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Unread 09-17-2021, 07:34 AM   #1
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Kerdi / Wedi ? or?

This has probably been ask a thousand times, but here goes.

I would say over 10 years ago. I remodeled my small bathroom (8x4). At that time, Kerdi only had the fabric membrane so I went with Wedi as it was a much easier installation. I remember having to drive over 2 hours to a Wedi distributor.

A couple of weeks ago, I noticed a water leak coming from the bottom drain. Took a 5 gallon bucket of water and just started pouring it down the drain. It seem like the water was leaking from the outside of the drain. So I replaced the Wedi rubber gasket that sits in the drain but outside the drain pipe.

I'm still getting a water leak and since the bathroom was last remodeled over 10 years ago, my wife is saying to gut the bathroom again and modernize it as we plan to sell the house in about 4 years.

I got over 10 years of usage from Wedi, so do I stick with Wedi or go with Kerdi or something else? From a price point, Kerdi is about half the cost of Wedi.

What are the pros and cons of Wedi vs kerdi?
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Unread 09-17-2021, 07:54 AM   #2
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Welcome, John.

A new shower, whether done with a traditional receptor and moisture barrier or done with a direct bonded waterproofing membrane system of some kind, should last at least 30 to 50 years in my view. Your failure in only 10 years is rather premature.

How to do your next one? Entirely dealer's choice. The least expensive is the older method using a PVC or CPE liner over a pre-slope with a second mortar bed for the shower floor and a moisture barrier behind the mortar (if you're capable) or CBU walls. Known to last 50 years and more when properly done.

The newer direct bonded waterproofing membranes have some advantages over those traditional showers, but they also bring with them some disadvantages. But, if done correctly, they have demonstrated lifespans exceeding 30 years, too. The ones done with the foam boards that have the waterproofing built in are still newer and the ones that are simply glued together to provide the waterproofing, such as you Wedi, have some unique problems of their own. In the case of Wedi there has also always been the problem with availability and cost of the material.

Up to you which materials and methods you choose, but you should be looking for far more than only ten years longevity from your new shower of whatever construction type.

My opinion; worth price charged.

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Unread 09-17-2021, 06:44 PM   #3
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Out of curiosity, what size tile are on the pan and what material did you use to attach them? If the tile are on the smaller size, they call for using an epoxy thinset. Regular thinset, under a heavy point load can deform the foam and crack things, leading to an eventual leak. Not saying that's what happened here. The sheet material on Kerdi helps to spread those point loads better, protecting things.
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