Mapei: Ultraflex 2 Porcelain Tile Mortar.Custom Building Products: Versabond Flex FlexBond. However, if you are installing Ditra then scroll down to the Schluter section below. Most manufacturers, including Custom Redgard Uncoupling Mat and Laticrete Stratamat, will want you to use an ANSI 118.11 118.4 or 118.15 mortar and the products listed below meet this standard. Installing uncoupling membranes over concrete Longer answer is: Cement board shouldn’t be installed over concrete Installing cement board over a concrete subfloor Rather, the system of a mortar bed underneath the cement board and fasteners above holds the material properly in place. However, it’s my understanding that the mortar doesn’t need to adhere to the plywood. Some manufacturers’ instructions say to use a modified mortar and you should follow those instructions. The good news is that, basically, any thinset mortar will work for this. Installing cement board over a wood subfloor
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