Cement board over osb

Cement board over osb. Clean the subfloors well. (23/32 t&g osb on 2x12s 16 in Siding options that perform well in impact tests include steel metal panels, fiber cement siding, wood composites, masonry and brick walls, and brick and stone veneer walls, provided the siding materials are installed over OSB or plywood sheathing (Peters and Robertson 2012; Bennett et al. While it provides excellent protection against moisture, it is heavier and more challenging to install than OSB. One, you can use RedGard, preferably the uncoupling mat, to absorb the stress in the plywood and prevent it from spreading to the tiles. Cover an area just large enough for the first cement board sheet. Repeat the process. floor joists, 3/4” tongue-and-groove Apr 25, 2007 · weekendbuilder | Posted in General Discussion on April 25, 2007 11:32am. This is an extremely detailed and comprehensive tutorial that will take you step Oct 23, 2008 · OSB to durock install. The cross-oriented layers create an extremely durable panel that will not warp or bow. In this comprehensive guide, we will explore the process of installing metal roofing over OSB, covering important considerations, preparation steps, and best practices to ensure a successful and long-lasting installation. Only 1/4-inch cement board can be used on walls if there is a minimum of 5/8-inch exterior-grade plywood sheathing or an Oriented Strand Board (OSB) subfloor. Apr 10, 2023 · Paint the OSB: Apply a second coat of paint to the primed OSB. The top and bottom 25% of the sheet has its strands orientated to run the length of the sheet and the middle 50% has been orientated to run the width of the sheet. Jul 6, 2022 · Cement Board. To answer the question as posted: To affix OSB, you just need wood screws. It is fire-resistant, affordable, and low-maintenance. Seal the MDF 24 hours before tiling. Be careful to apply a very even layer of the primer and then let it dry. -thick engineered flooring. The span is 14ft each side of the supported centerline. com. We are building a seasonal home in Northern Michigan (therefore it will be subject to lots of freezing/thawing). Step 1 – Clean Up the OSB Floor. When applying the next coat, let the previous one completely dry. HardieBacker Cement Boa Joists bounce under load, bow when the temperature or humidity changes, and houses settle. Then you can apply a thin layer of KERDI-FIX to the board, the membrane over top Feb 10, 2023 · Stucco Without Sheathing (An In-Depth Guide) Stucco is undeniably one of the most durable and attractive finishes you can have on your exterior walls. 4 Fill gaps between panels and corners with a thin-set mor-tar, then embed 2" wide fiberglass mesh tape and smooth. What outer cladding substrate would be appropriate (over the rain screen) for my stone veneer. Fill any gaps on the surface and make it flat and smooth for the adhesive to work effectively. OSB is an engineered panel product and is one of the most wide spread panels used in the world. Mark a The problem is that half of the surface ( which has nothing underneath but ground,) is concrete, and the other half ( which goes over the basement) is usual wood construction consisting of 2x8 joists + 3/4" OSB, which I'm reinforcing with 1/2" plywood and 1/4" cement-board. It can be applied directly over old substrate on countertops to save time. Sep 28, 2021 · Better Resistance to Moisture: More Stable and Less Likely to Warp: Easier to Work With and Install: Provides a Smooth and Flat Surface for Finished Flooring: Benefits of Using OSB Subfloor. Currently we are putting ceramic tile in our mud room and bathroom. Have to read through the specs on it. Sheets are assembled in cross-oriented layers, similar to plywood. Torx is not a type of screw, it's a type of screw head, as in flat, phillips, etc. A cement board may be a suitable choice for homeowners seeking maximum moisture resistance. Comes in 4′ x 8′ OR 3′ x 5′ sheets. The sub-floor now has a few seams. 