Skip to content

Can you use modified thinset on kerdi?

Kerdi is a waterproof membrane that is often used in showers. Modified thinset is a type of mortar that is used for installing ceramic tiles. It is a popular choice for many DIYers because it is easy to work with and doesn’t require a lot of experience. While modified thinset will work with kerdi, it is not the best choice.

No, you cannot use modified thinset on Kerdi.

What type of thinset do I use for KERDI?

It is important to use Schluter SET™, ALL-SET™, FAST-SET™ or an unmodified thin-set mortar to construct all KERDI seams in order to ensure watertight performance of the system. This will help to prevent any water infiltration and ensure that the system functions properly.

There are four types of thin-set mortars that can be used when setting tile over Schluter DITRA and DITRA-XL: Schluter SET, ALL-SET, FAST-SET, or an unmodified thin-set mortar meeting the requirements of ANSI A118.1. Each type of mortar has its own benefits and drawbacks, so it is important to choose the one that best suits your needs. Schluter SET is a versatile mortar that can be used in a variety of applications, including setting tile over Schluter DITRA and DITRA-XL. ALL-SET is a high-performance mortar that is ideal for large format tile and stone. FAST-SET is a rapid-setting mortar that is perfect for time-sensitive projects.

See also  What dissolves toilet paper?

Can I use modified Thinset over DITRA

Modified thinset is fine to use to adhere the Ditra to the plywood subfloor, however, the Schluter website specifies that unmodified thinset should be used to adhere the tiles to the Ditra.

Modified thin-set mortars are similar to unmodified thin-set mortars, but include additional polymers such as latex. The additional polymers are introduced in either liquid or powder form. This type of mortar is typically used for installation of tile in wet areas such as showers and tub surrounds.

Is Mapei Type 1 Thinset modified?

This is a great product for most tile installations, both inside and outside the home. It is a polymer-modified thin-set mortar that is easy to work with and provides a great finished look.

Schluter-Systems does not recommend the use of premixed thin-set mortars (mastics/adhesives) in any KERDI installation. The company believes that these products do not provide the necessary bond strength and may cause installation problems.

When should I use modified thinset?

Modified thinset is a type of adhesive that is used to adhere tiles to porous materials. This type of adhesive is made with latex or polymer additives, which makes it ideal for use on plywood subfloors.

Thinset is a type of mortar that is used for installing ceramic tiles. It is typically made from a blend of Portland cement, sand, and water retention agents. However, modified thinset includes additional retention products, such as latex polymers, which can increase its performance and strength.

Why is Schluter all set modified

Schluter Systems offers modified thin-set mortars that are designed to set and gain strength quickly, even when used in conjunction with Schluter membranes or boards. This makes them ideal for use with porcelain tile, which can be installed in a shorter timeframe than other types of tile.

See also  Will paper towel dissolve in the toilet?

This is important to note because it means that you can still use latex-modified thinset between the membrane and the subfloor, even though it is not impervious. This is because unmodified thinset should be used between the membrane and the tile.

Can I use uncoupling membrane mortar on Kerdi?

TEC Skill Set Uncoupling Mortar is a dry set mortar made for use with Schluter-DITRA uncoupling membrane and Schluter-KERDI waterproofing membrane. The mortar provides superior adhesion to Schluter membranes and substrates, and is specifically formulated to resist the cracking and crazing that can occur with traditional mortar due to differential substrate movement.

A non-modified or unmodified mortar is a cement-based tile mortar that does not contain any polymer. MAPEI’s Uncoupling Membrane Mortar is an example of a non-modified mortar.

Can I use modified thinset in a shower

If you are using Kerdi, it is best to use an unmodified thinset mortar. This type of mortar dries out to gain strength, whereas the Kerdi membrane inhibits drying, which can lead to unpredictable results. For example, if a shower is used before the mortar has cured properly, leaks and polymer leaching can occur.

We recommend using glass tile premium thin set mortar as it provides a strong bond between the tile and the surface. It is also resistant to water and mold growth.

How thick can modified thinset be applied?

A 3/16th thick tile set by the thinset method is adhered to the substrate with a thin layer of “thinset” cement. The terms thinset cement, thinset mortar, dryset mortar, and drybond mortar are synonymous. This type of cement is designed to adhere well in a thin layer – typically not greater than 3/16th thick.

See also  How does dual flush toilet work?

This note is to remind you that the product should not be used in exterior applications, steam rooms, shower floors or areas subject to water immersion. This is to ensure the longevity of the product. Thank you for your cooperation.


You can use modified thinset on Kerdi, but it is not recommended.

Yes, you can use modified thinset on kerdi, but it is not recommended. Modified thinset can be more difficult to work with and can cause the kerdi to not adhere properly.