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Unread 03-20-2015, 08:12 PM   #1
Tiger Mountain Tile Inc
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Layers and Layers of sheetrock

I'm currently working on a townhome. The main long wall in the photo below is the shared wall between units. There used to be a small non-bearing wall between the tub (right) and the former fiberglass shower unit (left). The wall has been removed.

The problem is that the wall on the right sticks out past the wall on the left. About 3/4" or so. We want the tile from the shower to lap over onto the wall above the tub.

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The problem: If I fill in the lower part of the left wall (section 2) with 5/8" drywall and then use 1/2" cbu (or similar) firred out 1/4 inch the screws would have to be well over 3 inches to screw into anything substantial. Plus, I'm not even sure that is acceptable.

I'm wondering if I can remove the top part of the drywall (section 1) and install 3/4 inch plywood and then screw tile backer into that?

Anybody else have any ideas? Let me know if any of this is unclear.

Thanks
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Unread 03-20-2015, 08:24 PM   #2
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What are the code requirements for the wall in the shower area, Jim?

Seems the most reasonable approach would be to remove all the wallboard to the left of the missing party wall, fur out the framing, and install the desired wallboard for the shower.

What am I missing?
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Unread 03-20-2015, 08:38 PM   #3
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My guess is that the shared wall needs 2 layers of 5/8" to meet code. That's the way the right side is. I want to mess with the integrity of the shared wall as little as possible.
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Unread 03-20-2015, 08:40 PM   #4
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We've run into multiple layers of 5/8" many times. Not sure if they were thinking of the fire code or sound deadening... We just put it all back as not to risk the liability
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Unread 03-20-2015, 09:09 PM   #5
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How 'bout leavin' alla drywall, and adding more where necessary, then gluing up some foam board for the shower so's not to need any CBU at all, Jim?
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Unread 03-20-2015, 09:11 PM   #6
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I'm probably not explaining this very well.
  • The right side has two layers of 5/8".
  • To make the left side match the right side I would need 4 layers of 5/8"
  • Obviously the outer-most layer would be some sort of tile backer.
  • If I want to screw through 4 layers of 5/8 I would need 3 inch screws to get into the osb layer. 4 inch if I want to actually get into a stud.
  • Do they make 4 inch cement board screws?
  • Do they make 4 inch stainless foam board screws?
  • Is it a good idea to install cement board over 3 layers of 5/8" drywall?
  • Is it a good idea to make layer number 3 a sheet of plywood instead?
Left side
1/2" osb
5/8" drywall
5/8" drywall
5/8" drywall (plywood instead?)
5/8" tile backer
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Unread 03-20-2015, 09:28 PM   #7
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But if you were to use nothing but drywall and foam board, Jim, you'd not need any mechanical fasteners at all and wouldn't need to try to sandwich in any plywood.

Drywall's cheap. Glue up as many layers of whatever thickness you need and top off with glued foam board.

Or pay large dinero and get some of the really thick foam board, but I can't see that being of any real value here. Nor do I see any advantage to use of CBU.
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Unread 03-21-2015, 07:11 AM   #8
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Gluing up foam board would be the preferred solution. I just wasn't sure that was acceptable- installing it without screws/washers.
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Unread 03-21-2015, 08:15 AM   #9
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Jim,

As long as you have a continuous double layer of 5/8 drywall , you should be fine . I would remove to studs the deeper wall -- left side -- , fur it with plywood strips or similar , then add the 2 layers of drywall in a continuous line . If necessary , I would recommend cutting into the right side wall as such to create an overlap on the second layer of drywall vs. the first layer one .
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Unread 03-21-2015, 09:12 AM   #10
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Quote:
Originally Posted by Jim
The main long wall in the photo below is the shared wall between units.
Because of this, i'd leave whatever is there and add to it to get what you want. It is likely an occupancy separation wall (fire rated and and/or sound wall) of some sort whether it's built properly or not. Regardless, if you alter it, you own it.

Adding drywall or cement backer board to it, does not alter the original separation wall.
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