Do you need cement board with KERDI membrane?

First Kerdi can be installed on drywall or cement board. However if installed on drywall it is only protecting one side. The back side of the drywall fails and it is just as bad or worse than if it had an issue on the tile side. All shower/tub areas should have concrete board (I prefer hardiboard).

What do you put under KERDI membrane?

The type of bonding mortar used to apply KERDI must be suitable for the substrate and must penetrate and engage the membrane fleece. For all the substrates listed in this Handbook (e.g., gypsum board, cement backerboard, etc.), Schluter SET™, ALL-SET™, FAST-SET™ or an unmodified thin-set mortar is recommended.

How much should a KERDI membrane overlap?

2”
Make sure that the second sheet of KERDI membrane overlaps the first by at least 2”—you can make sure this is accomplished by marking the sheet 2” from the edge. Alternatively, KERDI sheets may be butted and covered with KERDI-BAND waterproofing strips.

Which Thinset over KERDI membrane?

Schluter’s recommendation is to use unmodified thinset mortar when installing Kerdi over most shower substrates.

What can I use instead of Kerdi board?

Profoil is a cheaper alternative to Schluter Kerdi without sacrificing quality. It’s applied the same as Kerdi with both in and out corners available.

Do you need drywall behind Kerdi board?

Yes! In fact, it’s advised to use this product on drywall in your bathroom before laying tile and other materials. Without a waterproof membrane like Kerdi, water and moisture can seep through grout, tile and other materials and end up damaging wood studs and subfloor.

How much thinset Do I need to install Kerdi membrane?

Use one 50 lb. (22.68 kg) bag of mortar per 100 ft2 (9.3 m2).

What size trowel do you use for Kerdi membrane?

A 1/4″ x 3/16″ (6 mm x 5 mm) V-notched trowel or the Schluter™-KERDI-TROWEL is recommended.

How thick is Kerdi membrane with thinset?

8-mil thick
KERDI is 8-mil thick and has a water vapor permeance of 0.90 perms, when tested according to ASTM E96, using Procedure E at 90% relative humidity.

Is Schluter Kerdi worth it?

Great product. It takes a little longer than the traditional mud shower bed and water-proofing methods, but it is worth it. Took my old shower down to the studs and completely rebuilt it with DuraRock and then the Schluter Kerdi Shower Kit and 12×16″ tiles.

Can Kerdi membrane be installed over regular drywall?

Yes. Once you install KERDI over the drywall panels, they will be completely protected from the water and vapor in your tiled shower.

https://www.youtube.com/watch?v=amzB2UqTGfI