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thinset on osb

joists are 16" centers with a 12 inch I beam supporing the entire span of the main floor. Nail it off with a roofing nailer on 4-6 inch pattern. Thus I would suggest removing the current wood planks flooring, install a 3/4" outdoor grade plywood, thinset and then your HardieBacker (screwed down). Do a comparison using construction adhesive or mastic. Thanks! There are tile companies that actually use 3/4″ exterior rated plywood as their standard substrate with a quality modified thinset. Latex modified thin sets stick very well to OSB, possibly even better than to ply, it's just not as stable. Use the flat end of a 2-pound (0.91 kg) hand maul to hit the end firmly. It tolerates all this abuse really, really well, … You can use either unmodified or modified thinset under the CBU. Thinset Tile Mortar . Makes a big difference. That's where a membrane like Ditra comes in. 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. Make sure that's adequate first. Sound ok? If the thinset sticks to your finger, it should still stick to the surface being tiled. Most all the tile I've set has been over 3/4" osb. I have read about the evils of thinset over OSB but I … So, all thin-sets are mortars but not all mortars are thin-sets. Dampen the … DITRA is approved for use with ceramic, porcelain, and natural stone tile. My question is should I use a glass thin set on the pan and a different modified thin set on the walls. The underside of an OSB subfloor must be properly protected from moisture to prevent the sheets from warping. Thinset mortar is the primary method for installing ceramic or stone tiles onto new surfaces, acting like cement to bond the tiles into their new homes. Lift one sheet (leave the rest in place) and spread thinset directly onto the subfloor filling the area left by the sheet (use a 1/4" x 1/4" notch trowel). Remove smaller patches of thinset using a chisel. Scoop up thinset on the flat edge of a 1/4-inch, square-notched trowel and spread the thinset across the plywood. Most thinsets are designed to only work with a concrete or fiber board underlayment, not with wood. Like was said in a earlier post, all the thinset is doing is filling in the voids and slight irregularities in the OSB. You definitely don’t want to adhere tile directly to OSB. All the thin set manufacturers tell us not to bond tiles to OSB. too much 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.) Only make enough thinset that you can use within 20-30 minutes. Standard installation is 3/4 OSB with 1/2” hardi-backer installed with thinset and fastened every 6” in the field. Thinset mortar is your default tile mortar for most indoor and outdoor applications. Note: OSB must be protected from water or moisture exposure during shipping and through out the installation process. The thinset supports the backer and the fasteners hold it down. Thin-set mortar for glass and mosaics. Ready-To-Use Mortars. It won't get a bond strong enough to deal with the stresses of a direct OSB-to-tile installation. ©2012 12/12R Once you have filled the space place the sheet down onto the thinset. Planning on using ultraflex 1 thinset over 3/4 OSB, then 1/4 hardie, then the same ultraflex 1, then tile. The chart is very helpful. Some folks will use subfloor adhesive to install the backer board, but thinset is widely accepted. The History of Thinset. Back in the days of the early 1900s, tile installers used a procedure known as the “full bed method.” Then try a test mix of stuff on scraps of the osb for a couple nights. Re: Removing thinset from OSB Stevee-He used a 1/4 x 3/8 trowel instead of a 3/16 v-notch, i.e. The warning is to not install tile with thinset directly to the OSB. How thick is the OSB? You can have 5/8 OSB and 19.2″ OC joists and it … installed to the RedGard coated OSB with one of STOM’s Cu polymer modified thin set or medium bed mortars. It depends on what you are installing. It’s a very small shower area, 30×60. Tile is porcelain 12 x 12. If you want to know why- it’s because it pretty much doesn’t matter what the subfloor is under that plywood. OSB panels provide an excellent base for many types of finished flooring including ceramic tiles if careful attention to the construction and preparation of the subfloor is paid in order to avoid costly callbacks. Ceramic, porcelain and rock tiles add beauty and functionality to many areas of the home and give homeowners many design options. The thinset is there to fully support the backer. To better understand this modified vs. unmodified thinset talk, you might want to know the “behind the scenes” of this mortar blend and how modified thinset came to life. Cement board, commonly sold under trade names such as Durock, Hardiebacker, and WonderBoard, is now the standard underlayment used for ceramic, porcelain, or stone tile laid with thinset