Does KERDI need to dry before tiling?

Yes. Let the membrane cure and dry after it is set on the substrate so the bond is secure and the surface is stable for tile adhesive.

Can I use modified thin-set with KERDI?

Schluter does not recommend it. Polymers and other additives in modified thin-set can interfere with the bond; use unmodified thin-set over the membrane.

Is KERDI suitable for a steam shower?

Yes. Its low vapor permanence lets it serve as a vapor retarder in continuous-use steam rooms as well as residential and intermittent showers.

How much coverage do the rolls give?

Rolls run from 54 sq ft (1 x 5 m) up to 646 sq ft (2 x 30 m). Measure walls and floor and add for laps and corners before choosing a size.

What else do I need for a complete shower?

KERDI-BAND for seams, preformed corners and pipe seals, and a KERDI drain or shower tray if you are building the pan. The membrane alone does not seal penetrations.

Can KERDI go over drywall or cement board?

It bonds to common substrates including cement board and drywall in Schluter's approved assemblies. Check the substrate and assembly against Schluter's installation handbook for your build.

Where is the Schluter Kerdi Waterproofing Membrane cheapest?

At Amazon, for $100.00, as of our latest check.

What do buyers say about the Schluter Kerdi Waterproofing Membrane?

Rated 4.9 out of 5 from 14 ratings. Buyers like: Great product for waterproofing showers; Membrane adheres well and is thin enough not to interfere with wall flatness when lapped; Excellent product, used on all showers.

Where can I buy the Schluter Kerdi Waterproofing Membrane?

3 stores we checked sell it, including Contractors Direct, Amazon, Pro Supply Center.

Schluter Kerdi Waterproofing Membrane Price History: Lowest $100.00

What reviewers say

4.9 / 514 ratings

Buyers rate it very highly and call it the standard for shower waterproofing. They say it adheres well and stays thin enough at laps that wall flatness is not affected.

What people mention

AdhesionPraisedBuyers say the fleece bonds firmly to thin-set on walls and floors.
ThicknessPraisedOwners note it is thin enough that lapped seams do not throw off wall flatness.
ReliabilityPraisedReviewers call it a dependable choice and use it on every shower they build.

From Contractors Direct

Pliable sheet waterproofing membrane, an industry standard for ease of use and reliability
Anchored with fleece on both sides for efficient waterproofing on walls and floors
8-mil thick with water vapor permanence of 0.90 perms (ASTM E96, Procedure E, 90% relative humidity)
Bonded waterproofing membrane and vapor retarder with very low water vapor permanence
Can be used in residential, intermittent and steam showers
Serves as a vapor retarder

Sizes: 3' 3" x 16' 5" (54 sq. f, 3' 3" x 33' (108 sq. ft., 3' 3" x 23' (75 sq. ft.), 3' 3" x 98' 5" (323 sq. , 6' 7" x 98' 5" (646 sq. , 3' 3" x 66' (215 sq. ft.
Shipping: Flat rate shipping for orders under a set amount; other options at checkout. Same-day shipping cut-off for ground orders on CD stock items is 3:00 PM ET, and 12

About the Schluter Kerdi Waterproofing Membrane

Schluter KERDI is a pliable sheet waterproofing membrane for walls and floors. It has fleece anchored on both sides and is 8 mil thick. It is a bonded waterproofing membrane and also serves as a vapor retarder.

Its water vapor permanence is 0.90 perms, tested to ASTM E96, Procedure E, at 90% relative humidity. It can be used in residential, intermittent, and steam showers, and in continuous-use steam rooms and similar applications.

After the membrane is installed on the wall or floor substrate, it needs to cure and dry before tile is installed. This lets it adhere securely and gives the tile adhesive a stable surface. Modified thin-set is not recommended with KERDI, because additives such as polymers can interfere with installation and performance.

Type: Bonded waterproofing membrane and vapor retarder
Thickness: 8 mil
Vapor permanence: 0.90 perms (ASTM E96, Procedure E, 90% relative humidity)
Construction: Fleece anchored on both sides
Surfaces: Walls and floors
Uses: Residential, intermittent, and steam showers; continuous-use steam rooms
Roll sizes: 3' 3" x 16' 5" (54 sq ft); 3' 3" x 23' (75 sq ft); 3' 3" x 33' (108 sq ft); 3' 3" x 66' (215 sq ft); 3' 3" x 98' 5" (323 sq ft); 6' 7" x 98' 5" (646 sq ft)
Metric sizes: 1 m x 5 m (5 m2); 1 m x 7 m (7 m2); 1 m x 10 m (10 m2); 1 m x 30 m (30 m2); 2 m x 30 m (60 m2)
Thin-set: Modified thin-set not recommended

What buyers say

Buyers like

Great product for waterproofing showers
Membrane adheres well and is thin enough not to interfere with wall flatness when lapped
Excellent product, used on all showers
Fast shipping and best price around
Good product with fast delivery
Great customer service and communication about stock