Your privacy is important to us; your email will remain confidential and will not be shared with any other parties. Inspect the subflooring panels prior to installation of the ceramic tiles. You can still use an exterior grade OSB and THEN backerboard, but instead opt for using non-modified mortar alongside backerboard screws to fasten it down. 0. cougarmandan. 16 inch on-center joist spacing with single layer OSB or plywood subfloor; ... By following your instructable, I ended up using un-modified thinset on my wood subfloor and then modified thinset over the Ditra. 4 years ago In order for any tile to be placed on a bathroom floor, almost any manufacturer and tile installer will tell you to use tile backerboard over a plywood subfloor. ... that using thinset under 1/2″ Durock (over 3/4″ OSB) provided a sturdy substrate. Mix thinset per instructions and use modified. Please do not hesitate to ask me any further questions, and I hope if this has assisted you. ANSI A118.1 means that it is UN-modified! Thinset is the wet base that you first trowel on the plywood to make the tile stick. I followed the instructions for Masterblend that I got from the web (8 quarts water/50 lbs). Ensure that an adequate vapor barrier and proper ventilation have been installed in crawl spaces to forestall any moisture issues. Find Applying Thinset Mortar Over Osb related suppliers, manufacturers, products and specifications on GlobalSpec - a trusted source of Applying Thinset Mortar Over Osb … Now I want to install ditra membrane over it and am not sure which thinset to use. It's ok to put a layer of thinset between the OSB and backer board. This is done to ensure the best installation for your porcelain tiles. Although the bag says use for concrete floors, it can used used over OSB and underneath tile backerboard. We won't send you spam and only send at most two updates per month. The joist depth, spacing and deflection may vary depending on what type of product is being used and the loads the system will be required to carry, so always check with your tile manufacturer and design professional prior to installing your subfloor system. Or if I use a latex sealer, do I even need the mortar under the backerboard? Apply glue only 2 panels ahead of the installation to avoid the glue setting before you are ready. What I've found is many people asking the question and very few people giving any actual idea on how to remove the imperfections in OSB. Apply thinset over tape and joints. ". Most all the tile I've set has been over 3/4" osb. Plywood and OSB frequently have imperfect joints and surface textures. . I suggest you lay down plywood over the planks with subfloor glue and decking screws. Dampen the … DITRA is approved for use with ceramic, porcelain, and natural stone tile. Tags: Best of the Blog, Ceramic tile over OSB subflooring, ceramic tiling tips, OSB panels, Stabledge, Sub-Flooring, TruFlor, TruFlor pointSIX. It is important to use a very good quality polymer modified thinset to install the ditra on the sub floor. Typically 8" … 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. Run a level across the surface and circle any high points or low points with chalk. Norbord applies the latest in strand & resin technology, combined with continuous press mill capabilities to customize lengths, widths, thickness and surface characteristics. I'm glad you were doing your research, and it sounds like you have a good grasp of the installation process. In this episode of TileTV, we answer the popular question "Can I install tile directly over OSB? You definitely don’t want to adhere tile directly to OSB. It depends on what you are installing. To prevent your ceramic tiles from cracking, do not apply any weight to the floor until all mortar has properly dried. This gap allows for expansion due to changes in moisture conditions and can prevent buckling and uneven floors. Manufacturers generally recommend that the deflection of the subfloor system be limited to no more than span/360 under total load. However, all latex-modified mortar that I looked at says not to put it on OSB. Ceramic tiling can be installed onto 23/32” OSB subflooring panels where the panels are supported by 16” o.c. Remember you are also using backerboard-rated screws for them alongside the mortar. Problem is that I think that I screwed up the consistency of the unmodified thinset over the DITRA. Search for: tile over osb Published by on December 13, 2020 on December 13, 2020 British Standards recommend a minimum of 15mm thick plywood to be used for over-boarding purposes (any less will not provide the rigidity required). If so, what should I use? The backer board should be screwed down according to the manufacturers specifications. That's where a membrane like Ditra comes in. The HD on-line project instructions say that when