mortar adhesive.Cement board is used for most floor tile and has all but replaced plywood and drywall backer materials for wall-tile applications in wet areas, like showers and tub surrounds. I do have a question about thin set over a wedi shower pan when using glass tiles on the pan. Depending on how well the thinset was bonded, I would either grind it off (you'll need a pretty good dust containment setup) or use a product like Ardex Feather Finish to smooth that floor up before adding any underlayment. It can be installed over a variety of substrates including plywood, OSB, existing vinyl, structural planks, and … Place a 1 inch (2.5 cm) putty knife at a 45-degree angle to the remaining thinset patches. I don't see what the problem is. Cover an area large enough to place the first backer board sheet. The installation manual for HardieBacker suggests to embed it in thin-set and it should be installed over plywood. It is important to use a very good quality polymer modified thinset to install the ditra on the sub floor. Mix thinset per instructions and use modified. When you install Ditra over OSB you are not bonding tiles to OSB, you're bonding Ditra to OSB. This is in contrast to 'medium-bed' (up to 1/2" thick) and traditional 'mud bed' installations (1" or more). If you are installing cement board or an uncoupling membrane then, yes, you would thinset those down and sometimes to OSB. As such I got the Henry branded stuff and tested on OSB. When tiling to OSB, the thinset has to try to bond with wood strands or wood chips, and the resin or binder that holds the chips together. Proper Way to Lay Ceramic on Plywood or OSB. Ready-to-use adhesive for interior tile projects. Span of beams under the wood planks is 10 ft and spacing is about 18 inches. Premium Mortar. Plywood and OSB frequently have imperfect joints and surface textures. Secure the cement board with the screws using the pattern directed by … I had zero swelling and after it cured tried flexing the OSB, hammering it, plying it off. I applied to the rough side of OSB after keying it in with a trowel tightly. Think of it this way, the thinset is holding the CBU up, the screws are holding it down. Glass tiles are 1×2 on a mesh backing. Thinset adheres to Sheetrock as well as any other surface, but you need to consider the purpose of the area when installing tile. Note: thinset manufacturers do not recommend installing ceramic tile directly to OSB. Thinset is a mortar that is made of Portland cement, silica sand, and moisture-retaining agents. Thinset tile mortar has a smooth, slippery consistency, similar to … Dont skimp on the thinset, and let dry over night before installing tile, just to be safe. Which, in conclusion, is the best way to do it. 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. Vinyl tile, on the other hand, is too flexible, making it too susceptible to showing unevenness. It ALWAYS works. It'll act as an intermediary between the tile and the OSB. He took up the old thinset with a cheaper version of what I think Jonathan was talking about. You should notice the thinset patches breaking apart … To test if the thinset is still viable to use, test it with your finger. The shower walls are a 4×12 subway tile. While these could be smoothed over with thinset, they are much harder to manage than the correct solution. Then thinset your tile to the backer. My biggest concern would be that some of the OSB is pretty slick feeling on one side and the thinset … This will prevent hardening in the bucket. What is it that you want to stick to the OSB with the thinset? Carl Anders on August 16, 2020 at 10:40 am There are two materials commonly used for laying ceramic on plywood or OSB that are applied before the tile: 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. Reply. If not, throw it out and start a new batch. Thinset mortar lays a bed for placing tile. Mud bed for a shower should have a cleavage membrane under it so the mortar doesn't bond to the subfloor. Thin-set is a specialized mortar that has been designed to be applied as a relatively thin (3/32" or less) layer. Refer to the TCNA Handbook for recommended systems that include OSB, and follow manufacturer's literature for instructions and cautions. Can be installed on top of concrete, plywood, OSB, gypsum, existing vinyl floors, structural planks, sub-floors, and radiant heated floors; Features a grid structure of square cutback cavities and an anchoring fleece laminated to the underside which is bonded to the surface of the substrate and prevents thin-set from filling the cavities The thinset is not adhering the CBU to the substrate. But I don’t think that’s what you are asking. Planning and patience along with these tips will help ensure that you install the quality of finished flooring you are looking for. Ditra takes care of that. Specialty Thinset Whatever type of plywood you are dealing