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Old 02-15-2009, 08:38 PM   #31
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Purpose of gaps between sheets of plywood?


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Originally Posted by R&D Tile View Post
diy888, you want to use Wedi to waterproof a floor?, not a great idea, all those holes from the fasteners have to be sealed.

You want a waterproof room, USE Ditra, best system out there if used correctly.

With proper maintenance & prep work ANY tile or stone can be used in a shower, just because MB says not to doesn't mean it can't be done.

If I can't mud the floor, it's Ditra or I walk, will never set a CBU on a floor again.
I've been unable to find a clear list of all the prep that needs to be done if using a glazed non-vitreous highly absorbent tile in a shower.

So far, I've used WEDI on the walls and the shower base, though I did also purchase thinner (1/4") panels to use on the floor. It was a really simple thing to seal the screws/washers and the board joints with polyurethane sealant and a putty knife. I bought a battery-powered sealant applicator gun for the job. In addition to hurting my neck and needing to minimize lifting, I had wrist surgery too; squeezing a caulking gun would cause nerve pain. Lots of tools now! Back when I started the project, all I had was a handsaw, a hammer, and a corded drill.

Ditra sounds like a very good product from what I've been reading and hearing and I would certainly use it on my next project. But when I started looking into uncoupling membranes, I was under the mistaken impression that latex modified thinset could not be used under Ditra to bond it to a plywood substrate; so I went with the WEDI, which uses modified thinset.

Another thing is that the WEDI boards seemed a lot easier to apply to the walls than Schluter's Kerdi membrane; you don't need a helper with the WEDI boards, but to hang the Kerdi on the walls, a helper would be good to have, to keep the membrane straight so it doesn't kink up or get crooked. If a WEDI board is installed off-level or out of plumb, you just re-do it. If the Kerdi membrane is applied crookedly, you have a mess, because of the adhesive.


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Old 02-16-2009, 06:19 AM   #32
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Purpose of gaps between sheets of plywood?


A well-done, waterproof shower is a system, not a collection of individual components chosen for convenience, sorry. You'll find this out now or later...
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Old 02-16-2009, 07:00 AM   #33
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Purpose of gaps between sheets of plywood?


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A well-done, waterproof shower is a system, not a collection of individual components chosen for convenience, sorry. You'll find this out now or later...
I'm not sure what you're insinuating here. The WEDI panels are sold as a waterproofing system: the inner layer between the fiberglass-reinforced cementitious skins consists of impermeable extruded polystyrene; the joints between the wall panels and between wall-panels and the WEDI prefab shower base are sealed with a polyurethane bead such as SikaFlex 201 US or Bostik 1100 FastSet. In my case the panels are being fastened to bare studs (they can be fastened to other substrates as well) and I am using 1-5/8" stainless steel screws (overkill) with the special WEDI dimpled washers spaced about every foot, exceeding their recommended minimum fastening schedule. The screws and washers are also sealed with a dab of polyurethane that is spread with a putty knife. Are you hinting that there are fatal flaws in the design?

Most of the tile supply stores and showrooms I've visited are unfamiliar with WEDI, though some of them do stock Schluter Ditra and the Schluter protective metal edging products. The WEDI boards are relatively expensive products, and this may be the single greatest factor slowing the company's market penetration. I've found them to be quick and easy to work with and have no trouble believing WEDI's claims that their system offer builders and contractors significant savings of time (and associated labor cost).
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Old 02-16-2009, 07:59 AM   #34
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Purpose of gaps between sheets of plywood?


I'm getting lost here, your over thinking the glazed tile prep work, just install it.

As for the floors, Wedi or any other backerboard needs to set in thinset, doesn't matter what type, the thinset is there to fill any voids, not adhere it.

You can't compare Wedi or any CBU to Ditra, Ditra is an uncoupling membrane, Wedi and CBUs are NOT.

Now, you said shower, are you biulding a shower pan?

If so, exactly how are you doing this?

And yes, Wedi is a great product, but wouldn't waste my money on it for floors.
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Old 02-16-2009, 09:09 AM   #35
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Purpose of gaps between sheets of plywood?


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As for the floors, Wedi or any other backerboard needs to set in thinset, doesn't matter what type, the thinset is there to fill any voids, not adhere it.
Thanks for that. I want to know the reason for things, and don't like just following recipes.

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Now, you said shower, are you biulding a shower pan?
I installed the WEDI prefabricated Fundo shower base with integrated drain. The base has a rabbeted perimeter edge that the WEDI wall panels fit into, sealed with polyurethane.

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And yes, Wedi is a great product, but wouldn't waste my money on it for floors.
I supposed the foam in the WEDI panels would provide uncoupling, since they say it prevents crack propagation; but I haven't installed them yet on the floor, so I can switch to DITRA without taking much of a cost hit. It's a small floor, roughly 50 sq ft not including the shower.
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Old 02-16-2009, 11:01 AM   #36
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Purpose of gaps between sheets of plywood?


OK, never used Wedi shower system, so can't comment on that.

But nothing beats Ditra on a correctly prepped floor except a full mud job, still #1.

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