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Old 12-17-2009, 08:51 AM   #46
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Bathroom Remodel Questions


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Originally Posted by Vikeologist View Post
My local lumber yard did not have any moisture resistant or greenboard drywall, so I had to get regular drywall...

I am very worried this will cause problems later with mold and mildew. Will I be ok using regular drywall in my bathroom, or did I make a major mistake...

we already have the ceilings up with regular drywall
My bathroom has regular drywall. I wish it had moisture resistant, but it is what it is. There doesn't seem to be any problem in my specific case, although I'm pretty big on running the fan when showering. I get occasional mold growing on the ceiling but I clean it off right away.

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Old 12-17-2009, 09:59 AM   #47
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Bathroom Remodel Questions


so should I tear down the regular drywall and re-do it with moisture resistant drywall?

what about the walls, should I use moisture resistant on the walls, or just continue with the regular drywall? Thanks!
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Old 12-17-2009, 12:15 PM   #48
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Drywall is fairly cheap and now is the time to do it. Sure you might get away with a well sealed regular dryway, but why risk it?
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Old 12-17-2009, 01:33 PM   #49
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wow, so I should tear it down and start over huh?
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Old 12-30-2009, 03:44 PM   #50
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Bathroom Remodel Questions


OK I am at the point of getting the subfloor ready before I have the tub installed.

I have what looks to be 2 layers of wood nailed as a subfloor in my bathroom. The floor was squeaky, so I screwed the subfloor to the floor joists.

What do I do next. Do I install plywood over the top, and if so, how thick, and what kind? Do I put thinset in between the subfloor and the plywood? Do I screw the plywood into the joists or just to the subfloor only? Do I run the plywood all the way under where the new tub will be?

After the plywood then do I install a cement board over the plywood, if so, how thick? Do I install the cement board under the tub as well, or should I wait with the cement board until the tub is installed and just install it up to the side of the tub?

Thanks!
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Old 12-30-2009, 09:44 PM   #51
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if you have two layers of wood over the joists you may be fine. you need 1 1/8" of sub flooring. But what are these layers? Plywood (exterior grade for top level) should be used. If not you may want to remove one of the two layers and use one sheet of plywood. Even under the tub with this. Then use either 1/4" CBU or Ditra on the plywood prior to tiling. this does not go under the tub. So put the tub in after plywood is installed. Pl400 is used with screws or nails to lay the plywood. Thinset with approved screws is used for the cement backer. Modified thinset to set the Ditra with unmodified thinset to lay the tiles.
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Old 12-31-2009, 07:26 AM   #52
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no there is no plywood. It looks to be some 3 inch wide boards...not sure if they are tongue and groove or not.

I already screwed this all down to the joists, can I add a layer of plywood over the 2 layers of wood flooring, then add the cement board over that, then the tile over that? how much space am I going to need for this?

how thick of plywood, then a 1/4 inch of cement board, then the tile
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Old 12-31-2009, 09:13 AM   #53
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yes you can add 1 1/2" exterior grade plywood glued and screwed. Then 1/4" cement board set in thinset and screwed.

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