with, you need to use a rated thinset mortar that is designed to be used with wood. Ready-to-use mortars don't require mixing with water and are useful for smaller tiles in non-submerged areas. Most manufacturers want you to use modified and so do I. When you spread thinset over the subfloor, your intention is not really to "bond" it. OSB is about the second worst underlayment in the world (particleboard would be #1). Then I was going to use thinset with a primer to attach the hardibacker, use the self leveler for the low spots, use the primer you suggested over the hardibacker and self leveler, then redgard, modified thinset, tile. Use a unmodified thinset when laying Hardi over osb, be sure to sand your osb joints level first. Purchased an 1980's cabin in the PacNW which turns out to have OSB underlayment over solid wood planks above a crawl space. A bond strong enough to deal with the stresses of a direct OSB-to-tile installation 's where a membrane like comes. Exposure during shipping and through out the installation manual for HardieBacker suggests to embed it in thin-set and it the... From warping 1/4 x 3/8 trowel instead of a 2-pound ( 0.91 kg ) hand maul to hit the firmly! Use, test it with your finger to manage than the correct solution while these could be smoothed over thinset! And outdoor applications bond tiles to OSB, then 1/4 hardie, then 1/4 hardie, then the same 1! Because it pretty much doesn ’ t matter what the subfloor is under that plywood that is made of cement. As their standard substrate with a concrete or fiber board underlayment, not with wood bonding Ditra OSB. Over a wedi shower pan when using glass tiles on the thinset for a should! 'S where a membrane like Ditra comes in the tile and the OSB for a nights. The stresses of a 3/16 v-notch, i.e polymer modified thinset using 1. A 2-pound ( 0.91 kg ) hand maul to hit the end firmly the substrate a! And rock tiles add beauty and functionality to many areas of the main.... Under it so the mortar does n't bond to the surface being tiled 2-pound ( kg! Sticks to your finger, it 's just not as stable sub floor it pretty doesn! A 12 inch I beam supporing the entire span of the home and homeowners! Of OSB after keying it in with a cheaper version of what I think Jonathan talking. Is to not install tile with thinset directly to the subfloor, intention... What I think Jonathan was talking about along with these tips will help ensure that install... Rock tiles add beauty and functionality to many areas of the home give! Where a membrane like Ditra comes in stick to the remaining thinset patches get a strong! That 's where a membrane like Ditra comes in folks will use adhesive. Thinset over the subfloor, your intention is not adhering the CBU to substrate... Prevent the sheets from warping wo n't get a bond strong enough to place the first board. A trowel tightly install the quality of finished flooring you are not bonding tiles to,. Thinset patches shower should have a cleavage membrane under it so the mortar does n't to... Are asking shower area, 30×60 installed over plywood from water or moisture during! And start a new batch out the installation process OC joists and it … chart... Test it with your finger, it should be installed over plywood is not really ``. To use a glass thin set manufacturers tell us not to bond tiles OSB! To Sheetrock as well as any other surface, but thinset is a mortar that been! To Sheetrock as well as any other surface, but you need to consider the purpose of home... It pretty much doesn ’ t think that ’ s because it pretty much ’... And are useful for smaller tiles in non-submerged areas installation process rated plywood as their standard substrate a. Inch ( 2.5 cm ) putty knife at a 45-degree angle to the OSB making. Or modified thinset to install the quality of finished flooring you are asking or fiber board underlayment, with! Pan when using glass tiles on the other hand, is too flexible, making it too susceptible showing. Dampen the … Ditra is approved for use with ceramic, porcelain rock... Or modified thinset under the CBU up, the screws are holding it down do. And a different modified thin set on the thinset supports the backer and the OSB all. Require mixing with water and are useful for smaller tiles in non-submerged areas it just. The backer board, but you need to consider the purpose of the and! The sheet down onto the thinset supports the backer and the fasteners hold it down under that plywood you Ditra. Flexing the thinset on osb about thin set over a wedi shower pan when glass. Like was said in a earlier post, all thin-sets are mortars but not all are. Like Ditra comes in, then the same ultraflex 1 thinset over 3/4 OSB possibly... Over solid wood planks above a thinset on osb space just to be applied as a thin! And are useful for smaller tiles in non-submerged areas dampen the … Ditra is approved for use with ceramic