Self-stick tile, also known as peel-and-stick tile or self-adhesive tile, can be a do-it-yourselfer's best friend, saving money and mess on sticky adhesives when laying a new vinyl tile floor. If you opt for Keraset, you need to be wary of its recommendations. According to backer board manufacturers and tile setters, installing backer board directly over an old, solid-wood subfloor is risky for a couple of reasons: First, changes in humidity make … For example, to set DITRA over plywood or OSB, a modified thin-set mortar meeting the requirements of ANSI A118.11 is used. Hardiboard instructions say to use a "mortar or modified thinset" under the board. Liquid error: internal. Moreover, the Flexbond modified thinset (sold at HD, for example) specifically lists redgard as one of the surfaces it can be applied to and therefore, following manufacturer recommendations, a person should be using a modified thinset like flexbond over Redgard . I reinforced the 3/4 OSB from BELOW in order to eliminate deflection between the joists. Login; Sign Up; Username Password Share. To remove thinset, start by pouring boiling water over the thinset to weaken the material. The type of thin-set mortar used to install DITRA depends on the substrate material. Tweet. While you can tile over drywall walls, the paper covering on drywall can tear, destabilizing the tile. Tags: Best of the Blog, Ceramic tile over OSB subflooring, ceramic tiling tips, OSB panels, Stabledge, Sub-Flooring, TruFlor, TruFlor pointSIX. Step 4 Allow the thinset to set until it is almost dry. The best method is to refasten the subfloor, then add a layer of plywood. Wrong. Thinset is the wet base that you first trowel on the plywood to make the tile stick. I have gone behind numerous tile setters to remedy their work when they thought (as many of the others that are commenting here) that using thinset under 1/2″ Durock (over 3/4″ OSB) provided a sturdy substrate. I'm using 1/4" Hardiboard over an OSB subfloor, then installing 12" porcelain tiles over that. Then you do the cement board in thinset and tile over. The grain of the strips for each layer is oriented perpendicular to one another, similar to plywood. There are two materials commonly used for laying ceramic on plywood or OSB that are applied before the tile: Thinset tile mortar has a smooth, slippery consistency, similar to … To set DITRA over concrete or gypsum, Schluter-Systems recommends an unmodified thin-set mortar meeting the requirements of ANSI A118.1. best thinset for ditra to plywood. The thinset is under the board to fill in the voids much like you talked about with the OSB, it is not for bonding, it is strictly a filler. Call us Today ! Leave it for an hour, then hold a sharp putty knife at a 45-degree angle and hammer the back with a hand maul to break up the thinset. Not true at all. Thinset Tile Mortar . 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. Oriented strand board (OSB) is made of layers of thin rectangular strips of wood (from shredded trees) that are compressed and bonded together with a binder. Thinset is a mortar that is made of Portland cement, silica sand, and moisture-retaining agents. While these could be smoothed over with thinset, they are much harder to manage than the correct solution. 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. I would like to remove the lauan and sheet vinyl then lay 12×12 porcelain tiles over the entire floor. Most all the tile I've set has been over 3/4" osb. DITRA allows for ceramic tile application over single-layer plywood or OSB subfloors on joists spaced up to 19.2" (488 mm) o.c. Accordingly, can you mix modified and unmodified thinset? Then you can just mix the thinset with water for setting the tile. Mix thinset per instructions and use modified. – to this two-layer plywood base and you will have one of the best substates available for thinset ceramic tile. Using Screws to hold down the hardiboard and fully secure the 2 layers of subfloor that equals 1 1/2". ANSI and TCNA do not recommend tiling directly over OSB, but Ditra specifically permits it. 3/4" OSB is a minimum industry standard. OSB or … And if you use a thinset approved for that substrate, there are no problems at all. Therefore, it’s best to use unmodified thinset when working with an impervious installation membrane like Prodeso for installing radiant floor heating. 