Ceramic Tile Advice Forums - John Bridge Ceramic Tile

Welcome to John Bridge / Tile Your World, the friendliest DIY Forum on the Internet

Advertiser Directory
JohnBridge.com Home
Buy John Bridge's Books

Go Back   Ceramic Tile Advice Forums - John Bridge Ceramic Tile > Tile & Stone Forums > Professionals' Hangout


Thread Tools Search this Thread
Unread 11-23-2007, 06:36 PM   #1
Texas Tile Contractor
Lazarus's Avatar
Join Date: Oct 2006
Location: Beaumont, Texas
Posts: 8,864
Kerdi with a Clamping Drain...?

Check out the last paragraph....

Schl?up>?-KERDI is a waterproof membrane with limited crack-bridging capabilities. It is made of soft polyethylene, which is covered on both sides with a special fleece webbing to anchor the membrane in the tile adhesive. Schl?up>?-KERDI was developed as a waterproofing membrane to be used in conjunction with ceramic tile coverings. Tiles can be installed directly on Schl?up>?-KERDI using the thin-bed method. Other trowel-applied covering materials, such as plaster, can also be used. In addition, pre-cut sections of Schl?up>?-KERDI are available for inside and outside corners, as well as for pipe collars. Use Schl?up>?-KERDI-BAND, in widths of 3-1/8" (8.5 cm ), 5" (12.5 cm), 7-1/4" (18.5 cm), or 10" (25 cm) to seal butt joints or corner joints. Schl?up>?-KERDI-FLEX, in 5" (12.5 cm) or 10" (25 cm) widths, is used to seal expansion joints or flexible edge joints.


Schl?up>?-KERDI is a polyethylene waterproofing membrane with a very high steam-diffusion density. The material is physiologically safe. Schl?up>?-KERDI requires no special disposal.

Material Properties and Areas of Application

Schl?up>?-KERDI is waterproof and resistant to most chemicals commonly encountered in tiled environments. It is resistant to aging and will not rot.

Schl?up>?-KERDI is highly resistant to saline solutions, acid and alkaline solutions, many organic solvents, alcohols, and oils. Information regarding its resistance to specific substances can be provided if concentration, temperature, and duration of exposure are known. Before placing the Schl?up>?-KERDI, verify that the substrate is even, load bearing, and free from moisture. Surfaces that inhibit proper adhesion must be removed or appropriately treated.

Schl?up>?-KERDI is suitable for wall and floor surfaces where protection against the penetration of moisture or other harmful substances is necessary. Surfaces include tub surrounds, gang showers, and areas surrounding swimming pools. Industrial applications include the food industry, breweries, and dairies.

Schl?up>?-KERDI meets the American National Standard for Load Bearing, Bonded, Waterproof Membranes for Thin-Set Ceramic Tile and Dimension Stone Installations (ANSI A118.10 - 1999)


1. The substrate must be clean, even, and load bearing. The adhesive used for bonding Schl?up>?-KERDI must be appropriate for the substrate and must penetrate and engage the KERDI fleece. Generally, a dry-set mortar is used. Cut Schl?up>?-KERDI to size prior to application.

2. Apply the tile adhesive to the substrate using a 1/4" x 3/16" (6 mm x 4 mm) V-notched trowel (Note the open time of the adhesive). Press Schl?up>?-KERDI fully into the adhesive. Work the KERDI into the adhesive by applying pressure to the membrane with the flat side of the trowel (held at an angle) in smooth, diagonal sweeps. Air bubbles must be avoided. An optimal bond is achieved if one side of Schl?up>?-KERDI is first coated with a thin layer of adhesive that engages the fleece webbing.

3. Seams can be constructed by overlapping the edges of the KERDI 2" (5 cm) or by abutting the edges and covering the joint with Schl?up>?-KERDI-BAND, using a dry-set mortar. When anticipating large quantities of water, an impervious adhesive, such as a waterproof mortar, an epoxy mortar, or urethane may be used.

4. For inside and outside corners, adhere the pre-cut KERDI corner sections. For floor/wall connections, use the Schl?up>?-KERDI-BAND. For pipes, use the Schl?up>?-KERDI-KM pipe sleeves.

5. Connections to fixed building elements can be achieved by using Schl?up>?-KERDI, KERDI-BAND, or KERDI-FLEX in conjunction with suitable trowel-applied waterproofing materials, such as those that require atmospheric moisture to cure, or other suitable sealing compounds.

6. Schl?up>?-KERDI shall be separated at existing expansion, structural, or flexible edge joints. Cover the joints with Schl?up>?-KERDI-FLEX. To allow for greater movement, the center section of the Schl?up>?-KERDI-FLEX can be tucked into the cavity of the expansion joint prior to bonding.

7. Once the entire membrane — with seams, corners, and connections — has been completely bonded, and therefore waterproofed, the covering may be applied.

8. For tile installations using the thin-bed method, apply tile adhesive directly to the exposed Schl?up>?-KERDI surface and install the tiles, ensuring full coverage. Use a tile adhesive appropriate for the type of surface covering and intended use. A dry-set mortar is generally used. For acid-resistant coverings, use an epoxy adhesive to set and grout the tile.

