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Old 05-31-2006, 09:02 PM   #1
Mike_Snyder
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Mike's Bathroom Project

I am about ready to tackle our master bath remodel. Installing a steam shower, claw foot tub, new floor vanities, toilet...everything. Things are going to get messy. Although I have done several tile jobs such as backsplashes and floors, I've never tackled a shower, let alone a steam shower! I purchased the TYW book and the Kerdi Shower Book. My steam shower is 4x6 and I plan to use Kerdi. Many of my questions have been answered after reading the books and lurking on this forum for several weeks, but I know I'll have some more questions. My first question is about the ceiling in my steam shower.

I want to simply frame out the tray opening with 2x4's layed flat against the ceiling and slope the opening, along the 4' length, from the 2x4's nominal 1.5" thickness and cover with drywall, taking into account for 1/2" drywall thickness, this will give me a 1" slope along the 4' length of the ceiling. My question is 1.) is this slope adequate for water runoff (1/4" per foot) along the ceiling and 2.) can I install the Kerdi on the ceiling in the same manner, using unmodified thinset? I want to tile the ceiling and am concerned about the weight of the tiles and the stregth of the Kerdi/thinset on the ceiling.

(Jeff did reply to my question in the KSB thread regarding the slope. I wanted to start my project thread though. Anyone else have an opinion?)

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Mike
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Old 05-31-2006, 10:23 PM   #2
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Hi Mike, the slope on the ceiling is suppose to be 2" per foot. Some people just leave it flat others will slope it. The Kerdi will stick just fine to the drywall on the ceiling with unmodified thinset.
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Old 06-03-2006, 08:51 PM   #3
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Ok to reuse mud floor???

OK, been doing demo for the past 2 days. Couldn't figure out what the tile was laid on. I think it is a 1" mortar bed, layed directly on 1/2" plywood subfloor w/ joists on 12" centers. My question is: Is it OK to reuse this bed? The cheap 4x4 tiles appear to chip right off the thinset. I wanted to re-route the plumbing in the walls, so I started chopping it up. Pretty solid floor. The tiles area covers about 2/3s of my bath floor. If I reuse the mud floor, I will have to float a new mud floor in the void where I took up the tub surround since that was built on top of the plywood subfloor. I guess the other option is to rip the old 1" mud floor up including the metal lath and lay new CBU down on the entire area, since the total bath floor area will be about 15'x16' so if I can reuse this existing mud floor I thnk it will save me a lot of expense and time. Any comments? Good idea or no?

Having trouble uploading pics...keeps giving me a URL error!)
For some reason this forum software won't allow me to post URLs where I have the pics hosted...any ideas? I resized tehm, but since they have to be below 50K, the quality is poor.


Thanks,
Mike
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Last edited by Mike_Snyder; 06-04-2006 at 06:29 AM. Reason: updating info
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Old 06-04-2006, 05:56 PM   #4
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bump

Should I be starting a new thread for each question I have or ask in all my questions in this thread? Thx.
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Old 06-04-2006, 10:26 PM   #5
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keep all questions for same project in a single thread and be sure to check out the "new here..." link in Mike's signature.

as for re-using the bed, I imagine folks here will discourage that approach as there's no way to know what you really have.
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Old 06-04-2006, 10:31 PM   #6
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I agree with sandbagger, until you pull up the mud bed, you won't know whats going on. If I didn't pull up my mortar bed, I wouldn't see the rot in the subfloor!! I was leaning up against it with my hand after I took up the bed and found my hand go right through the subfloor!!!!!!!

Take it up, see whats under there.
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Old 06-04-2006, 11:39 PM   #7
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If I understood your first post correctly, you're planning to slope the ceiling towards the door. That will result in the condensation running down the door glass, which I don't think is very desirable. You're better off sloping the ceiling towards a wall, and preferably one that is not used as the backrest for a bench.
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Old 06-05-2006, 11:27 AM   #8
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If I decide to slope the ceiling, I will slope it toward the back wall, not the door. I am thinking about not sloping at all, we are onlt going to be taking steam showers for 15-20 min max at a time, I wouldn't thinkt eh water droplets would start dropping that quickly?!?!?! I guess it depends.

As far a taking up the mortar bed. I really didn't want to hear that! Just added considerable time to this project, however, I do want to do it correctly and do not want to cut corners. Why would there be any rot in the main part of the floor if it isn't near the tub or other water source. I will be taking up the old shower pan so I can check for rot there. I also am going to be taking up the bed in places like the pic above to relocate the plumbing inside the wall and to move a wall. Would it be enough to check for rot in those places?
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Old 06-05-2006, 01:23 PM   #9
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mike,

That was my personal experience. Your experience may differ. Sorry for any confusion!

Andy
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Old 06-05-2006, 05:47 PM   #10
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No confusion Andy. I want to be sure I am doing the job right. I've done many tile floors in the past, but never owned the houses long enough to see how they held up. In the past I never used CBU, but always layed 1/2" Plywood down to add to the strength of the floor, then used modified thinset and tiled right to the plywood.

I think we are going to be in this house for awhile. There is some deflection in the ~1/2" subfloor where I took the tub out, but where the 1" mortar bed is and the 4.25"x4.25" tiles over it, it appears to be very solid and stable. I do hear a noise at one point, sounds odd, kinda like a creak, but not a nail-head-type creak. I guess if I rip up the mud floor I should also add 1/2" of plywood before I lay down the CBU to be safe...cha ching..this is gonna be an expensive remodel. I have $20K just in fixtures and tile so far!
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Old 06-05-2006, 08:21 PM   #11
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Hi Mike, just think of the value you will add to the house after all that hard work.
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Old 06-06-2006, 07:30 PM   #12
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Mud Floor Question

Ok, suppose I take the lazy route and decide to take my chances and reuse the mortar bed my tile is on. How would I join the new portion of the mud floor that I need to lay down to the old existing floor? (Since there is a large ares where the tub and surround was sitting) Would you put thinset between the joint? Would this joint be a potential area for cracking down the road? Just trying to weight all my options.
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Old 06-08-2006, 08:11 PM   #13
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bump - anyone have any ideas? thanks!
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Old 06-08-2006, 08:15 PM   #14
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Hi Mike, you could use thinset to bond the old mud to the new. I would use a membrane such as Ditra over the whole floor then.
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Old 06-08-2006, 08:45 PM   #15
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Thanks for the reply Mike. I guess the theory of using a membrane over the entire floor is to ensure no cracks develop? I am using 18"x18" Cremamarfil (I think I goofed up the name.) Anyway, I guess the tile size probably doesn't matter. But I thought I'd ask.

I think I just need to tear up the mortar bed and lay some cement board down. I know that seems to be the best approach form suggestions here.
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