24 inches where 1.5 inches of lightweight concrete or approved cellular concrete is placed over the subfloor. 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. How many flooring professionals are confident taking on the liability of adding bracing between the joists to increase the stability of the subflooring system for our wood floor? Improper spacing. Check with your building department. Wood Floor Trick of the Trade: Cutting Carpet Circles Without the Hassle, Wood Floor Trend Spotting: Chevron Blends Modern, Traditional in Athens, https://www.nortonabrasives.com/en-us/markets/floor-sanding?utm_source=Wood%20Floor%20Business, Q&A: Battling Building Code Subfloor Requirements for Wood Floors, Step by Step: Fixing an Uneven Wood Subfloor Before Wood Floors, 2021 Adhesives, Applicators, Fillers + Finishes Product Focus, Pandemic Results in Family Floor of Custom Inlays. Read the flooring manufacturer's guidelines for the product you plan to install, and pay particular attention to requirements as regards the … Also, be sure your measurements are correct. We … You need two layers for a subfloor. For joists spaced more than 19.2 inches on center, the minimum thickness for plywood is 7/8 inch and for OSB, 1 inch. Plywood subflooring also comes in 1/2-inch and 5/8-inch thicknesses. Generate a code sheet that integrates with your drawing set. Don't lay tiles on a concrete slab with cracks that appear to be spreading or irregularities that prevent you from leveling it. Install subfloor in panel widths that align with the framing (typically 16-, 20-, or 24-inches on-center). 4–3 0.563ʺ – 0.625ʺ (14.29mm – 15.88mm) 23/32 PERF CAT 24 o.c. Don't lay tiles on a concrete slab with cracks that appear to be spreading or irregularities that prevent you from leveling it. Trade associations (such as APA–The Engineered Wood Association) provide structural guidelines for meeting various code requirements. Bona US Bona R850T ... WFB asked its followers on Facebook and Instagram what their fantasy wood floor would be to install. When NWFA Guidelines minimums are not met, the recommendations are to overlay … Code aside, I would not accept a subfloor less than 3/4 inch, and ideally screwed into the joists to avoid squeaking over the long term. If they decline to compensate you for the additional work necessary, it is up to you to determine if the work is worth the potential liability. Code is relevant only to your location. Subfloor panels are commonly marked with … Subfloor holds up all of the above layers of flooring, as well as everything in your house—people, dogs, cats, pianos, furniture. A quality subfloor adhesive will also increase the overall stiffness of the floor. Shannon Lee. There was a layer of 1/2 MDF on top of this, but it has all been removed. Check your local building code, and pay special attention to rules concerning vapor barriers, span ratings (subfloor thickness) and floor drains. Adhesives The building code for the subfloor is to ensure structural loads are adequate—from a safety perspective, not necessarily from a wood flooring performance perspective. Reply. Usually it is 5/8 or 3/4" and the panels have a tongue & groove on the long side. Here are nine common subfloor installation mistakes and how to prevent them: 1. 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. Although using a subfloor adhesive is not required by code, it is a standard practice that can help prevent floor squeaks by reducing the chance of movement at the panel-to-joist connection. sheathing and subfloor. ICC Digital Codes is the largest provider of model codes, custom codes and standards used worldwide to construct safe, sustainable, affordable and resilient structures. ver filme online grátis. 5. DIY and Subfloor Systems 2x4s and Plywood . 15 Posts . 804.4.1 Subfloor construction 1406.2.4 Combustible exterior wall veneers 2111.11 and 2111.13 Fireplace clearances and fireblock requirements. Typically made of plywood or OSB and ranging in thickness from 19/32" to 1 1/8" thick, the subfloor is truly structural, second only to joists in this respect. National Wood Flooring Association approves usage of OSB as a subfloor for hardwood flooring with nail-down installation with minimum thickness of 23/32″ and recommended thickness of 7/8″ or 1-1/8″. Use tongue-and-groove subfloor panels or install blocking beneath panel joints. the subfloors need to be thicker. Being a wood floor pro—the production manager for Amber Flooring in Emeryville, Calif.—he decided his home ... Why Would an Existing Wood Floor Cup After Refinishing? Before you lay a single plank, you need to make sure that your subfloor is up to the task of providing your new laminate flooring a good home. Use a minimum 3/4” (23/32, 18.3 mm) subfloor panel cut to smaller 2’ x 8’ or 4’ x 4’ sections. Don't miss relevant code. • For extra protection against floor noise, apply a 1/8” thick line of adhesive to the groove of the fastened panel before inserting the … It wasn't always like that. Click to see full answer. Discussion Starter • #1 • Feb 9, 2009. Improper spacing. I believe the code allows us to use a minimum of L/240 deflection for our floors joists. 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. R503.2.1.1 Subfloor and Combined Subfloor Underlayment, R503.2.1.1 Floors, Subfloor and Combined Subfloor Underlayment, R503.2 Floors, Wood Structural Panel Sheathing. mobile home subfloor thickness | Uncategorized | mobile home subfloor thickness. There are two main types of subflooring, plywood and oriented strand board, or OSB. the subfloors need to be thicker. 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. … My subfloor is 3/4″ OSB Structurewood which I will be covering with plywood. The subfloor in my project house appears to be 1/2 OSB. Very few! 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. In this scenario, Jim and Rich install 1/2″ cementious backer unit (CBU) resulting in at least an 1-1/8″ thick subfloor. As the subfloor in new construction, we have learned to live with it, but when remodeling or at any time you have a choice of products to use, choose plywood, not OSB. … But that one hit can quickly turn production income into a nightmare job.
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