Connection to Schl?up>?-KERDI-DRAIN

Schlüter®-KERDI-DRAIN is a floor drain that features an integrated bonding flange specifically designed to allow connections to load-bearing, bonded waterproof membranes. This allows the simple connection of Schlüter®-KERDI to the floor drain. Generally, an unmodified thin-set mortar is used to adhere Schlüter®-KERDI to the bonding flange. When adhering Schlüter®-KERDI, it must be held back to the step in the fleeced bonding flange. With the flat side of the trowel, firmly press Schlüter®-KERDI into the mortar to ensure 100% coverage and a watertight seal. Please refer to method B422 in the Tile Council of North America's (TCA) Handbook for Ceramic Tile Installation. Please contact Schluterr®-Systems for the Schlüter®-KERDI-DRAIN installation video and data sheet.

Notes: 1) Where KERDI-DRAIN is used in shower applications, walls must be waterproofed up to the height of the showerhead. 2) Schlüter®-KERDI-DRAIN complies with: CSA standard B79-94, File #211355 (Floor, Area, Shower Drains, and Cleanouts), NSF: SE AD-130-007, and the International Plumbing Code: section 412.1.

Connection to traditional two-piece drains

For connections to traditional two-piece floor drains, cut a 20" X 20" (50 cm X 50 cm) section of Schl?up>?-KERDI and clamp to the flange of the floor drain or bond to the flange using a suitable trowel-applied waterproofing material such as urethane or similar. The adjacent Schl?up>?-KERDI sheet shall be carried over the cut section with a minimum overlap of 2" and bonded, ensuring full coverage to eliminate any air bubbles.

They didn't want it good, they wanted it Wednesday.
Lazarus is offline   Reply With Quote
Sponsored Links
Unread 11-23-2007, 07:45 PM   #2
Chad Deiter Company
Making Cents of It All
Chad Deiter Company's Avatar
Join Date: Aug 2007
Location: Menifee , California
Posts: 4,603
Send a message via Yahoo to Chad Deiter Company
I still don't see how that would work because that kind of drain is made to go beneath the float. Where as the Kerdi-Drain goes on top of the float.

I'm not sure if anyone has done that.
Chad from CDC54.com " You Dream It and We Create It "
Southern California Custom Tile and Stone Installation
Chad Deiter Company is offline   Reply With Quote
Unread 11-23-2007, 09:13 PM   #3
Old World Tile and Marble
Registered User
Join Date: Sep 2007
Location: albany new york
Posts: 1,341
seems it would be similar to a dimple drain like liquid applied membranes that use a fabric.....somewhere similar to the size of the kerdi drain you make a shallow slope to the bottom of the drain so that the rubber will bend without folds or wrinklesthen finish after with mud on top itll drain into the weeps
Old World Tile and Marble is offline   Reply With Quote
Unread 11-23-2007, 10:17 PM   #4
Registered User
Join Date: Nov 2007
Posts: 48
ive never do a kerdi shower is it really better than a rubber pan and is it used for floated wall showers?

larrylou is offline   Reply With Quote
Unread 11-23-2007, 11:23 PM   #5
Bill Vincent
Tile Contractor
Bill Vincent's Avatar
Join Date: Jan 2003
Location: Bridgton, Maine
Posts: 8,631
I don't know that Schluter would warranty it, but I can see how it could be done. The biggest disadvantage would be that you'd have to make sure the preslope is just as perfect as the final slope, so that you can adhere the Kerdi well, and yes, I would think that it'd have to be adhered, just so that you could be sure of getting a good tight bond on each of the 2" overlaps. I'd think that it'd be a waste of money, though, being that the biggest innovation of using the product is lost, but you know what they say about a fool and his money.

"Whether you think you can, or you think you can't, you're probably right."

Bill Vincent is offline   Reply With Quote
Unread 11-24-2007, 06:44 AM   #6
John Bridge
Join Date: Mar 2001
Location: Rosanky, Texas
Posts: 68,941
Send a message via AIM to John Bridge
They have a "dimple" or divot hat just like Noble Company that can be used with a clamping drain. They don't advertise it, but you can order it.
John Bridge is offline   Reply With Quote
Unread 11-24-2007, 08:09 AM   #7
Healthcare Consultant and Boxer Rescue Volunteer
sgrandjean's Avatar
Join Date: Sep 2004
Location: Bryan, TX
Posts: 964
I do seem to remeber both Steve B and Peter N mentioning that Kerdi could in fact be used with a clamping drain while we were at CTEF in September. Also seem to remember they were going to have additional parts for sale to assist in making the transition. Then again, maybe they said that the connection could be made using a Fernco adapter of sorts.

sgrandjean is offline   Reply With Quote

Stonetooling.com   Tile-Assn.com   National Gypsum Permabase

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -6. The time now is 10:49 AM.


Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2023, Jelsoft Enterprises Ltd.
Copyright 2018 John Bridge & Associates, LLC