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Unread 12-20-2008, 10:22 PM   #1
Snets
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Kerdi Layering seems backward

I did a search but have not found the answer to this......

it seems, in all I have read and seen here and on the Kerdi website that the layering - top to bottom - of the waterproof barrier is backward to all I know about waterproofing....which is not much I admit. I know when flashing windows, it's bottom to top so that all water that runs down, by gravity, cannot get under the next layer because the upper layer is overlapping the lower layer.

That's pretty much the only question I have before I buy a Kerdi system for the shower I am going to build. Otherwise, I'm sold.

Can someone address this, does it make sense?
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Unread 12-20-2008, 10:29 PM   #2
HS345
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Hello,
Kerdi does not rely on the water shed principle. The two inch overlaps are what create the waterproofing of the membrane, you can lap it any which way you choose.

I run my Kerdi sheets vertically.
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Unread 12-20-2008, 10:30 PM   #3
Rob Z
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Hi,

You can run Kerdi anyway that you need to do to make the installation go easier.
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Unread 12-20-2008, 10:42 PM   #4
cx
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Welcome, Snets. Please put a first name in a permanent signature line for us to use.
Quote:
Originally Posted by Schluter Website
KERDI, KERDI-BAND, KERDI-KERECK-F, KERDI-SEAL-PS, and KERDI-SEAL-MV are installed using unmodified thin-set mortar (mixed to a fairly fluid consistency, but still able
to hold a notch). Dampen particularly dry and porous substrates in order to help prevent premature drying or skinning of the thin-set mortar. Apply the thin-set mortar using a
1/4" x 3/16" (6 mm x 5 mm) V-notched trowel or the Schluter
®-KERDI trowel, which features a 1/8" x 1/8" (3 mm x 3 mm) square-notched design. Embed the membrane into
the mortar throughout its entire surface to ensure proper adhesion and to remove air pockets. Periodically lift up a corner to check the fleece for full coverage. The sequence
of membrane installation can vary provided that a minimum 2" (50 mm) overlap is maintained at all joints and proper connection to the KERDI-DRAIN is established. Note:
Top-over-bottom or shingle laps of the membrane are not required.
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Unread 12-20-2008, 10:53 PM   #5
Snets
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Well thank you for the QUICK! replies. I'm working on the signature thing. I appreciate the quote from the Kerdi web, I musta missed the unnecessary "Shingle laps" layering part. Thanks.

It still seems wrong but all I have read, this system works.
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My FIRST Kerdi Shower Project

Always look in the LIBERRY
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Unread 12-20-2008, 11:20 PM   #6
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Lotta cardboard boxes been Kerdied and used as beer coolers just for fun, Snets. It works.
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Last edited by cx; 12-21-2008 at 10:39 PM. Reason: typo
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Unread 12-21-2008, 05:45 PM   #7
Snets
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Thanks

It's funny that in many online forums, I've subscribed to a few, there is always someone who is quick to post something negative about whatever it is you are asking about....You have built my confidence with all of the reading on this site about Kerdi.

I'm a weekend warrior who will take on almost any project (with the exception of large drywall finishing and any non-flat brick work). I'm ready to dive into my shower, figuratively, with all of the great info here. Thanks again.

Now, best ways to rough-in my new Moen valves.....I'll start searching....
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Unread 12-21-2008, 09:08 PM   #8
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Hi Snets,

Kerdi is great stuff. Get your 2" overlaps and you'll be fine. I don't like doing plumbing but when I did my shower a few years back I managed to get my Moen control valve, shower head and 4 body spray heads installed without too much curing.
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Unread 12-21-2008, 10:42 PM   #9
cx
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Quote:
Originally Posted by Snets
It's funny that in many online forums, I've subscribed to a few, there is always someone who is quick to post something negative about whatever it is you are asking about
Oh, you just axe about tiling over greenrock inna shower or tiling a floor over some vinyl tile on Luan plywood and we can find you some folks'll be pretty negative for ya.

You just happened to pick a good product with which we're pretty familiar.
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Unread 12-22-2008, 04:10 PM   #10
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Quote:
It's funny that in many online forums, I've subscribed to a few, there is always someone who is quick to post something negative about whatever it is you are asking about....You have built my confidence with all of the reading on this site about Kerdi.

I'm a weekend warrior who will take on almost any project (with the exception of large drywall finishing and any non-flat brick work). I'm ready to dive into my shower, figuratively, with all of the great info here. Thanks again.

Now, best ways to rough-in my new Moen valves.....I'll start searching....
Oh you just caught us on a good day! Seriously, this is one of the best boards I've been on. Lot's of people who know their stuff! I used to think I was pretty smart until I started talking with people on here!
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Unread 12-23-2008, 09:23 PM   #11
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Do you have a specific question about your Moen valve rough-in? I bet we may have the answer!
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Unread 12-24-2008, 12:13 AM   #12
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I started a thread about this same question months ago. I am confident in kerdi either way you lap it, but I try to do it like flashing whenever possible. If I can give you some advice from my mistakes, I did my first kerdi shower some time ago, and it was a nightmare. Mainly because I used "Custom" un-modified thin-set, and I didn't make it loose enough. I know versabond voids the warrantee, but John Bridge uses it, and it sticks much better. Make the thin-set pretty wet. I had air bubbles that I had to cut out, and edges that wern't bonded well. Also take your time. I was in a hurry the first time. It's not that difficult, but don't hurry. Hope that helps.
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Unread 12-24-2008, 12:15 AM   #13
Snets
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Snets' Remodel & Kerdi Shower

Hi everyone......I'm a fairly skilled WW and am tackling my second bath remodel......first one with a shower. It will also be my second tile job, my first was floor tile in an entry, hall, bath and laundry room.

I'm not an expert, professional or such but I do pretty good work. I don't like paying money for someone else to do things I can do....That is said with all due respect for the pros, you guys work hard and have some serious skills and talents.....Let's face it, you are the ones actually making money doing this stuff.....I am nowhere near that nor do I want to be.

But, I certainly appreciate the advice I have received and read here so that's why I wanted to start this post of my remodel/shower so I can get some feedback, advice, wisdom, direction, criticism, scolding, laughter, heckling, etc. to insure that I am doing this project correctly....meaning it won't leak, fall apart, blow up or otherwise self-destruct.

My eye for design may not be the same as yours....that's OK, I'd be glad to hear what you have to say. If you want to say it's stupid or looks like crud, that's fine, but please say why you think that, and provide a better solution. I appreciate ideas.

Project: Kerdi shower w/ mud base, porcelin tile, vertical spa system.

OK, enough.....here's the beginning (Should be pictures here)
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My FIRST Kerdi Shower Project

Always look in the LIBERRY
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Unread 12-24-2008, 12:38 AM   #14
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I'm working on posting a few photos but I' having a heck of a time getting them small enough......more to come as far as photos.

For now, I am planning to do my own mud deck. There will be a bench or benches. My ceiling will drop down 8 inches or so with a proper sealed light. there is a fan already in the room, not above the shower.

The window is on order.....vinyl w/ privacy galss so no blinds needed.

I began here on this site w/ a question about how to lap Kerdi. thanks for all the responses. I have since bought TYW and the Kerdi Shower Book. Now I'm ready to go. So Once I figure out how to get my photos small enuf to post, this will be a timeline of my project.

Look forward to talking to you all about it.
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Unread 12-24-2008, 12:41 AM   #15
Tool Guy - Kg
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Hi Snets,

This might help. It's an article written on resizing photos to fit the forum size limits.
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