The problem is I only have enough room to install 1/4 ply over the existing subfloor. Flattening Osb Subfloor For Luxury Vinyl Plank Flooring According to the 2011 tcna guidelines youd want no less than 12 plywood over that floor properly attached to the joists only. Tiling over a plank subfloor. You can also use an uncoupling membrane over existing tiles or on a plywood subfloor, but Schluter Systems does not recommend using DITRA over existing hardwood, which is too smooth to grip the thinset. spacing of joists). Tile over osb subfloor floor. Large format natural stone needs a subfloor over twice as stiff as for wood flooring. I want to install 12" porcelain tile with ditra on our foyer. The wood is in good shape and the nails seem to hold well. Simply running the trowel over the ditra did that (photos 1 and 2). The same is true for other brands of decoupling membrane. If so, how thick? The area for this was cut out of the plywood underlayment, so the fiberboard was nailed directly into the plank subfloor. Installing tile over a wood subfloor is a lot easier today than it was when i started my remodeling career. Schluter Ditra and Redgard Uncoupling Mat are two popular brands of tiling membranes that lessen the chance of concrete events becoming tile events. 3. I have removed the 2 layers of linoleum, but there is still significant paper backing and glue that's not coming off of the plywood. 2. 2. I've already re-fastened the t&g planks to the joists to ensure they're solid using screws. Hoping for some advice on a ceramic tile installation over 5/8 plywood subfloor on the second floor of our 1974 split level house. If it is solid 2 x 6's then I would think the damage would be minimal. It is mortared to the DITRA underlayment, which in turn, is mortared to the subfloor. (Drywall screws are great for drywall but they're also very brittle.) Joists are 2X8, 16 in. While Ditra over cement board doesn’t make logical sense in most scenarios, there are some reasons you might want to go ahead and do both. The joists are 16" OC and the planks are around 1x6. I tore out tile over 1/4 ply, over stick down vinyl, over sheet vinyl, over MDF. Multiple layers of vinyl is unacceptable . We are preparing to remodel our master bathroom (ourselves) and I'm reviewing some subfloor options for tiling. You are treating this new plywood as your subfloor, you aren't counting the plank subfloor for anything in terms of deflection resistance strength. Description mapeguard um is a premium performance lightweight … If they need support, which is highly likely, then when the subfloor is open is the time to install it. Perimeter bonded vinyl tile is unacceptable. Yes, Schluter®-DITRA or DITRA-XL can be installed over vinyl. Has anyone ever laid the ditra membrane over the existing vinyl floor? The manufacturer says the XL is better. 2. Posted by 1 day ago. Schluter has updated their installation instructions to allow for alternate floor coverings to be installed over Ditra-Heat and Ditra-Heat DUO membrane. Flooring Over Plank Subfloor Whether or not you need plywood underlayment under engineered wood flooring depends on the condition of the original subfloor. The TCA-150 calls for 1/2" underlayment, but that's also assuming it's over a 5/8" plywood subfloor. joist spacing Floors, Interior - Natural Stone Tile Floors, Interior - Existing Vinyl Floors, Interior - Structural Plank Subfloor CONCRETE 8 Floors, Interior - Ceramic or Stone Tile • Young concrete See page 17 & 18 of the 2020 Ditra-Heat Installation Handbook. If you have a plywood sub-floor I'd guess that you'll remove a ply or two in various places when trying to remove the Ditra later on. Some limitations include the following: 1. Schluter Ditra 1/8" Underlayment 323sqft in Underlayments. Once I do that I'll have 3/4" to work with as that's the height of the original hardwood floors over the plank subfloor in the adjacent rooms. Ceramic Tile Installation with Schluter Ditra. I might as well screw the planks into the joists while I have it up and prep it before laying down the OSB. Normal application with just 3/4" I would squirt down some construction adhesive to the joists, lay the 3/4" layer and screw 8" on edges and 12" in the middle. I picked up my Ditra roll yesterday, and after reading the handbook that came with the roll (extensively), I found out that Schluter looks to be okay with laying Ditra on top of the existing Vinyl floor as long as an appropriate latex p.c. Re: Installing tile over diagonal solid subfloor Even if the 1x10 is a true 1" I don't believe it will be sufficient. For example: The extra layer can give you peace of mind that your tile won’t crack and that water won’t get through to your subfloor. I say 11.5-12 because I never took the whole floor up to measure, and the CONTENTS WOOD 4 Floors, Interior - 16, 19.2, & 24-inch o.c. This isn't a simple job. Ditra is a polyethylene uncoupling underlayment with a grid Ditra is an uncoupling membrane designed for ceramic and stone tile installations on floors. That'll leave room for the subfloor + tiles. In fact, nearly every bare substrate you find in a modern house would be considered an approved substrate – shiny linoleum is not one of them (Photo 3). As it stands now, we'll have 1/2" plywood underlayment over the 1x6 plank subfloor. That's necessary when attaching to sheet goods, but with your dimension wood floor you are only technically required 3/4" penetration. ... Upstairs i installed porclein tiles over Ditra on top of 1.125" plywood. DITRA is a polyethylene tile underlayment manufactured by Schluter Systems. We have the subfloor exposed now, and squeaking is pretty minimal. Can Schluter®-DITRA and Schluter®-DITRA-XL be installed over vinyl flooring? Joists are 11.5-12 footers; however, they do have some bearing on top of partition walls below. All good things! My plan had been to replace the fiberboard with 1/2 ply, and then do a ditra installation (1/4" modified