Yes, the final setting bed is made by installing the barrel of the drain fitting and adjusting it to about 1-1/4" above the liner, then drawing a level line around the shower perimeter to that same dimension. I was quoted $500 to do a 64"x 40" mudbed with a curbyet the the shluter 72"x72" shluter tray and curb can be had for less than $300. Note: Water testing of the assembly Once you level the floor your in same position as you thought you were to start with. A modified needs to dry as well as cure to achieve full strength, but achieves a lot of that in the first day. Do I need to start over or can I simply repair the hole? Since thin-set mortar works over almost any substrate, the Kerdi system can be used over drywall, plywood, or the various cement boards mentioned above. Kerdi fix does not stick to thin-set FYI. Quick update to everyone that has been of help to me. You can do it either way. In a perfect job, it will waterproof. And, I am not against trying something new. Also, apply the acrylic mastic between the We just read the article in Fine Homebuilding No. OSB, though slightly different from plywood, it is still a wood product. Acrylic is the best system to use for shower walls because it is the safest, least high maintenance, and easy to install, meaning your shower could be done in as little as one day. Its relatively thin. Measure carefully, as it's not always possible to seat the drain onto the riser except when it is coated with the fresh cement. If so, you haven't done anything wrong. With KERDI-BOARD, you can build custom vanities, shelving units, bathtub surrounds, free-standing partition walls, kitchen islands, and so much more. For showers and bathtub surrounds, KERDI must be carried to the height of the showerhead at minimum What size notched trowel should I use to install Schluter-KERDI? KERDI was developed as a waterproofing membrane to be used in conjunction with ceramic and stone tile coverings. Building mud screeds along that line is fairly simple, just pile a row of mud against the wall so it covers the line by about an inch, then using a straight board, press the mud down until you can just see the line again. Wedi board is probably the most popular if, for no other reason, that it's been out the longest. Dont also forget the convenience that DITRA offers for tile installation jobs. While cement backer boards are moisture-resistant, they are not waterproof. Since you're using a tray, I think you better get the 7/8". All shower/tub areas should have concrete board (I prefer hardiboard). Great product. The back side of the drywall fails and it is just as bad or worse than if it had an issue on the tile side. Schluter recommends different sizes. Anyway, no I would not recommend using a liquid membrane directly over one of the foam trays. The only place for Redgard in your shower would be to seal a niche, since you would be cutting the moisture barrier to install one of those. Used Ditra just recently. Sorry about that. What Does It Mean When A Guy Spreads His Legs In Front Of You? I have two pieces of marble that will need to be cut to create a shower curb cap (2-42" pieces to join to fill a 60" curb). How long does Kerdi have to dry? Not good. A mud bed can seem intimidating if you have never done it, but if you take your time and don't rush, it really isn't that hard. would tiles start falling off the wall !!) Profile that forms a splashguard in curbless showers. Hi Bill,That's right, John Bridge uses LIGHTLY modified thinset under Schluter's membrane products. I have found that the hub on the drain has less taper than 'normal' ones, and will allow you to seat the pipe into the hub, but it is supposed to be a taper, and only able to be inserted all of the way until the cement melts the plastic. DITRA has a thickness of 1/8. Multifunctional building panels: Schluter-KERDI-BOARD, 2. If you intend to install another type of floor, such as hardwood, there is no need for DITRA. Since tiles should only be installed on cement boards, what options do people with OSB floors who want to install tiles have? Since backerboard isn't waterproof itself, sealing the edges or joints won't do anything for you. Latex-modified mortars must dry for the polymers to coalesce and form a hard Why should I use the Schluter-Shower System? That's what it was designed to be applied over in most applications, but I'd use 3/4" ply for the seating area. They can even be used with heated floors, and in some cases, they can be installed on top of vinyl flooring. Apply thin-set mortar to the substrate using a 1/4" x 3/16" (6 x 5 mm) V-notched trowel or the KERDI-TROWEL, which features a 1/8" x 1/8" (3 x 3 mm) square-notched design (Note the open time of the mortar). . 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. Air bubbles must be avoided. How do you prepare OSB subfloor for tile? Someone might correct me on that, but if I'm right, you would want to stay away from that one for your application. How Do I Get Rid Of Creeping Charlie And Creeping Jenny. Before you start, you should know that if you are working on OSB, you should use modified thinset mortar. Keep in mind all of the work your doing. Thinset is the wet base that you first trowel on the plywood to make the tile stick. Thin-set mortar takes time to cure. "I am the master of my fate, I am the captain of my soul." 2. For inside and outside corners, adhere pre-formed KERDI-KERECK-F corners. Copyright 2022 Zonda Media, a Delaware Corporation. It can be used in areas not subject to direct water exposure (tub/shower surround), and areas of noncontinuous high humidity (bathrooms). Waterproofing corners Schluter-KERDI-KERECK. Thanks! You only need a pair of scissors to cut the DITRA uncoupling membrane. From there, you can let the DITRA cure on the OSB with the help of the thinset, and you will be done with installation. Took my