New screeds as they dry will shrink up and or expand expand All the above are instances where you might use a membrane, they are all instances where movement can crack your finished tile surface. About 110 square feet. Thanks in advance! I am tiling over concrete and plan on concrete/modified/Ditra Duo/unmodified/tile. I eventually want to lay ceramic tiles and I don't want to use ditra, I simply want to lay them over the concrete. Wood will expand and contract as it warms and cools separating at joints. (The concrete has no cracks, no chance of moving as it is 70 years old.) Click to see full answer. 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). I assume the self leveler is considered a concrete and I should use an unmodifyed mortar to install the ditra? I will be putting ditra on top of it and 12x24 marble over that. How it works - “There is nothing wrong with tile laid directly on concrete providing all precautions are taken regarding moisture proofing,” he says. I have a few questions I want to be clear on before I do anything as the marble is very expensive and I am not interested in cutting any corners. The best part is that it solved my issue of heat loss through the cold concrete floor. Yes, writes Doug McEvers, Ditra will insulate the concrete slab from the tile and lower the potential for thermal storage. Floors over boarded with ply wood. 2. It is shiney at parts, and some parts have worn out. tile over concrete subfloor – smooth out air bubbles and corners Use a grout float to put pressure on top, smoothing out any air bubbles to the corners. The DITRA-HEAT-DUO has fleece liner that results in a 70% faster floor warming response time. Herein, should I use Ditra over concrete? The Schluter-DITRA-HEAT-DUO membrane is 5/16″ (8 mm)-thick, [compared to DITRA-HEAT at 1/4″ (5.5 mm)-thick]and has 4 Benefits: Although tile can be placed directly over a concrete slab, products such as Schluter’s Ditra are designed to separate, or “uncouple,” the tile from any potential movement in the substrate and protect the tile and grout from cracking. Schluter®-DITRA is a polyethylene membrane with a grid structure of square cavities, each cut back in a dovetail configuration, and an anchoring fleece laminated to the underside. Correspondingly, can you use Ditra over cement board? Installing ditra over an approved substrate is much, much easier. While there are thinsets that ‘say’ they will bond to linoleum (and some of them will) apparently the jackass who installed that particular floor was not aware of that. Similarly, what mortar do I use with Ditra? Especially new concrete in a large area. To set DITRA over concrete or gypsum, Schluter-Systems recommends an unmodified thin-set mortar meeting the requirements of ANSI A118.1. For example, to set DITRA over plywood or OSB, a modified thin-set mortar meeting the requirements of ANSI A118.11 is used. The $3k is irrelevant since it must be a large area. If the Ditra will cost 3k installed, the rest of the tile work must be worth 15-20k, so I wouldn't take … Ok shack December 17, 2017 ... Not sure if enough force was used to get a solid layer of thinset into the Ditra Heat mat so there was not any voids/air spaces under the tile. Primarily because cement board is heavy, adds height to your tile installation, and needs to be waterproofed.DITRA has been out for a long time and most professionals use it because it will prevent tile from cracking, it will be easier to install, and it will lessen the height between your tile adjacent flooring. So basically use unmodified thinset for tile over concrete, not concrete board but concrete itself. Trying to save $3000 :)) Should you use the unmodified to fill the waffles and then another unmodified to tile? Going to use ditra / kerdi on a dry solid concrete based exterior terrace in South of France to act as decoupling membrane and waterproofing membrane as the terrace is over a garage. Having read the ditra website info they recommend un modified adhesives only as modified adhesives would apparently take ages to dry. Tile can contribute thermal mass to a passive solar house, and to Christa Campbell it would make a more appealing finish floor than concrete. My basement concrete floor is painted with what I assume is some type of concrete paint. I would use some kind of membrane, Ditra being my first choice. Schluter DITRA-HEAT-DUO Benefits.
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