2” o. Find tech docs. Space Dec 8, 2012 · ceramic tile over OSB. May 12, 2022 at 18:25. May 16, 2023 · Jump to category: 1. It is important that the new height of the subfloor is higher than any of the existing high spots in the floor. Broadcast the primer with 30-mesh sand and let the E02 cure. 578 actual. Dec 29, 2015 · I am thinking Kerdi shower system over cement board is the way to go (per your article), but cement board is a beast for the DIYer. Apr 27, 2021 · To keep your porcelain or ceramic tile as clean as possible, as previously discussed, the grout that you use for your tile needs to be sealed. Heavy. Jun 6, 2023 · Step 2: Apply the Primer. Sep 9, 2022 · RedGard vs Cement Backer Board. Below are each of these steps in detail. (6 mm) cement board is used, 1/2 in. I have used backer on OSB many times, I like to use thin set to the floor for a rock solid base but with OSB I use mastic, it has to dry for Jan 30, 2023 · If you have any obstructions to work around, cut the cement backer board either with a utility knife or with a jigsaw fitted with a carbide blade. Utility knife: When using a utility knife, also use a metal straightedge and score a line on top of the board. Plywood has good moisture resistance and dries fast. Although, manufacturers' data sheets for both types of May 2, 2008 · "Mosture Blocker" is the functioning phrase, which isn't mentioned in the pamphlet. Is typically 1/4″ or 1/2 in thickness. Apply Type 1 organic adhesive with 5/32" v-notched trowel, latex-fortified mortar with 1/4" square-notched trowel. Finish Paint – 250-400 square feet per gallon. USG Corporation: Durock Durock does not expressly exclude concrete, but the material is specified only for minimum 5/8-inch exterior-grade plywood or OSB applied over wood or steel Aug 13, 2014 · We have the cement board all cut and ready to lay over osb. You should first know the height that you want your subfloor to be mark this area off. The next step here is to simply apply the primer using either a paint roller or a paintbrush. Walk gently on the panels to set them into the thin-set. Place a glob of plaster on the trowel, then smooth the plaster glob out from the center until the plaster is flat and even. As well as videos to show the entire process from start to finish. Explore our comprehensive toolkit designed to empower your expertise, drive success, and elevate your projects. Up to 50 layers of strands are compressed under high pressure to form OSB. Moisture isn't a problem because you have to apply a primer to the OSB before pouring, and that primer seals it. Use 1 5/8-inch screws for 1/2-inch backer board. Dec 6, 2018 · This is typically to lay it down and use 1/4 inch crown staples, 1 inch long, every 6 inches along the perimeter and 8 inches in the field. I'd hate for all that tile to crack because the osb swelled up and became mushy. OSB is available in sizes up to 8 feet wide and 16 foot long. The main level subfloor joists are older 2x10 solid lumber @ 16"oc with new 3/4 T&G OSB cover. We just read the article in Fine Homebuilding No. Then you can put down ditra, or cement board, then tile. The barn-style doors allow lots of ventilation. There are no unique issues with installing stone veneer over OSB, and the same method for applying stone veneer over the other recommended materials can be used for OSB. May 28, 2023 · Mix and Apply the Mortar. base coat. Once it’s laid on, grab a notched trowel and make vertical or horizontal grooves on the scratch coat. And then cement board from the mud pan up. I went back to Lowe’s and picked up DUROCK cement backer board instead, plus thinset, the proper screws, and alkali-resistant fiberglass mesh tape. You can use a washable marker to draw the lines on your linoleum. The most commonly used flame-spread classifications are: Class I or A, with a 0-25 FSR; Class II or B with a 26-75 FSR; and Class III or C with a 76-200 FSR. that is used as the substrate for ceramic and stone tile installations. Hardie board is installed over a plywood or OSB base for floors, counter tops or any horizontal surface and applied to vertical wall framing over water The resulting flame spread rating (FSR) is expressed as a number on a continuous scale where inorganic reinforced cement board is 0 and red oak is 100. Oct 19, 2022 · Alternatively, lay down a sheet of heavy paper over the floor area you intend to cover with linoleum. FLOORS AND COUNTERS. My plan is to use a liquid-applied WRB (likely StoGuard EmeraldCoat or GoldCoat), and paint over that directly with exterior Jul 18, 2023 · 3. The James Hardie Pros Hub is your destination for professional resources and expert insights. Note: Because cement board fasteners may protrude through the plywood base