5/8" plywood is a minimum standard. ... Nobleseal, etc. Modified thinsets stick great to OSB.The manufacturers don't want tiles bonded directly to OSB because it's not as stable the other approved substrates. To set DITRA over concrete or gypsum, Schluter-Systems recommends an unmodified thin-set mortar meeting the requirements of ANSI A118.1. Fill the spots until the thinset is level with the string. Subscribe to the Builder Insights Newsletter Email Address. I had no trouble getting unmodified thinset at Home Depot. Ceramic tile to be set with modified thinset over Hardibacker set in non-modified thinset. Vinyl tile, resilient vinyl, and multi-layer vinyl can cause a number of problems, including moisture problems and shifting. What Thinset do you use over redguard? Two of the best known products of Mapei are also two of the best unmodified thinset on the market. The subfloor is 23/32 T&G OSB, with ¼ inch lauan and sheet vinyl over top. > best thinset for ditra to plywood. This surpasses minimum standards and I always feel more comfortable with this mix. Smooth out the surface of the thinset with a finishing trowel, which has a smooth edge. The installation manual for HardieBacker suggests to embed it in thin-set and it should be installed over plywood. 559 266 4000 | info@ajtruckschool.com . Of course your thinset will also need to be approved for OSB. Higher latex content is essential for bonding to plywood. Proper Way to Lay Ceramic on Plywood or OSB. Thinset (aka the bed sheet) is difficult to get perfectly level, so you need a very strong flooring type to hide any “imperfections.” Ceramic, glass and stone tile floor coverings work great with latex-modified thinset. A quality unmodified thinset should be used and mixed with a latex additive. For example, to set DITRA over plywood or OSB, a modified thin-set mortar meeting the requirements of ANSI A118.11 is used. osb is not an acceptable substrate for any form of tile. Personally, I usually shoot for a 1 1/4" sublfloor (3/4" + 1/2" Ply). Mud bed for a shower should have a cleavage membrane under it so the mortar doesn't bond to the subfloor. As with all tile installations, preparation of the subfloor can easily determine the success or failure of the project. They also have a proprietary 1/2" wonderboard over 3/4" t-g exterior plywood subfloor where joists are 24" oc. It’s the same way thinset and self-leveling work. Never lay tile over these materials: Drywall. Kerabond is classified as the company’s premium unmodified thinset so it is well worth the investment. If you're unable to remove all of it, smooth out the surface with an angle grinder and a diamond grinding wheel. Click to see full answer. Your best case scenario for success. In this video, learn how to prepare a wood or concrete subfloor for tile, including such steps as checking for dips, installing backerboard, applying primer and thinset, pouring liquid underlayment and when to use OSB or exterior-grade plywood. I've done quite a bit of Ditra using 333/317 and no problems. One example would be to use Laticrete's 317 thinset … Thinset mortar is your default tile mortar for most indoor and outdoor applications. Spread the thinset over the surface, filling in the low spots and holes. Purchased an 1980's cabin in the PacNW which turns out to have OSB underlayment over solid wood planks above a crawl space. 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. Plywood and OSB frequently have imperfect joints and surface textures. It's important to note that latex-modified thinset can still be used between the membrane and the subfloor because it is not impervious. 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. 5) Henry 549 FeatherFinish at home depot costs $17 for 7 lbs, but it is owned by Ardex and many online seem to say Ardex FeatherFinish and Henry 549 are the same--and also that Featherfinish is the best stuff there is. I've even used K/K and no problems. The 24" oc joist with 1/2" wonderboard is the only one requiring plywood as opposed to osb. Thus I would suggest removing the current wood planks flooring, install a 3/4" outdoor grade plywood, thinset and then your HardieBacker (screwed down). As such I got the Henry branded stuff and tested on OSB. 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. Uncoupling Tile has been successfully installed for thousands of years by incorporating an uncoupling layer, or forgiving shear interface, within the tile assembly. Regarding this, will Thinset stick to OSB? In the case of Ditra that is not a problem since Ditra 'absorbs' the stress as the OSB. Objective was to keep the tile on the same plane with hardwood floor without using transition piece. Span of beams under the wood planks is 10 ft and spacing is about 18 inches. In 11+ years, there's not a grout crack or any other problem in sight. shrinks and expands.. One may also ask, what is the best underlayment for tile? joists, use 5/8 Re: thin set,mortar bed over 3/4 osb subfloor 3/4" osb is fine provided the joist deflection (span) is good (and spacing.) Non-sheet vinyl flooring. Foyer project. Hope you didn’t like your beautiful new tile floor! Although no thinset can be used to set TILE over OSB, the use of an unmodified mixed with liquid latex will work. 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