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Unread 10-28-2005, 07:38 AM   #1
nonstopaz
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Masterbath shower and tub -the fun begins

I'm starting my masterbath project.
There is a 1/4" underlayment over 3/4" plywood on the floor. The old ceramic tile pops right out, and very little of the thinset sticks to the old underlayment.
Whats with that? Should I leave this underlayment, or lay backerboard over it. It looks like backerboard, but why doesn't the old thinset stick to it?
I've got 2x12 joist 16" on center.

Thanks
Pics to follow.
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Unread 10-28-2005, 07:57 AM   #2
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If it is backerboard, the previous tile setter may not have wiped the surface with a damp sponge before applyiing the thinset, or he may have backbuttered the tiles, and not "burned-in" the thinset onto the backerboard.

I'd hate to tear the backerboard out, but you'll want to know that it was installed correctly. Given the problems with the tiles, I would doubt the backerboard installation.

What's the maximum unsupported span of the joists?
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Unread 10-28-2005, 02:22 PM   #3
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joist span

About 12 feet. I uncovered the "Hardybacker" name on the underlayment.

These are before pics.
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Unread 10-28-2005, 03:13 PM   #4
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Are u sure it's thinset, maybe it's mastic or something else?

Are you sure it is thinset, perhaps it was laid with mastic?

Good Luck with your project, and keep the pictures coming... I love pictures of works in progress.

Kim.
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Unread 10-29-2005, 01:01 AM   #5
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mastic

Whatever it is, it sure comes up easy
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Unread 10-29-2005, 08:47 AM   #6
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Did you uncover any of the joints? Were they taped and mudded?
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Unread 10-30-2005, 11:29 PM   #7
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don' t know yet

I haven't pulled enough yet. I decided to work on the landscaping instead.
Bathroom burn-out set in.
I'll be back in it tomorrow. Why? What will mud and taped joints reveal?
I did notice that it was nailed down, not screwed.



Thanx
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Unread 10-31-2005, 09:07 AM   #8
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hardibacker ceramic

The logo on the underlayment says "Hardibacker ceramic".
Can I still use it?
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Unread 10-31-2005, 11:31 PM   #9
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Taped and mudded joints might be an indication that the CBU was installed correctly. Not a guarantee, but a good indication.

My opinion; worth price charged.
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Unread 11-13-2005, 08:40 PM   #10
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Mud deck too lean...

I've done my second mud deck over my pan liner. I think I may have mixed too lean on the portland because the surface is sandy. I can bore a hole with a screw driver without too much effort. It's solid, packed, and feels hard ( I'm talking about my mud deck here). If I rub it with a stone, the surface turns sandy. I used 5 shovels of sand to 1 shovel of portland. The sand is heavier than the same volume of portland. I kicked in a little extre portland to be sure. I used silica sand. What do you think?
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Unread 11-13-2005, 09:27 PM   #11
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Quote:
( I'm talking about my mud deck here)
Well, if you're rubbin' it with a stone, I should hope that's what we're talkin' about.

We ain't pourin' concrete here, Mark, we're "pourin'" deck mud. Ain't s'posta feel the same. You're fine. Pewt some tile on there and stop pokin' it with a screwdriver.

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Unread 11-13-2005, 10:50 PM   #12
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ah - the funniest thread I've seen in a while. LOL! First off, I laughed out loud when I saw the first picture. HA HA - A prestine bathroom with a bag of tools and SLEDGE HAMMER sitting in the middle of the floor. Something you NEVER want to see.


And the mud comment. Ah, you boys make me laugh. "I don't understand why when I use the sledge hammer on my slope, it comes apart." bwahaha.. I love the "stop poking it with the screwdriver" bit.

Seriously though, that is a nice bathroom. I want one. How much to ship it here? (grin)

sw (shawn)
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Unread 11-13-2005, 10:57 PM   #13
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Too late

Too late to ship it. Most of it is at the dump.
I'll throw some in progress pics up soon.
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Unread 11-14-2005, 07:01 PM   #14
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Mark, I think you're okay. Deck mud always has a sandy appearance on the surface. It never looks slick like other concret finishes.

Just for future arrivals, don't use silica to make your mud. Use masonry sand or concrete sand if you can get it.
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Unread 11-15-2005, 07:36 AM   #15
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progress

Moving right along. The carpenter built the surround for the shower and tub.
I'll be using Palasaides Travertine with a versaides pattern.
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