when 1/4" cement board is used, 1/2" or 5/8" cement board is preferred in this . Expansion Joint Recommendations installation of panels over 12’ long is not recommended PANEL SIZE 4X8 4X9 4X10 4X12 Space between panels and wall fixtures 1/8” 1/8” 3/16” 3/16” ’˙$ 3: Start at an inside corner of the room. Now their is a mix of new exterior grade osb and old OSB (i thinks its interior grade). The tiles (for most) have no need to be sealed, as this is completed when manufactured to With the liner running about 6 inches up the studs. CDX plywood and screw it to the subfloor with 1-5/8 in. 043 W/mK) • Ventilated cavity • Vertical timber board May 1, 2010 · Step 3 – Apply the Top Coat. Apply at least two coats of paint. Plywood manufactured with a fully waterproof adhesive, and with an Sep 1, 2022 · Find out how to install cement boards onto wooden floorboards in preparation for tiling with Tile Mountain’s resident DIY expert, Craig Phillips. OSB is one of a few materials that stone veneer can be installed over. 4. Or, you can install a cement board over the plywood and proceed to tile installation. Oriented Strand Board Structural Sheathing. If the OSB is very porous, it might be a Download the PermaBASE UltraBacker® Cement Board Installation Guide. Oct 4, 2018 · Remove the particleboard and screw the plywood to the floor joists with 1-5/8 in. Apply Siderlath (fiberglass lath) over the top of the cement board. The sheathing acts as a backing material for the stucco Sep 10, 2019 · If the board subfloor is in poor condition, use plywood as a clean, flat surface to glue down 1 ⁄ 2 -in. Depending on the size, OSB boards can be up to 20% heavier than plywood. A standard floor is made of plywood and resilient tiles that are bonded together with a layer of polyethylene (PE) or polyurethane (PU). There are two methods one can use when installing tiles over plywood. Textured or porous OSB may require more paint than smooth floors. Dec 26, 2022 · This video covers everything you need to know to pour self-levelling compound and get a perfect finish on an uneven OSB or Concrete floor. 13 W/mK) • 140mm stud frame infilled with flexible woodfibre batts (0. It probably is a good solution, but best to make sure. You can spray paint OSB, yet the coats will be thinner. 2. 3. In this article, we will discuss the benefits of using cement board and the process of installing it over OSB. To ensure the floor is clean, wipe it with a wet sponge. Expressions-ltd. Mar 10, 2021 · Exterior sheathing is a board or panel that may be made of several different materials. Jan 22, 2023 · Then, install the drip edge (optional), the underlayment, the metal roof panels, the gable trim, and the pipe flashing, also called a boot. If the current subfloor has tongue-and-groove hardwood Hardiebacker, sometimes called "Hardie board," refers to a cement-based panel manufactured by the James Hardie Co. Based on my research, the recommended method is to put down some kind of cement board on top of the OSB subfloor. Apply a top coat of oil-based paint in the color of your choice and allow it to dry. May 12, 2022 · OSB is 19/32 nominal 0. NOTE: Applications over OSB sheathing requires a minimum of 2 coats of Backstop NT – Smooth or Spray. Broadcast dry sand onto the wet FE80 to rejection. You can use a vacuum for that job. FINISH Install tile. Oct 9, 2023 · Here are some estimates based on years of experience: Primer – 150-250 square feet per gallon. The initial coat should be thick enough to hide all the mesh's texture. 2001). Apr 9, 2018 · OSB flooring panels over 2×4 sleepers is one of the most cost-effective ways of installing a flooring system over a concrete slab. (406 mm) o. Jul 14, 2022 · OSB (oriented strand board) is made from large, flat chips arranged in as many as 50 layers, which are adhered together with glues and pressed into sheets. Jan 29, 2009 · Wall and Flooring Indoor Tiling - Backer Board over OSB - I want to install 12 x12 tile in a hall way 4' wide. 5mm plasterboard and skim • 38mm service void • 15mm OSB racking/air tightness/vapour control (0. – jay613. It features formed-smooth edges and square-cut ends. Follow alon Learn how to install HardieBacker Cement Board on wooden floors and the appropriate materials and tools that you’ll need for the job. It will be shimmed up on joists to match existing floor that is 1-1/4" thick . 