Therefore, it’s best to use unmodified thinset when working with an impervious installation membrane like Prodeso for installing radiant floor heating. It’s important to note that latex-modified thinset can still be used between the membrane and the subfloor because it is not impervious.

What’s the difference between thinset and modified thinset?

What is the difference between modified and unmodified thin-set mortar? Dry-set mortar is comprised mostly of cement, sand, and a water retention agent, and is also called unmodified mortar. Modified mortar contains a polymer which can improve the bond strength and add other properties.

What happens if you use modified thinset with 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. For example, if a shower is used before the mortar has cured properly, leaks and polymer leaching can occur.

What happens if you use modified thinset on DITRA?

Since DITRA is impervious, it does not deprive the mortar of its moisture. This allows the cement to properly hydrate, resulting in a strong, dense bond coat. 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.

Can I use unmodified thinset on drywall?

Thinset adheres to Sheetrock as well as any other surface, but you need to consider the purpose of the area when installing tile. Ceramic, porcelain and rock tiles add beauty and functionality to many areas of the home and give homeowners many design options. Thinset comes in two colors, white and gray.

What thinset is used for porcelain tile?

ANSWER. ANSWER – Porcelain Tile should be installed with a latex modified thin-set or a polymer modified thin-set. The Custom Marble Granite Mortar I believe is a polymer modified thin-set. For larger tiles 12×12 or larger should use a 1/4″ sq.

What thinset do I 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.

Can I use modified thinset on Schluter?

Schluter Systems’ modified thin-set mortars have been specifically formulated to set and gain strength in a timeframe that fits typical installation practice, even when sandwiched between Schluter™ membranes or boards and porcelain tile.

Is modified thinset waterproof?

Because they are waterproof, in case you would use modified thinset this will trap the moisture between the Kerdi and the tile. They say use unmodified mortar/thinset as it will cure or dry out properly (not sure why? Less water?)

Can you use modified thinset over redguard?

A person should use a modified thinset like Flexbond over Redgard, since the Flexbond modified thinset lists redgard as one of the surfaces it can be applied to.

Should I use modified or unmodified thinset for DITRA?

To set DITRA over concrete or gypsum, Schluter-Systems recommends an unmodified thin-set mortar meeting the requirements of ANSI A118.

Will unmodified thinset bond 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.

Can you use unmodified thinset over DITRA?

The Schluter website says it is fine to use MODIFIED thinset to adhere the Ditra to the plywood subfloor, however they specify UNMODIFIED thinset to adhere the tiles to the Ditra.

What thinset should I use for 12×24 tile?

You often hear about using “thin set” to install tile, but in the case of installing 12×24 tile as flooring, you’ll want to use something called “medium bed” mortar. The medium bed holds its consistency better than the thin set, which will sag a bit in the middle of the tile.

How thick should thinset be for shower walls?

In most installations, a layer of thinset 3/16 to 1/8-inch thick is sufficient. Too much thinset creates a mess and inhibits proper bonding between the tile and the substrate. For most tiles, apply a layer of thinset 3/16–1/8-inch thick.

What mortar should I use for shower tile?

Because thinset is not affected by moisture, it is best for floor tile and any tile in wet areas, including shower floors, walls, and ceilings and tub surrounds. Since thinset tile mortar may crack, you may wish to mix it with a special latex additive to increase its strength.