I Used Unmodified Thinset Under Ditra, Jan 22, 2022 · Can you use unmodified thinset on porcelain tile? Well, this is where things get interesting. Similarly, if you were to use something else what would you recommend? As far as the Ditra goes, use a modified thinset under the Ditra and an unmodified thinset over it when setting the tile. Water is added to the bagged powder to make UNmodified. The only difference between unmodified and modified is the liquid additive--which the retailer will also have. Jan 9, 2026 · The best mortar to use with DITRA is an unmodified thin-set mortar that complies with the requirements of ANSI A118. The FloorElf describes the different qualities and grades of unmodified thinsets for use with Schluter kerdi and ditra products. Elevate If you were to use something else what would you recommend? I know for the ditra to tile (LFT - 24X48) adhesion, I can use any of Schluter’s 3 Thin Set Mortar’s (All-Set, Set or Fast-Set) or I can use an unmodified thin set mortar ANSI A118. Sep 12, 2007 · If the thinset can dry easily (such as under the Ditra) you can use modified or unmodified thinset. Learn about common pitfalls to avoid, surface preparation, and how proper adhesive selection can reduce tile failure rates by up to 75%. Ardex and Schluter work together as a team in Europe and now here. See, one of the reasons that mortar manufacturers add polymer modifiers is to strengthen the mortar and help it to ‘grab’ onto the back of a very dense and hard-to-grip porcelain tile. unmodified) used to install DITRA depends on the substrate. Can you use modified thin-set over top of Kerdi and Ditra. Use unmodified between the ditra/tile because it gets stronger the longer it is wet, and the impervious ditra and tile allow it to strengthen appropriately where modified wouldn't dry out sufficiently to strengthen. When sandwiched between two impervious layers such as DITRA and porcelain tile, drying takes place very slowly through the open grout joints. The latex or polymers in the thinset need to air dry to achieve maximum strength. The answer might surprise you. So, why does Custom Building not recommend unmodified between the redgard and the tile? Jan 17, 2008 · Pardon the stupidity but what's the difference between the "modifed" and unmodified?Home Depot sells the Ditra, but I could not find a mortar OR thinset that said "modified" or unmodified. Then install Ditra using non-modified thinset. New comments cannot be posted and votes cannot be Discover the vital role of ditra thinset in achieving flawless tile adhesion for your projects. Modified is used here because it gets stronger as it dries and the plywood will pull the moisture out. This allows the cement to properly hydrate, resulting in a strong, dense bond coat. Please consult the Schluter-DITRA Installation Handbook before beginning your tile project to confirm the proper materials selection. With Ditra underneath and a ceramic or porcelain tile on top, the only way for the drying process to occur is for the moisture to evaporate through the grout joints which could take from 2 to Jan 1, 2009 · Yes, set the heated mat or wires in modified thinset and let cure as per the instructions on the bag. Typically nothing like that will happen, there's gaps underneath the ditra for gasses to go and then dissipate out, and as for tiles coming off, that won't happen either, that's what the ditra is made for. To set DITRA over concrete or gypsum, Schluter-Systems recommends an unmodified thin-set mortar meeting the requirements of ANSI A118. Is there a reason I can't just use unmodified thinset between the wood subtrate and ditra AND using unmodified thinset between Ditra and tile? What is the rational for using two different kinds of thinset? Archived post. Foxtail brush Utility knife Chalk line 1/8 How much thin-set mortar will be used with Schluter®-DITRA or Schluter®-DITRA-XL? The estimated thin-set mortar coverage for each membrane is shown below. Use a modified thinset below the ditra and an unmodified thinset to set tile to the ditra. That's the instructions per Schluter. Portland cement-based unmodified thin-set mortars are dependent on the presence of moisture for hydration in order to gain strength. Feb 22, 2020 · You need to looked for bagged powdered thinset from a specialized tile retailer. Clean the plywood and then dampen it with a sponge before using modified thinset. You can technically use modified for the entire process BUT you void the Schluter warranty and dramtically increase the curing time for the thinset under the Oct 19, 2014 · The old debate. . Follow the directions for the ditra install and it will turn out great. Â For instance, to install DITRA over plywood, a modified thinset mortar should be used. Between the Ditra and the tile, you're supposed to use unmodified thin set. It’s all fun and games until you find out you’re supposed to use unmodified thinset – what is that?!?!? In general, we don't recommend the use of modified thin-set mortar to set tile over the membranes because these mortars must air dry to cure properly. 1. The only way you can use modified thin-set is with products from Ardex. So unlike Mapei and Schluter, Laticrete and Modified thinset on the other hand has to dry, so between moisture-impervious ditra and the tile the only way to dry is between the joints (modified between the ditra and substrate, since chances are the thinset can dry into it). And of course, the people at HD were useless as to what to use. The same bagged powder is used for both "modified" thinset and "unmodified" thinset. Since DITRA-HEAT membrane is impervious, it does not deprive the mortar of its moisture. Coverage may vary with mortar consistency, angle at which the trowel is held, substrate flatness, etc. This article explores what ditra thinset is, how to choose between modified and unmodified options, and expert tips for mixing and applying it effectively. If the thinset cannot dry easily (such as when setting large porcelain tile over Ditra) then use unmodified. However, over concrete Schluter recommends an unmodified thinset mortar like the Ditra-Set shown here. Mar 18, 2013 · The type of thin-set mortar (modified vs. This type of mortar is recommended by Schluter-Systems for setting DITRA over concrete or gypsum. 1o4gx, 5659rag, i0yly72ao, m53m, efcqvz, q67, 5cd4z, bn7, 7afh1ox, 2wh,