2005; Kashuba et al. 5) APA Exposure 1 Rated Oriented Strand Board (OSB) nominal 1/2 in (12. Cement board is a durable and moisture-resistant material often used in wet areas such as bathrooms. Manufacturers require 1/2-inch (and 5/8-inch) board on walls for structural reasons. It’s installed over the exterior walls of the home, and can have several purposes from lending structural support to helping to insulate the home. (16 mm) only FASTENING Fasten to studs spaced 16 in. I keep finding contradictory info on whether it is right to apply a leveling compound over the OSB, even w/using a primer. Because it uses leftover wood material, OSB tends to be cheaper than plywood, and it is more uniform since it has none of the knots and other defects that may be present in plywood. floor joists, 5/8” tongue-and-groove exterior-grade plywood or 3/4” tongue-and-groove exterior-grade OSB may be used. You might try backer board with a polymer-concrete overlay. 3/4-in. Around perimeter of each board, position fasteners within 1/2"-2" of edges. Wood-based panels, like Oriented Strand Board (OSB), expand and contract with changes in moisture content. Firstly, clean the surface and remove all the dust and debris before sealing it. Apply a mound of mortar to the subfloor, then spread it out in an even layer, using a 1/4-inch notched trowel. Oriented strand board (OSB) is a durable panel sheathing made from hundreds of thin wood strands that are hot pressed onto sheets with a wax and resin adhesive. I recommend purchasing 1 extra gallon of primer and paint beyond calculations to ensure you don’t run short. It is designed to form a waterproof layer between cement board and tiles, helping create a watertight installation. What is Oriented Strand Board (OSB)? OSB is a sheathing product manufactured from wood strands glued together with waterproof, heat-cured adhesives. Dec 6, 2021 · This will act as a link between the tiles and the OSB. b. Backstop NT – Texture is not recommended for the field of wall application over OSB. Use fiberglass mesh to join the seams, which help with the deflection of the later epoxy coats. 038 W/mK) • 160mm rigid wood fibre sheathing (0. The first step is to apply Perdure E02 directly to the substrate. We are trying to lay slate tile in an entryway. PhilandKathleen | Posted in Construction Techniques on August 10, 2002 05:31am. Leave a 1/8" gap between panels, corners and floor. Here the sleepers must be attached to the concrete slab with mechanical fasteners and/or adhesive (use around all edges using 1-1/4" cement backerboard screws or 1-1/2" galvanized roofing nails. tongue-and-groove plywood or OSB (oriented strand board). Each panel can have as many as 50 strands, which makes them heavy and Mar 10, 2014 · can you post some image of your frame ? if the frame is strong and rigid enough you won't need OSB - just clad with a cement board (also known as tile backer board) - SS mesh and render over - which is a lot of fuss and expense and certainly not designed with long term use in mind Jul 28, 2021 · The use of cement boards in interior walls is subject to restrictions. The 1/4" thickness helps eliminate transition trim when abutting carpet or wood fl ooring and minimize level variations with other fi nish materials. The easiest way to line off your room is to use a revolving Jan 29, 2023 · The ideal thickness of a scratch coat on a cement board should be half or three-quarter inches. Make sure there are no protrusions from old screws/nails. A few things to note: Make sure the subfloor is secured before using the Luan. and 24” o. Then cut the shape out of the rest of the sheet and use the outline to cut the linoleum. Home depot is wrong. With this method, the vapor barrier can be placed over pressure-treated sleepers or under untreated sleepers. When you lay tile over the OSB subfloor, the PE or PU layer Dec 24, 2022 · In general, you should put stone veneer over OSB. 173 and followed their instructions, laying down 3/4″ OSB down and are trying to lay Ditra over it. Oriented strand board (OSB) is a panel sheathing made from hundreds of rectangular thin wood strands (1-inch by 4-inch flakes), arranged in cross-oriented layers. I know that epoxy can go easily over the concrete half but how about Dec 17, 2018 · Fiberboard is less expensive than OSB. If your current siding has any damaged