In this case, you would use an A118.4 mortar such as: Ditra products over a plywood subfloor.When installing a Kerdi Shower, Ditra uncoupling membrane, or Ditra-Heat they want you to use Schluter’s own branded tile adhesive mortars such as: Thinset Mortar for Schluter Products like Kerdi and Ditra Kerdi users: See the next subheading below TEC: Ultimate Large Tile Mortar 3N1, Ultimate 6 Plus.Mapei: Large Tile & Stone Mortar Ultraflex LFT, Ultralite.Laticrete: Tri-Lite 4-XLT, 255 Multimax Lite.Custom Building Products: Versabond LFT Prolite.Large tile (at least one side is 15-inches or longer) over waterproof membranes on walls in wet areas like showers (note: includes waterproof foam boards such as Wedi and GoBoard) Large tile (at least one side is 15-inches or longer) over uncoupling or crack-isolation membranes (CIS) TEC: Ultimate Large Tile Mortar 3N1 Uncoupling Membrane Mortar*.Mapei: Large Tile & Stone Mortar Ultraflex LFT, Kerabond T*.Custom Building Products: Versabond LFT Natural Stone & Large Tile Mortar, Prolite.Large Tile (at least one side is 15-inches or longer) over concrete or cement board Now for the tile adhesives that are specifically for large format tiles. Kerdi users: jump to the Schluter section below Large Tile Thinset Mortar (LFT, LHT, etc) TEC: SturdiFlex SturdiLight 3N1 Ultimate 6 Plus.Mapei: Ultraflex 2 Porcelain Tile Mortar Ultralite.Laticrete: 253 Gold 254 Platinum Tri-Lite.Custom Building Products: FlexBond Versabond Flex Prolite.Tile under 15-inches over waterproof membranes on walls in wet areas like showers (note: includes waterproof foam boards such as Wedi and GoBoard) TEC: Sturdi Flex Full Flex, Uncoupling Membrane Mortar*.Mapei: Ultraflex 2 Porcelain Tile Mortar, Uncoupling Membrane Mortar*.Uncoupling membranes such as: Flexbone, Stratamat, Mapeguard UM, Redgard and CIS membranes like Nobleseal CIS Tile under 15-inches over uncoupling or crack-isolation membranes (CIS) TEC: Full Set Plus*, Sturdi Flex Full Flex.Mapei: Kerabond*, Floor Tile Mortar*,Ultraflex 2 Porcelain Tile Mortar.Laticrete: 253 Gold 254 Platinum, 272*.Custom Building Products: Versabond, Versabond Flex FlexBond.Kerdi users: scroll down to the Schluter section below Sheet membranes such as: Hydro Ban Sheet Membrane, Ardex SK 175, Mapei Mapeguard WP 200, Redgard Fabric Membrane, Wedi Subliner Dry Most manufacturers want a modified mortar used to install their waterproof sheet membranes. Thin, waterproof sheet membranes over backer board Specific products include:ĭitra users: scroll down to the Schluter section below Installing an uncoupling membrane over a wood subfloorįor this, you want to use a thinset mortar meeting ANSI 118.11 and it should have this number on the label.ĪNSI 118.11 means it’s approved to go over exterior grade plywood. 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 How to mix thinset is covered in a separate post as is mixing small batches of thinset.Schluter products are their own thing and are mentioned in their own category below.These brands are typically found in retail stores.Which thinset mortar do I buy?”īelow is a list of products and applications. Always read and follow the manufacturer’s instructions on the product(s) you are installing. ![]() It’s up to you to make sure the product that you are using is proper for the application. What’s the difference between white or gray thinset? What is unmodified mortar?ĭisclaimer: This post is to be used as a general guide for mortar selection.
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