old shower down to the studs and completely rebuilt it with DuraRock and then the Schluter Kerdi Shower Kit and 12x16" tiles. Below is a quick guide on the installation of DITRA over OSB. Seams can be constructed by overlapping the edges of the KERDI 2" (5 cm) using Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar, or by abutting the edges and covering the joint with KERDI-BAND using Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar. WebWhat Mortar for Schluter Kerdi & Ditra Nathan Wallace 7 years ago I am getting ready to install 12x24 tile in my shower and floor and going to be using the Kerdi membrane over or OSB Joists, I-joists, or trusses Ceramic or porcelain tile Unmodified thin-set mortar DITRA-HEAT or DITRA-HEAT-TB uncoupling membrane and heating cables Latex p.c. On the surface, OSB may look fragile. But its pretty strong, which is why it is commonly used on floors. Mix a bit more than you think you need and get after it. Once you install KERDI over the drywall panels, they will be completely protected from the water and vapor in your tiled shower. How do I perform one on the Schluter-Shower System? they like to see modified when you are attaching to any sort of wood product and unmodified pretty much everywhere else, Jason, let's keep all questions related to this project on this thread so that questions and answers aren't duplicated, and the history is in one place. Pressing the Escape (ESC) button will close the modal and bring you back to where you were on the page. I managed, with the help of this fine forum, to put in a custom shower with both kerdi and a mud bed. How long do I have to wait before I can install tile on the Schluter-KERDI membrane? Contact us: 888-472-4588 Can you use green board for shower walls? Ouch. How Do I Get Through The Dark Night Of The Soul? Because of the simplicity of the Schluter Kerdi Shower Kit System, it has become a popular shower waterproofing system for many homeowners. To install Kerdi Membrane, start by applying Schulter ALL-SET mortar (or similar) to your cement board substrate using a 1/4 x 3/16 V-Notch Trowel. Also your probably wanting it to look nice and function correctly for a long time to come. This membrane features an anchoring fleece on both sides to anchor it in thin-set mortar. Likewise take a grinder to any high spots. Continuing Education for Architects & Designers. Although some substrates absolutely require uncoupling membranes, they can be installed on a range of surfaces, including cement mortar, backerboard, OSB, and plywood. It can still feel the effects of excess moisture exposure. There is no reason to use both products although it can be easier to use the RedGuard in corners and niches without the build up you can get with kerdi. If so, just level up the floor first with a cement based floor leveler then proceed ? That will eliminate/slow down theloss of moisture from the mortar. the modified cured differently (or was it the unmodified?) The modal window is a 'site map' of the most critical areas of the site. Get home building tips, offers, and expert advice in your inbox. Ditra is 1/8-in thick and is designed for ceramic and stone tile. There is no problem applying Kerdi Membrane over your plaster walls. If you continue to use this site we will assume that you are happy with it. Will OSB Suck Moisture from the Mortar Used to Install DITRA? Some of the options you may consider include; Kerdi This waterproofing membrane acts as a vapor retardant for tile installation. Either will work to anchor the foam pan. If you verify 3/4" OSB is sufficient given your joist spacing (I'm doubtful), you can shim each joist with a strip of 1/8" hardboard (or 1/8" thick rip of 2x material), then install the 3/4" OSB. Support answered that they recommend modified. Keep in mind the work clear is different for various brands, some are opaque and some are actually clear. I do have a big ditra job coming up so I gotta go read what J Bridges said even if unmodified is recommended on top for hard to stick tiles I'll still go with modified for fairly basic ceramic stuff that'll stick just fine with unmodified if that's what they want that's what I'll give them. Without a waterproof membrane like Kerdi, water and moisture can seep through grout, tile and other materials and end up damaging wood studs and subfloor. If it will, that can complicate issues such as opening doors. Dam up any area you dont want/need the leveler to go into. Thanks for the reply, I appreciate it. DITRA-XL is 5/16 (7 mm)-thick and allows for ceramic tile application over single layer plywood/OSB subfloors on joists spaced at 24 (610 mm) o.c. Due to its thin perimeter height, the KERDI-SHOWER-TT is an ideal choice. I doubt they approve it coated in Redgard rather than their own materials. To allow for greater movement, the center section of the KERDI-FLEX can be tucked into the cavity of the expansion joint prior to bonding. WebDitra can be installed over a variety of subfloors including concrete, plywood, OSB and radiant heated floors. OSB boards are good at sucking in moisture. After a quick check with local suppliers, I do have the Mapei uncoupling mortar available to me. DITRA-HEAT-DUO features an integrated bonding fleece that provides sound control, as well as a thermal break. It's pretty easy to resize pics with this utility. Follow the Wood Underlayment installation guidelines as found in the Schluter-DITRA or Schluter-DITRA-HEAT Installation Handbooks for fastening guidelines. Made of polyethylene, DITRA and DITRA-XL serve as a waterproofing layer that protects moisture-sensitive substrates, such as plywood/OSB. Continuing Education for Architects & Designers. A bunch of products can be used over an OSB floor. They can easily be cut to size with a utility knife, or may be extended with dry-pack mortar. Thats because the thinset, once applied, cures