Polymer-modified cement based mortars such as Large Tile & Stone Mortar or Ultraflex LFT™ are generally recommended for installing tile over radiant-heat systems. Also, should you tape cement board joints? I’ve had mixed results when following Schlutter’s instructions verbatim, which calls for unmodified thinset. (20 x 20 cm). Keep in mind, that tiling board seams are not like dealing with drywall...it doesn't need to look pretty and the tape doesn't need to be embedded fully, it will be when you add the thinset and tile. Unmodified thin-set mortar must be used to construct all KERDI seams to ensure watertight performance of the system. https://www.rubi.com/us/blog/modified-or-unmodified-thinset The thinset and mesh tape are to strengthen the seams. The key is predictability. Pre-Mixed Thin-Set Mortar SimpleSet pre-mixed thin-set mortar is a SimpleSet pre-mixed thin-set mortar is a no-mix, no-mess alternative to traditional thin-set mortars . For example, a 3/8" notch trowel will produce a 3/16th inch thick coating after the tiles are pressed in to the cement. If you find a thinset you are curious about, and it is not on this list, look for that number. The walls and ceiling for the tub/shower are cement board. SimpleSet Gray 3-1/2 Gal. We utilized the same thin-set that will be used to attach the tiles. When installing KERDI with unmodified thin-set mortar over particularly dry and porous substrates, it is recommended to wet the substrate first, in order to help prevent premature drying or skinning of the thin-set mortar. x 8 in. Note: I intend(ed) to apply thin-set mortar directly to OSB, then install 1/4" cement board directly atop with screws then tape and trowel joints (using thin-set mortar), then apply 1x coat of RedGard to cement board, then apply polymer-modified thin-set atop cement board, and last install porcelain floor tiles. Schluter Systems’ modified thin-set mortars have been specifically formulated to set and gain strength in a timeframe that fits typical installation practice, even when sandwiched between Schluter® membranes or boards and porcelain tile. If you are going to tile over the cement board, you should tape the seams. Recommended to bond porcelain, stone, marble, granite and ceramic or porcelain tile up to 8 in. I used a mesh tape for high humidity/moisture areas, which comes as a roll with an adhesive side, and sheet rock joint compound, not thinset, for the gaps, screw holes and seams on the cement … For tile mortar we unsuccessfully tried Superior Adhesvive and Chemicals Pro Bond Non Sag Thinset … Refer to the written instructions of the radiant-heat manufacturer for cement-based mortar recommendations or contact MAPEI’s Technical Services Department at 1-800-992-6273. 2 Answers. The problem I have is that the unmodified thinset fails to completely adhere the Schlutter to the substrate (I usually install cement board under KERDI or Ditra). If it has A118.1 AND more numbers after that (with no mention of admix) then it is a MODIFIED thinset. Why would Schluter’s modified thin-set be ok to use, but not other manufacturers’ modified thin-set? But that is after I used premixed mortar (Simple Set Pre Mixed Thin-Set Mortar ANSI 136.1 Type 1 – non modified, I believe) when taping the seams/screw holes over the HardieBacker cement board. The terms thinset cement, thinset mortar, dryset mortar, and drybond mortar are synonymous. I've been adding a bedroom and bath to the basement. This type of cement is designed to adhere well in a thin layer - typically not greater than 3/16th thick. For instance, if it says on the bag that the product meets ANSI standards A118.1, A118.4 and A188.11 then it is a modified thinset.
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