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Unread 01-28-2007, 09:54 AM   #1
Al Bundified
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Question Oops! Bonehead flooring mistake.

Here's the deal.

Existing 10' x 4' utility washer / dryer closet had been converted into a small bathroom with a fiberglass shower stall, commode & sink vanity, sometime in the 70's with that fugly fake plastic marble stuff glued over the sheetrock.

Both the floor & ceiling were failing, so I ripped everything out.

Ceiling was failing because ventilation fan exhausted straight into attic.

Discovered floor was just layers of particle board with the odd vinyl layer sandwiched. Floor joists had been hacked with a reciprocating saw to get drain for commode to fit & where plumbing for washer used to be before the 1970 bathroom conversion, those floor joists & bottom of wall studs had suffered rot / dry rot.

Replaced all floor joists & rotted wall studs. Beefed up the floor by going with 10" floor joist spacing with blocking in between, as opposed to standard 16" spacing.

To get the floor level with adjoining room I had to build the floor up with 3 layers of 3/4" plywood (used White Lightening caulk between all plywood joints) then durock.

Needless to say, the floor is now rock solid and when I say rock solid, I do mean rock solid!

Here's my bonehead move.

Forgot to use versabond between the durock & last layer of plywood.

Shower pan is a preformed piece. So the area of tile (13' x 13" glazed porcelain) that will actually go on the durock which has not been versabonded to the plywood, is only a 4' x 6 ' area.

Am I ok to lay the tile?
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Unread 01-28-2007, 10:02 AM   #2
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Hi Steve, I would take it up and thinset it to the ply. You are asking for trouble in the future with tiles and grout cracking.
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Unread 01-28-2007, 10:09 AM   #3
HS345
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Hello Steve, I don't recommend it, but if you screw the durock down real good with cement board screws, and tape the joints you'll probably be okay.

A lot of guys in my area NEVER use thinset under their cbu. That's okay, more work for me.

Having said that, your best bet would be to take it up and install the cbu correctly.

Hope that helps.
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Unread 01-28-2007, 10:27 AM   #4
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If it makes any difference, I forgot to mention the durock is screwed down really, really really good & I'll be using the Spectra Pro epoxy grout.

One issue I have with taking the durock up, is some (ok, a lot) of the screws got stipped as I was trying to set them. Did not initially countersink them.

But if you guys think it's destined to fail, I'll rip 'er up & re-set the durock with versabond.
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Unread 01-28-2007, 10:35 AM   #5
Davy
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Hi Steve, I'd take it up and do it right, even if I had to replace the CBU with a new piece with new screws. It's not that big an area. The epoxy grout might buy a little extra time but not much. If the tiles move, the grout will come out.
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