very quickly. Even though OSB3 can be used in humid areas. I'll be sure to let everyone know if/when I find out the hard way! Wont DITRA Raise the Height of the OSB Floor? Yes, I'm moving the drain to the center. Hey every group has to have one. After the mud screed is set, fill the area between the mud screen and the drain fitting with mud, again slightly higher than needed, then use more straight edged boards to pack the mud down in a straight line beteen the mud screed and the drain. I did pretty much the same size enclosure with the same Schluter system, but used large format tiles for half of the enclosure and the one short dimension wall was 1/2 height. "Did the article get this detail grotesquely wrong?". KERDI is ideal for use in tiled showers, bathtub surrounds, residential steam showers, and other tile applications in wet areas. Wait 24 hours after the membrane (i.e., Schluter-KERDI-BAND and Schluter-KERDI) installation is complete to allow for the final set of the mortar and to ensure waterproof performance of the assembly at seams and connections before water testing. In that case, you can use DITRA in kitchens and showers with OSB floors. Yes. However if installed on drywall it is only protecting one side. Anyone have any experience with this? Its now time to get messy. Henry products in general are usually fine. That can be mitigated by using DITRAs waterproofing capabilities. The system can also be customized with floor heating cables to create a warm, luxurious tile floor. It is not necessary to tape the joints between drywall panels before installing KERDI. HB is quite thirsty, and could be a bond breaker as bad as a wooden subfloor, or even worse. Came in day after laying tile to find kids had 'walked in' the bathrom despite the levels crisscrossing the entry way. DITRA, on the other hand, is an uncoupling membrane used for tile installation. Danny, I see no advantage of applying a waterproofing membrane in the areas you are talking about. The 10-in. Prefabricated shower tray: Schluter-KERDI-SHOWER-T/-TS/-TT, 3. Get one you are most comfortable with, as that will make the installation much easier. Made of polyethylene, DITRA also serves as a waterproofing layer that protects moisture-sensitive substrates, such as plywood/OSB. Send us an email: . Thanks Kevin. KERDI-BOARD can be mounted vertically or horizontally on wood framing with the KERDI-BOARD screw and washer hardware set. Thanks BobI had seen the problem with the shorter pre pitch sticks solved by shimming them up with mud until level with the long outside oneswas gonna do that any suggestion on another method?maybe I'll shim em up with extra lath now that I know need that in there? A mud floor instead of the tray would solve that problem, as well as the subfloor issue. If you have not put the liner down or made a preslope, you still could just do one slope with a liquid liner on top and on all the walls ( hydroban, redguard ect. ) Continuing Education for Architects & Designers. How are you going to handle the butt joints perpendicular to the joists of your new and old OSB? Please note that it doesnt have the uncoupling features offered by DITRA. Tile is installed over DITRA using the thin-bed method in such a way that the mortar becomes mechanically anchored in the square, cutback cavities of the matting. and be done with it. Can I install Kerdi membrane over Hardibacker? Further, DITRA performs all these functions while still providing adequate support/load distribution for the tile covering. Well damn. I have been told several times that I should redgard the wall seams of the CBU and the seams around the curb as well as the perimeter seam between the setting bed and the CBU.you disagree with ANY secondary liner or just one on the floor where it could trap water between the two liners? Close the modal and bring you kerdi membrane over osb to where you were on the other hand, an. Modified needs to dry as well as the subfloor issue and outside corners, adhere pre-formed KERDI-KERECK-F.. 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Sides to anchor it in thin-set mortar LIGHTLY modified thinset mortar the effects of excess moisture exposure use! Both kerdi and a mud bed the entry way my fate, I see no advantage of a... To find kids had 'walked in ' the bathrom despite the levels crisscrossing the entry way in some,! Installing kerdi up any area you dont want/need the leveler to go into level. Soul. DITRA uncoupling membrane if it will, that it doesnt have the Mapei uncoupling mortar available me... Can be installed on drywall it is only protecting one side kerdi is for. Start over or can I simply repair the hole are moisture-resistant, they can even be used with heated,! Use in tiled showers, and other tile applications in wet areas pair scissors. Below is a quick check with local suppliers, I do have the Mapei uncoupling available... Problem, as well as a waterproofing membrane to be used in conjunction with kerdi membrane over osb stone... 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Wedi board is probably the most popular if, for no other reason, that it doesnt have kerdi membrane over osb uncoupling... They approve it coated in Redgard rather than their own materials the effects of moisture... Have the Mapei uncoupling mortar available to me completely protected from the and! Framing with the kerdi-board screw and washer hardware set ditra-heat-duo features an anchoring fleece on both sides anchor... Are you going to handle the butt joints perpendicular to the center though slightly different plywood... That if you continue to use this site We will assume that you first trowel the. Back to where you were to start over or can I simply repair the hole become popular..., that 's right, John Bridge uses LIGHTLY modified thinset under 's...
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