installing porcelain tile, that it should be over exterior grade plywood, but that "Oriented strand board, or OSB, and exterior-grade plywood will work if first covered with a latex-modified mortar and a tiling backerboard." While these could be smoothed over with thinset, they are much harder to manage than the correct solution. I bought VersaBond Professional Thin Set Mortar (unmodified). The backer board should be screwed down according to the manufacturers specifications. A designer will take all the factors that affect the dead and live loads into consideration to establish what the floor system requirements are. It can be installed over a variety of substrates including plywood, OSB, existing vinyl, structural planks, and concrete. Click on the image for pricing and more information. For wall installations, your real concerns are whether you want to use thinset directly on the wood and whether you are using an exterior or interior type of plywood. Do I need a latex sealer on the OSB prior to putting down the mortar and backerboard? To set DITRA over concrete or gypsum, Schluter-Systems recommends an unmodified thin-set mortar meeting the requirements of ANSI A118.1. Please fix the wording here. There are tile companies that actually use 3/4″ exterior rated plywood as their standard substrate with a quality modified thinset. Re: thin set,mortar bed over 3/4 osb subfloor 3/4" osb is fine provided the joist deflection (span) is good (and spacing.) Careful attention must be paid to the construction and preparation of the subfloor in order to Most manufacturers want you to use modified and so do I. Carl Anders on August 16, 2020 at 10:40 am This is in contrast to 'medium-bed' (up to 1/2 All thinset mortars will say not to install tiles to OSB, that's not what you're doing. I will be applying Schluter Ditra over the Hardibacker before applying the tile. It is optional, but you can still seal the OSB but it really isn't needed. But, you cannot bond tile to osb because the resins used to make osb will not allow the thinset to remain bonded for very long. I've googled this extensively. Make sure the backerboard sheets are installed perpendicular to the OSB sheets to ensure better stability. You can use either unmodified or modified thinset under the CBU. Reply. Art focuses on a single contractor approach to customized renovation work, and performs projects such as installing custom tile showers, fixing tiled shower leaks, replacing cracked tiles, and installing floor and wall tile. The person who told you to use two coats of Redgard over OSB doesn't know what he's talking about. It won't get a bond strong enough to deal with the stresses of a direct OSB-to-tile installation. Always follow the manufacturer’s installation instructions and/or the Tile Association’s recommendations. DO NOT install tile directly over OSB (that's what the thinset manufacturers are referring to). ? Allow all repair work to dry before continuing. Tiling should be one of the last tasks completed on the building site to prevent chipping and cracking. OSB panels provide an excellent base for many types of finished flooring including ceramic tiles. One example would be to use Laticrete's 317 thinset mixed with Laticrete 333 liquid latex additive. There are two materials commonly used for laying ceramic on plywood or OSB that are applied before the tile: They also don't require screws or nails, and you don't have to put mesh tape and thinset over the seams like you would with cement or fiber boards, so the difference in cost is relatively minimal. Trying to remove thinset off of plywood is difficult to do without damaging the plywood. OSB panels are manufactured under the provisions of APA PRP-108 or PS 2-92 and are comprised of soft, thin wood strands or chips, which are held together with waterproof adhesives. You can click on the image below to find out additional information regarding getting a lifetime warranty out of your backerboard, tile, grout, and sealer. Login; Sign Up; Username Password Thinset – Thinset is a cementitious product that requires water to create a chemical reaction much like concrete. It's ok to put a layer of thinset between the OSB and backer board. In my master bath I laid Ditra directly on 3/4" OSB, then thinset in a low voltage electric radiant heat mat, then tiled 4x4 travertine over that. It'll act as an intermediary between the tile and the OSB. Manufacturers generally recommend that the deflection of the subfloor system be limited to no more than span/360 under total load. Thank you for your question and welcome to the community! With over 10 years of experience, he specializes in bathroom and kitchen renovations. Ensure that the subflooring is correctly fastened to the joists and that the fasteners are not overdriven.
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