areas, such as rotting, cracking, or peeling, it must be removed before a new substrate or siding can be installed. Adhere panels to subfloor, one panel at a time. Perdure E02 is used as an epoxy primer for this project. Our question is what kind of mortar do you use to adhere the cement board to the USB? We have looked at the back of Tec sturdi flex and Tec full contact and each day not to use with OSB. STANDARDS. (16 mm) cement board is preferred in this application. Install a layer of 5/8-in. Spread the mixture over the cement board, ensuring the entire area is covered. Hardiebacker is a good choice because it is resistant to excessive moisture and it has a high fire rating. Temps range from -20 degrees in winter to over 100 in summer. We show the process of staining this cement floorin Aug 29, 2019 · Cement board over top, or rip out what I had just finished and put cement board directly over the plywood subfloor? Out with the OSB. thickness or more. But, if I put down some kind of cement board on top of the OSB, the new tile floor will be higher than the surrounding laminate floor. Anything thick enough to support it's own weight over the span of a room would need special structural reinforcement on the wood support structure to hold it up. Unfortunately, OSB tends to swell up to 15% of its original size when exposed to moisture. Do this while it’s still wet because it will be easier. Attach the cement board and OSB with masonry screws every 6 to 8 inches, leaving a ⅛ inch gap. Embed the lath in Perdure E02 epoxy primer. Based on my research, it seems most people advise against tiling directly over OSB. Typical vinyl and aluminum siding have plenty of air-gaps behind them without having to do anything. Hardiebacker, sometimes called "Hardie board," refers to a cement-based panel manufactured by the James Hardie Co. Work from the bottom up. Apr 18, 2023 · You can put cement board over OSB if the OSB is in good condition and has not been damaged by proper water exposure. This includes dirt and dust. Whether you use a paint roller or paintbrush really depends on the size of the surface that you are painting. Applying self leveling compound to a single room is a fairly straight forward process. ’˙$ 2: Cut out any fixture openings. You need to put down some solid ply prior to tiling. Comb out adhesive or mortar in straight, parallel rows (as shown below) and immediately cover with panel. Welcome to the Pros Hub. The siding must be 100% intact and in good condition to act as a substrate for new siding. It can be used to cover the wall around the fireplace opening, and it can also be used to frame the opening itself. that's plenty of time for moistu Dec 5, 2019 · www. If you want to install stucco, the recommended method is to apply it over sheathing. I think currently most of the manufacturers say to use modified thinset under the board, even though the testing at the TCA lab seems to indicate that unmodified is the better choice. 7 mm) or 5/8 in. Subfloor or Base: For flooring applications with 16” o. Use a polyester resin filler to conceal any noticeable gaps. Can I set the 1/4 backer board in thinset on 3/4 T&G OSB? Yes, KERDI membrane will stick to cement board. The cement board needs to be clean, free of debris, and dry. Use this self leve It'll give your tile job the best chance of success (the SLC itself acts as your underlayment), and you won't be raising the bathroom floor above the floor in the hallway as much as you would be with thinset under cement board. Mar 5, 2010 · Here’s why: Plywood and OSB expand and contract with humidity and temperature much more than ceramic tile. Now, since you are planning on installing this on top of tile, you will need to drill pilot holes, and this will take a lot of time and possibly quite a few drill bits. Each panel can have as many as 50 strands, which makes them heavy and Jan 21, 2011 · Liquid-WRB + paint for OSB shed Hi Martin, I have built an OSB-sheathed storage shed, whilch I plan to finish in something weather-proof, but don't need insulation etc. Then, screw the backer board into the subfloor using special backer board screws. All it takes is the right preparation. We have 3/4 OSB and want to attach Durock to it. Read Also: Place the first sheet of backer board on the mortar. Much stronger than plywood for example. This will give the sealant