thinset, ditra, 1/4" unmodified thinset) for some 12"x12" porcelain tiles (3/8" thick). You need an expert GC on this job who employs an expert tile mechanic. I 'm now down to the subfloor which is 1/2 ply. Photo 3. I never knew flooring took so much prep work. Walking on it is like concrete AND the Ditra will prevent cracking of the tiles and grout when the plywood expands and contracts. joist spacing 6 Floors, Interior – Natural Stone Tile 7 Floors, Interior – Existing Vinyl 7 Floors, Interior – Structural Plank Subfloor 8 Floors, Interior – Ceramic or Stone Tile 9 Floors, Interior – Ceramic or Stone Tile 10 Floors, Interior – Ceramic or Stone Tile 11 MOVEMENT JOINTS Placement guidelines and descriptions Consensus here is that the Ditra goes back to Home Depot, be it fear of the unknown, resistance to change or valid concerns. I purchased ditra which I intended to put down over the cement backerboard. Tile should be set over a subfloor and underlayment that together are at least 1 1/8 inches thick. Spread a layer of thinset on the floor using a 1/4-inch notched trowel. On all our jobs where we use Durock for floor tile we install 1-1/8" Advantech with joists 16" OC. Yes, alternate floor coverings may be installed over Schluter®-DITRA-HEAT or Schluter®-DITRA-HEAT-DUO. Close. 01-03-2015, 04:37 PM. It’s an uncoupling membrane that isolates movement between the subfloor and finished tile, preventing cracks over time. That pretty much leaves deciding on either 5/16" or 1/2" Durock. This combination will only make your floor 1/2" thick over the planks and will be as or more effective than 1/2" ply and backer. Not every situation encountered in the field will be covered in complete detail in the TCA guidebook. If your joists are 16" on center and you can use 5/8" plywood, you may end up as little as 1/4" higher than your hardwood. Then I went over the entire floor, countersinking nails, removing padding staples and filling any large gaps or unwanted holes with wood filler. In an old house, you'll almost certainly need to add a layer of plywood to the plank subfloor. OC. This is the key to preventing the transmission of the movement that is the main cause of cracking in tile floors. However, over concrete Schluter recommends an unmodified thinset mortar like the Ditra-Set shown here. Also complicating the issue is that the plywood was placed AFTER the baseboard, meaning that now that I've removed the baseboard, there is a 3/4" gap between the plywood and the walls. It was in random plank boards where that was felt. It’s also a waterproofing layer. Installing Tile Directly on Concrete Ceramic and porcelain tile are so frequently installed at or above grade level on a cement board underlayment or directly on plywood that it almost seems novel to install tile directly on concrete. Anyhow that is the point I am at now (cement board thin set on top of 3/4inch plank subfloor). On new wide-plank pine boards in a ca. We live in a late 1970s home in which the subfloor is .75" x 9.25" (actual dimension) planks WITHOUT tongue and groove. Possible Benefits of Installing Ditra Over Cement Board. Tiling over a plank subfloor. It provides uncoupling to prevent cracked tile and grout. My main question here is about how to secure to the joists. You're going to get some damage to the sub-floor trying to remove anything that is cemented to it. The Schluter®-DITRA-HEAT system is suitable for applications with engineered wood, vinyl, wood plastic composite (WPC), luxury vinyl tiles (LVT), luxury vinyl planks (LVP), stone plastic composite (SPC) tiles and planks, and laminate flooring. Another alternative is to resecure your plasnks to the joists, fasten a lyer of 3/8" ply over the planks and then use Ditra as your underlayment. And my '07 manual shows a lack of backerboard in the sandwich. CONTENTS 4 Floors, Interior – 16, 19.2, & 24-inch o.c. The joists were in really good condition and didn't have bounce noticeable or much deflection. Then, to minimize the height build up, you can do an uncoupling membrane like Ditra. I like that it is only 1/8" thick but its not my battle. Interestingly, tile installers have been using sand for thousands of years as a non-rigid layer of material between the substrate and the tile to prevent cracking. It is made of polyethylene creating a waterproofing layer protecting the substrate. I'm going to install 3/4" plywood underlayment over the original 3/4" thick x 3 1/4" wide t&g plank boards which are attached to 2" x 8" joists on 18" centers. Cushioned vinyl is unacceptable. Installing ditra over an approved substrate is much, much easier. cx. Use a construction adhesive like PL400 and real wood screws. Thank you for the replies! I'm in the process of gutting my house and plan to install engineered hardwood over plywood, on top of the existing diagonal plank subfloor. Butting the ends of the plywood at the quarter-point span is still recommended? There was also a metal ember strip under this board. Foxtail brush ; Utility knife; Chalk line; 1/8″ notched trowel; Flat trowel; Grout float; Buckets (for mortar) Corded drill & mixing paddle; How to Install DITRA. For instance, to install DITRA over plywood, a modified thinset mortar should be used. I believe he needs to beef up the sub-floor with 1/2" ply screwed/glued down over … Glue and screw this underlayment in place. Our bathroom had hardwood flooring, and you can’t lay Ditra directly on top because solid wood shrinks and swells with temperature and humidity changes. Then DITRA over the top, and lay your tile. Or Ditra over structural plank subfloor (but that still calls for 24" o.c. is used that works with vinyl. Simply running the trowel over the ditra will not do this. The underlayment will be Ditra. The linoleum was glued to 3/4" plywood over a plank subfloor. Over plank subfloor the same is true for other brands of decoupling membrane Schluter®-DITRA-XL installed. 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