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How do you install a Kerdi membrane on a shower floor?

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Asked By: Fermi Lubke | Last Updated: 14th June, 2020
Apply the orange Kerdi sheet to the wall. Use a screet to remove the excess thinset. Apply the Kerdi in the corners and on the niche. Apply the Kerdi to the shower floor.





Beside this, how do you install a Schluter Shower membrane?

Apply thin-set mortar to the substrate using a 1/4″ x 3/16″ (6 x 5 mm) V-notched trowel or the KERDI-TROWEL, which features a 1/8″ x 1/8″ (3 x 3 mm) square-notched design (Note the open time of the mortar). Press KERDI fully into the bond coat.

Similarly, do I need a vapor barrier behind Kerdi? Kerdi is the vapor barrier, there is no need for anything behind it. Kerdi can even be installed over drywall. Cement board and grout are not water proof, if there’s Kerdi no moisture is ever going to be able to get behind it. The weak points in the system are always in the corners where one wall meets another.

Just so, can you use Kerdi membrane on floor?

If your bathroom floor is a concrete slab, you could use Kerdi. Kerdi is a waterproofing membrane, so you can use it on any surface that is already suitable for tile.

How long does Kerdi have to dry?

24 hours

Can you install Kerdi membrane over drywall?

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

How much does Kerdi membrane cost?

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How much is the Kerdi shower system?

Worth the effort though. by SCHLUTER SYSTEMS L.P. I have been doing custom tile installations for more than thirty years. About ten years ago I first heard of, and started using the Schluter Kerdi Shower System.



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Do you need Kerdi over Cementboard?

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 is the best waterproofing membrane for showers?

Paint On Liquid Waterproofing Membranes
  • Redgard Waterproofing Membrane by Custom Building Products: As I have already mentioned, Redgard is the most popular and the most talked about liquid waterproofing membrane out there.
  • Mapei Mapelastic Aquadefense:
  • Laticrete Hydro Ban:

How thick is Kerdi membrane?

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. KERDI-DS is 20-mil thick and features additives to produce a water vapor permeance of 0.18 perms.

Do I need an uncoupling membrane?

Uncoupling membranes are invaluable if you anticipate any movement or cracking from the concrete floor. Generally, it is well worth the cost and the time to purchase and install an uncoupling membrane. Uncoupling membranes are not perfect, though.

Is Thinset waterproof?

As Jason described, thinset itself isn’t waterproof. It isn’t degraded by water, and does resist the flow of water (somewhat), but definately does not “waterproof” any tile installation the way a membrane will.

What is Schluter trim?

Schluter ®-RONDEC is a finishing and edge-protection profile for tiled edges and outside corners of tiled surfaces. The reveal of the profile forms a symmetrically rounded corner along the surface edge.

Can I put Kerdi over plywood?

-Schluter told me Kerdi can not be put over plywood that it prohibits it from breathing and will move.

Can you paint over Kerdi membrane?

Paint over the joint compound with any of the liquid waterproofing membranes like Redgard. You‘ll be fine. You could also use an exterior primer paint or even shellac. Then install the KERDI.

What is AquaDefense?

Mapelastic AquaDefense is a premixed, advanced liquid-rubber, extremely quick-drying waterproofing and crack-isolation membrane for installation under ceramic tile or stone in residential, commercial and industrial environments.

Can you tile over waterproof membrane?

Contrary to popular belief, ceramic tile and grout, by themselves are not waterproof. Water can penetrate through cement-based grout and work its way through the substrate. To prevent water damage, you must install a waterproof membrane just below the tile bonding mortar as close to the tile as possible.

Which Thinset for Kerdi?

Unmodified thin-set mortar is recommended to set ceramic and stone tile, including large format tiles, over the KERDI membrane. Portland cement-based unmodified thin-set mortars are dependent on the presence of moisture for hydration in order to gain strength.

What is Kerdi membrane?

Kerdi is a sheet-applied polyethylene waterproofing membrane and vapor retarder. Kerdi200/5M covers 54 sq. ft. and is ideal for waterproofing tiled tub surrounds and showers. This membrane features an anchoring fleece on both sides to anchor it in thin-set mortar.

Can I use Ditra on shower floor?

Waterproofing these floors can save an owner from replacing the tile assembly and substructure in the event of a leak. DITRA-HEAT installations can be made waterproof with minimal effort. If installing the SchluterDITRA-HEAT inside a shower, we require that the entire installation be covered using the Schluter-KERDI.

Is Kerdi board waterproof?

KERDIBOARD by Schluter is one of the best ways to waterproof a shower. A lot of folks like using cement board but it’s heavy and requires a waterproofing membrane over it. Furthermore, if you’r working in an older home KERDIBOARD fits better than cement board in odd spaces.

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