Please consult your stone supplier and Schluter-Systems for more information. This is even more important to consider in exterior applications that are exposed to rain, as there is the additional concern of latex leaching.Įxception: Certain moisture-sensitive stones, e.g., green marble, or resin-backed tiles may require special setting materials. If extended cure times were not observed, the results could be unpredictable. Therefore, extended cure times would be required before grouting if using modified thin-set mortars between DITRA and ceramic tile, including porcelain tile. When sandwiched between two impervious layers such as DITRA and porcelain tile, drying takes place very slowly through the open grout joints. 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. This allows the cement to properly hydrate, resulting in a strong, dense bond coat. Since DITRA is impervious, it does not deprive the mortar of its moisture. Portland cement-based unmodified thin-set mortars are dependent on the presence of moisture for hydration in order to gain strength. (including porcelain) and stone tile over DITRA and DITRA-XL. Schluter-Systems requires the use of Schluter SET™, ALL-SET™, FAST-SET™, or an unmodified thin-set mortar meeting the requirements of ANSI A118.1 to install ceramic. What type of thin-set mortar should I use when setting tile over Schluter™-DITRA and Schluter™-DITRA-XL?
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