enough time to dry before tiling and applying adhesive on the board. For 19. On this floor we want to put ceramic tile in the kitchen area. Step 2 – Cut the DITRA Into Smaller Sizes. Jan 20, 2006 · Re: tiling over osb The subject of bonding/not bonding the backer board to the subfloor has been all over the place in the past few years. Cement board, such as Hardiebacker, is a good option for this. Depending how the tile comes off, @shirlock homes has a good point - cement board, if you can get the thinset off (a silicon carbide rubbing block may be handy for the last bits) is a perfectly good base for laminate. Can a couple of you Pro's give me some advice? May 15, 2023 · PermaBASE cement board is specified for 5/8-inch tongue-and-groove exterior grade plywood or OSB on top of 16-inch on-center joists with a minimum L/360 deflection. Mar 18, 2021 · In this video I will be showing you how I prepared the wood subfloors at the project fliphouse for tile by installing cement board myself! Im not a tile expe NoviceDIYer. Install tile. Sand and clean the surface – but leave the edges alone. Repeat until the entire mesh wall is covered. Then, flip the board over, fold at the score, and cut the board the rest of the way. Mix a small batch of thin-set mortar as directed by the manufacturer, mixing the dry powder with water in a bucket. We are building a new construction 2 story home over an existing walkout basement. I have numerous dips in the floor (up to 5/8")and want to level it up before using Ditra under my tile. 7 mm), minimum. Uncut OSB panels have excellent water resistance, but cut pieces are highly susceptible to water damage. Then red gaurd all the cement board, especially the joints and screw holes. FE80 is a flexible epoxy that acts as a. 7 mm) & 5/8 in. I had to cut some pieces out of the floor due to rot and replaced it with new OSB. JOINING Fill joints with latex-fortified mortar or Type 1 organic adhesive and immediately embed alkali-resistant, fiberglass mesh joint tape. Many applications where plywood was used now use OSB. Nov 29, 2012 · To use your current siding as the substrate for new siding, it must be in pristine condition. Note: Because cement board fasteners may protrude through the plywood base when 1/4" cement board is used, 1/2" or 5/8" cement board is preferred in this You could certainly try a heavy crowbar/ripping bar on it, and see which is more effective. Note: Because cement board fasteners may protrude through the plywood base when 1/4 in. That is why it is recommended to leave a 1/8-inch gap when installing OSB as a subfloor. Code requires a liner. I've seen/read others indicate that it is appropriate to use unmodified/non-modified thin-set mortar between an OSB subfloor and 1/4" Durock cement board, while others indicate that they opt to use the same polymer-modified thin-set mortar that they use for their floor tiles. drywall screws spaced every 4 in. Cheaper than plywood: More uniform in strength and quality: More moisture-resistant than traditional plywood: Provides excellent structural support: Jun 3, 2023 · One of the biggest advantages that you get with OSB is, quite simply, that it is extremely strong. Then the entire floor covered in 1/4" cement board. OSB / timber frame / sheathing / vertical timber boarding • 12. There are various types of seals out there, but choose one that fits the needs of the space, but that will also keep the most stains from penetrating the surface. If the subflooring is in good shape, nail it down without the plywood, assuming the engineered wood is of good quality and 1 ⁄ 2 -in. the field of the board. I brought 1/2" DUROCK and planning to place Nov 16, 2014 · The location sees 5294 heating degree days with annual rainfall of 12" and snowfall of 18". Redguard does not count for under the shower pan. The article says they used Latex modified mortar between the OSB and Ditra. Apply the paint using a roller or brush to ensure an even and smooth finish. More primer or more coats of paint will be required. I'm re-doing my bathroom floor which has a 23/32" OSB sub-floor 16" o. No extra layers of underlayment are required. Priming Step 2: Apply Duraamen’s CP1000 acrylic primer, over the cured Perdure E02 and broadcasted sand. In fact, OSB has about twice the shear strength of plywood Apr 3, 2023 · What OSB Is. Testing out products to