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Old 10-25-2010, 10:12 AM   #1
MaryK
 
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Tiling an outside wall over lathe and plaster and window


Hello all - I am new to this forum. Have renovated a total of 10 houses, but just basic stuff. Now I am working on my own house and really need help - had problems with contractor showing up etc so decided to finish the project myself.

Adding a 2nd story bathroom in 100 year old farmhouse. The bathtub will sit in a alcove on an outside wall. The ceiling above the tub is slanted, so the wall height at that side of the house is about 5'6". There is a window on this wall that sits at floor level since it is a short wall The walls are lathe & plaster and the plaster has already been removed. I will tile around the tub.

I don't want to remove the window because I do not want to change the balance on the outside of the house. We left the storms on outside, took out the inside windows and hung a blind there, then we framed it inside, put in white foamboard for insulation then osb board over that, so the window is covered from the inside. The window frame sticks out from the lathe so we need furring strips to level the wall with the frame. After furring, do I install the cement board directly to the furring at the studs, or should I install some osb or plywood first? The wall has blown in insulation. We are in Iowa and have cold winters here. I also wanted to put a skylight over the tub since the room will have no outside window for light.

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Old 10-25-2010, 01:00 PM   #2
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Tiling an outside wall over lathe and plaster and window


Why is the window frame sticking out? Can you trim it? Would be easier than adding furring strips to an entire wall.

Yes you can attach Durock / cementboard directly to the studs. Apply a bead of PL Premium to the studs as well for added strength.

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Old 10-25-2010, 10:58 PM   #3
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Tiling an outside wall over lathe and plaster and window


Thanks for the reply. The window frame is sticking out because it was even/flush with the plaster. When we removed the plaster, it extended further out than the lathe. I thought that the furring strips would also add an air space that would serve as a vapor barrier behind the cement board. I thought I needed this because it is an outside wall. I feel like I am just shooting in the dark looking for specific information that fits this odd situation. I don't like to proceed without a solid plan and later have the work fail because I overlooked some small detail.
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Old 10-26-2010, 08:13 AM   #4
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Tiling an outside wall over lathe and plaster and window


Quote:
Originally Posted by mkjeld View Post
Thanks for the reply. The window frame is sticking out because it was even/flush with the plaster. When we removed the plaster, it extended further out than the lathe. I thought that the furring strips would also add an air space that would serve as a vapor barrier behind the cement board. I thought I needed this because it is an outside wall. I feel like I am just shooting in the dark looking for specific information that fits this odd situation. I don't like to proceed without a solid plan and later have the work fail because I overlooked some small detail.
Where did you get, "an air space that would serve as a vapor barrier"? If you want a vapor barrier, add a 6 mil plastic one. Adding the strips will give you some added insulation space, if you use it. Leaving it unfilled has little use.
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Old 10-26-2010, 09:36 AM   #5
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Tiling an outside wall over lathe and plaster and window


Thanks for the reply. I read somewhere that the air space allowed any moisture from condensation etc. to dry instead of staying wet and causing mold. I thought that was what a vapor barrier was.
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Old 10-26-2010, 09:44 AM   #6
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Tiling an outside wall over lathe and plaster and window


Quote:
Originally Posted by mkjeld View Post
Thanks for the reply. I read somewhere that the air space allowed any moisture from condensation etc. to dry instead of staying wet and causing mold. I thought that was what a vapor barrier was.
No, if you want a vapor barrier, add the plastic. If you want more insulation space, add the furring strips, and add insulation. I am not sure you really need a vapor barrier on the second floor, but it won't hurt anything especially since its the bathroom. Do you have an exhaust fan in the Bathroom? If you don't now would be a good time to put one in through that wall of yours. You really need something to vent out the moisture.
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Old 10-26-2010, 11:58 AM   #7
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Tiling an outside wall over lathe and plaster and window


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I am not sure you really need a vapor barrier on the second floor, but it won't hurt anything especially since its the bathroom.
I don't understand this advice at all.
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Old 10-27-2010, 09:23 PM   #8
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Tiling an outside wall over lathe and plaster and window


Thanks for the replies. We have roughed in the electric and we will have a bathroom fan, won't be through the wall but the flat part of the ceiling. I plan to get a large, expensive one, the ones we have had in the past in other bathrooms were always inadequate despite that they were the size called for by the sq ft of the rooms. I called the cement board helpline today and they said furring strips were fine, or anything else that made the surface level with the window frame. We plant to add the poly vapor barrier.
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Old 10-28-2010, 07:48 AM   #9
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Tiling an outside wall over lathe and plaster and window


The weak link I see here is the window. Make absolutely certain you have
weatherized it sufficiently, sprayfoam etc. Is the window original to the house, check the putty holding the panes in. Check under the trim, has it been sprayfoamed to prevent air penetration and moisture getting in. You wouldnt want your walls rotting from the outside in. This would be a very costly and frustrating fix-after the fact.

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