There is no problem with adherence of modified or unmodified thinset to each other in general.

Can you put modified thinset over unmodified thinset?

It's important to note that latex-modified thinset can still be used between the membrane and the subfloor because it is not impervious. However, unmodified thinset should be used between the membrane and the tile. ... Please contact WarmlyYours for details if your tile manufacturer requires the use of modified thinset.

Can you mix modified and unmodified thinset together?

Unmodified thinset has been around forever. ... More than that, you don't have to mix some types of modified thinset with water before spreading it out on the subfloor. That translates into less work for you and sturdier concrete for the client.

Can you use modified thinset over Kerdi?

In general, modified thin-set mortar is not recommended to set ceramic and stone tile, including large format tiles, over the KERDI membrane. Modified thin-set mortars must dry for the polymers to coalesce and form a hard film in order to gain strength.

Can thinset bond to thinset?

You can put new thinset on top of old, but only if the old thinset is perfectly smooth and level. ... Use a floor grinder and pass it back and forth over the old thinset until it is perfectly smooth and level. You can now tile directly on top of it as if it were a new surface.

Modified Thinset vs Unmodified Thinset Explained, How to Choose Best Mortar for Tiles

45 related questions found

Can you do two layers of thinset?

You can flat trowel the low area with same thinset you already have. Work at another edge. I like to start with a full piece at tub.

How thick can thinset be under tile?

How Much Thickness Should You Allow for Thinset when Tiling? Plan for a layer of thinset 3/16-inch to 1/8-inch thick beneath your tile. A 3/16-inch layer of thinset will be enough for tiles with a smooth back to bond the tile to the floor or backer board.

What if I use modified thinset on Kerdi?

Modified thinset mortars aren't recommended for use with Kerdi because they must dry out to gain strength, whereas the membrane inhibits drying, which can lead to unpredictable results. ... Schluter's recommendation is to use unmodified thinset mortar when installing Kerdi over most shower substrates.

Can I use modified thinset with Schluter?

Schluter-Systems requires the use of Schluter SET™ , ALL-SET™ , FAST-SET™, or an unmodified thin-set mortar meeting the requirements of ANSI A118. ... 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.

Which Mapei Thinset is unmodified?

Keraset: This is Mapei's mid-range unmodified.

Will unmodified thinset stick to painted drywall?

Thinset bonds best with a porous surface, such as new drywall or backerboard, which needs no preparation, but you can apply it over painted walls or tiles that are flat and in good condition as long as the shiny finish is removed.

Does unmodified thinset stick to plywood?

Thinset is the wet base that you first trowel on the plywood to make the tile stick. Higher latex content is essential for bonding to plywood. A quality unmodified thinset should be used and mixed with a latex additive.

How long does modified thinset take to cure?

With most kinds of thinset, it's generally advisable to wait at least 48 hours after application before walking on or applying pressure to the tile. Manufacturers often recommend allowing a window of 24 to 48 hours for curing time, and in this case, longer is better.

Can you use modified thinset over RedGuard?

Good day, I will be picking up my ceramic wall and floor tiles today to begin my shower. I have installed Denshild board with two coats of redguard as waterproofing. My question is what thinset is required for installing tile over top of Redguard?

Can I use RedGuard with kerdi?

Can you Redgard over Kerdi? No, it won't interfere with the performance or adversely effect it. RedGuard is not harder to adhere to. There is no reason to use both products although it can be easier to use the RedGuard in corners and niches without the build up you can get with kerdi.

Can you use Schluter all set for Kerdi band?

Schluter ALL-SET® is suitable for use with ceramic, porcelain, and stone tile, including large and heavy tile, in conjunction with Schluter®-Systems' uncoupling and waterproofing membranes (e.g., DITRA, DITRA-HEAT, KERDI, etc.), the Schluter®-Shower System, and KERDI-BOARD.

Can I use unmodified thinset under DITRA?

To set DITRA over concrete or gypsum, Schluter-Systems recommends an unmodified thin-set mortar meeting the requirements of ANSI A118. 1. Please consult the Schluter-DITRA Installation Handbook before beginning your tile project to confirm the proper materials selection.

Is Schluter all set polymer modified?

Schluter ALL-SET™ is a mixture of cement, sand, polymer and additives that sets and gains strength through cement hydration and polymer film formation when mixed with water. ... Schluter ALL-SET™ meets or exceeds the American National Standard Specifications for Modified Dry-Set Cement Mortar, ANSI A118.

What Thinset do you use with Kerdi?

Schluter SET™, ALL-SET™, FAST-SET™ or an unmodified thin-set mortar must be used to construct all KERDI seams to ensure watertightperformance of the system.

Is Mapei premium mortar modified?

Polymer-modified, cement-based mortars such as MAPEI's Large Tile & Stone Mortar are generally recommended for installing tile over radiant-heat systems. Refer to the written instructions of the radiant-heat manufacturer for recommendations of cement-based mortars.

How long should Kerdi dry before tiling?

Wait 24 hours after the membrane (i.e., Schluter®-KERDI-BAND and Schluter®-KERDI) installation is complete to allow for the final set of the mortar and to ensure waterproof performance of the assembly at seams and connections before water testing.

Is back buttering tile necessary?

Although not necessary for tile coverage, back buttering can be effective by increasing the bond of the mortar to the back of the tile which is an excellent benefit.

What happens if you use too much thinset?

When the mortar isn't properly troweled, it creates unsupported space under the tiles which become weak spots that can be easily damaged by the same impact or heavy loads. The best way to avoid these issues, avoid tile breakage, and create a strong tile assembly is to follow the following three steps.

Does thinset shrink when curing?

Answer: It is recommended to use a medium-bed mortar when installing large format tile to compensate for irregularities in the tile and substrate. Common thin-set mortars shrink as they cure — the displacement of water causes the mortar to retract and pull the tile as it hardens.