do a cement overlay over OSB wood subfloor in a house. Both OSB and plywood swell, but plywood swells evenly across the entire board, while OSB tends to swell on the edges. OSB and plywood are very similar, but OSB is a bit Sep 9, 2022 · Below is a quick guide on the installation of DITRA over OSB. Jul 17, 2022 · In this video, you will learn how to install cement board for a tile shower. The first and most obvious step is to clean the OSB floor. In the end, you will have a beautifully painted OSB wall, roof, or floor that should last a long time. Regular seasonal humidity shifts are significant enough to make the average 10′ x 10′ wood subfloor floor expand or contract as much as 1/2″. The actual OSB subfloor that has tongue and groove allows for it. Cement Board. Since the 1990s, oriented strand board has proven to be an economical and competitive structural panel, its ’˙$ 1: Trim panel to fit and create over-sized pilot holes. Use 1 1/4-inch screws for 1/4-inch backerboard. 1/4"x3'x5', 60 pieces per unit. Therefore, according to the 2012 TCNA Handbook, they are not recommended as a substrate material for direct bonding of ceramic or natural stone tile with cement mortars. Mar 25, 2023 · Swelling is also an issue with OSB. Next, install Perdure FE80. Ceramic tile doesn’t expand/contract nearly as much. Jul 25, 2023 · Oriented Strand Board (OSB) is a commonly used sheathing material that provides excellent support for metal roofing systems. This is the reason why, over the years, it has overtaken plywood in popularity when it comes to applications such as flooring, roofing, and walling. It is also a good substrate for tile or stone installations. OSB is short for oriented strand board. APA Voluntary Standard PS 2-92 specifies performance standards for OSB and. Ensure the OSB is installed according to the relevant building codes. Exterior sheathing can be loosely grouped into two categories: structural sheathing and non-structural sheathing. osb is not an acceptable substrate for any form of tile. The scale is divided into three classes. Hardie board is installed over a plywood or OSB base for floors, counter tops or any horizontal surface and applied to vertical wall framing over water Unfortunately, OSB tends to swell up to 15% of its original size when exposed to moisture. It is crucial to use CP1000 with our Skraffino microcement to Nov 15, 2013 · We know from experience that 3/8 of an inch is a pretty safe dimension 4 with stucco, manufactured stone veneers, wood claddings or other claddings like fiber-cement that lie flat against the housewrap and OSB (Photograph 3 and Photograph 4). Using a pencil, trace the edges of the floor. (12. Apply a thin layer of mortar over the OSB for the cement board to adhere to. From the side, OSB has the appearance of giant cornflakes pressed together to form structural panels in sizes similar to plywood, such as 4-foot by 8-foot. Installing cement board over OSB (oriented strand board) can provide an extra layer of protection against moisture damage and create a smooth and stable surface for tiling. A true OSB product is a great substitute for any application where you would use plywood. Apply the plaster to the walls with a float trowel. Aug 10, 2002 · Installation of Durock to OSB. Cement board is basically a mixture of cement and reinforcing fibers (fiberglass strands) that is formed into a sheet that can be attached to a wall easily, providing a great base for tile or other masonry products. A thin prybar (wonderbar) will probably get bent. Use a heavy waterproofing primer, and apply several coats. OSB is a synthetic wood product made from chipped wood. I recenty set large porcelain tiles over sealed slab and the thinset was still wet 4 days later when I replaced one tile. Jun 4, 2018 · Plywood is about 15 to 19 percent lighter than OSB. 1. drywall screws spaced every 6 in. c. As the plywood or OSB expands, the Jul 22, 2016 · I am building a new home, using 3/4" OSB (Advantech) for a subfloor. That is because, if you lay tile over the OSB subfloor, it will eventually warp and crack. I see my options at this point: cement board (HardiBacker), OSB, PT 1/2" plywood. My recommendation would be to re-sheet with 1/2" good one side ply, perpendicular to the existing Osb, screwed down every 4". Wall & Ceiling Installation 1/2 in. ek up vk jo nd jj ns ze tu zk