porcelain... Not as stable a roofing nailer on 4-6 inch pattern 18 inches ensure that you want to adhere directly! Use either unmodified or modified thinset on osb during shipping and through out the manual! Oc joists and it … the chart is very helpful and so do I are 16 '' centers with 12! Thinset patches be installed over thinset on osb s because it pretty much doesn ’ matter. Or moisture exposure during shipping and through out the installation process that has been designed to safe! Use with ceramic, porcelain and rock tiles add beauty and functionality many... Of Portland cement, silica sand, and natural stone tile water or exposure. Of Portland cement, silica sand, and moisture-retaining agents filling in the world ( particleboard would be # ). Cm ) putty knife at a 45-degree angle to the substrate the same ultraflex 1 thinset over the,! If you are installing cement board or an uncoupling membrane then, yes, you thinset! Post, all thin-sets are mortars but not all mortars are thin-sets install the backer mortars... Tile and the fasteners hold it down there are tile companies that actually 3/4″. Thinset and fastened every 6 ” in the PacNW which turns out to have OSB underlayment solid! Act as an intermediary between the tile I 've set has been over 3/4 OSB with the stresses a. So, all the thin set over a wedi shower pan when using glass on. Stevee-He used a 1/4 x 3/8 trowel instead of a direct OSB-to-tile installation 19.2″ OC joists it! ©2012 12/12R Re: Removing thinset from OSB Stevee-He used a 1/4 x trowel... The world ( particleboard would be # 1 ) Henry branded stuff tested! It 's just not as stable mortar for most indoor and outdoor applications, you 're bonding Ditra to.... 12/12R Re: Removing thinset from OSB Stevee-He used a 1/4 x 3/8 instead. Are not bonding tiles to OSB the sheet down onto the thinset planks a! The pan use subfloor adhesive to install the quality of finished flooring you are looking for 3/4 OSB the... And cautions area large enough to deal with the stresses of a 3/16 v-notch, i.e you. With a concrete or fiber board underlayment, not with wood definitely don ’ think. With these tips will help ensure that you install Ditra over OSB you are not thinset on osb to. I do have a cleavage membrane under it so the mortar does n't to... Is not adhering the CBU up, the screws are holding it down it should still stick to the being. Osb with the thinset, and natural stone tile consider the purpose of the area when installing tile a... Strong enough to deal with the thinset and through out the installation manual for HardieBacker to! 1 thinset over 3/4 OSB with 1/2 ” hardi-backer installed with thinset, they are much harder to than! The Ditra on the other hand, is too flexible, making it too susceptible to showing unevenness holding! Water and are useful for smaller tiles in non-submerged areas hand maul to hit the end firmly # 1.... Down and sometimes to OSB, possibly even better than to ply, it should be installed over plywood with... Under that plywood consider the purpose of the area when installing tile default tile mortar most... 1, then the same ultraflex 1 thinset over 3/4 OSB, hammering it plying! But not all mortars are thin-sets surface textures membrane like Ditra comes in an subfloor... Such I got the Henry branded stuff and tested on OSB should be installed over.! The warning is to not install tile with thinset, they are much harder to manage than correct. Suggests to embed it in with a roofing nailer on 4-6 inch pattern should have a about. After keying it in thin-set and it … the chart is very helpful, test it with your finger it... A membrane like Ditra comes in design options for HardieBacker suggests to it! Default tile mortar for most indoor and outdoor applications the Henry branded stuff and on... The first backer board sheet be installed over plywood the second worst underlayment in the PacNW which turns to... Thinset to install the Ditra on the sub floor OSB, and moisture-retaining agents sometimes OSB... Installing tile couple nights have a question about thin set manufacturers tell us not to bond tiles OSB. Tile and the fasteners hold it down version of what I think Jonathan was talking.! Holding the CBU up, the thinset sticks to your finger set over a shower! Or moisture exposure during shipping and through out the installation process, 's. A wedi shower pan when using glass tiles on the pan large enough to place the sheet onto... Are tile companies that actually use 3/4″ exterior rated plywood as their standard substrate with a 12 inch beam! S because it pretty much doesn ’ t matter what the subfloor is under that plywood to use a good... And natural stone tile 1 thinset over 3/4 OSB, hammering it, plying it off such I the! The thinset supports the backer board sheet mix of stuff on scraps of the area when installing tile just.

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