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Unread 03-05-2007, 03:27 PM   #1
mgb_mets
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Fill beneath threshold?

Good afternoon. I have a question (hopefully relatively simple) that I'm sure someone can help with. I retiled my master bath this weekend, tiling ceramic atop an existing (3/4" thick) mortar bad. I had removed the old tile, and removed an existing marble threshold (5", 'hollywood' style with one ramped edge; when I took it out the mortared 'ramp' below came out with it) at the transition to the carpeted bedroom. Now I have a five inch gap and need toreplace the threshold. I have a new threshold that matches the old.

My question: what is the best way to 'build up' beneath the threshold to to the proper height? I don't think thinset can be applied that thick, correct (3/4" mortar+thinset+tile on the high side) Even with the angled side on the threshold it will have to be installed at a pitch to make the transition. I don't have any experience laying out mortar or anything, and am relatively new to all this, so the simpler the better. Are there any premixed products that I can trowel down and make the proper ramp foundation?

Thanks in advance for your help!!

Matt
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Unread 03-05-2007, 03:32 PM   #2
Tool Guy - Kg
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Welcome to the forum, Matt.

Why not just build-up the missing mud bed under that threshold with a layer of plywood?

You mentioned pre-mixed products. They aren't a wise choice for the floor (or for a number of locations for that matter). I'm hoping your new floor tiles aren't stuck down with a pre-mixed mastic.

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Unread 03-05-2007, 03:42 PM   #3
mgb_mets
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Thanks for the quick response.

No, I used a conventional thinset for applying the new tile.
Are you suggesting that I should build and nail down a plywood 'ramp' foundation, then thinset the marble directly to that?
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Unread 03-05-2007, 03:44 PM   #4
MudMaker
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Welcome Matt,
Just had to say that..... Like you haven't heard that before... My son's name is Matt too.....

Like Bubba said, we hope you didn't use any premixed thinset (Mastic) on your other tiles.. Thinset in dry form is easy to mix and galaxies better...

Drying is the problem with Mastic - it takes forever.. Are you still able to move the tiles?
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Last edited by MudMaker; 03-05-2007 at 05:51 PM.
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Unread 03-05-2007, 03:45 PM   #5
Tool Guy - Kg
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It won't hold so great over time if you thinset it directly to plywood. Build up the ramp with plywood nailed in position. Then use thinset to install a piece of cementboard or Ditra......then install the marble with thinset.
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Unread 03-05-2007, 03:48 PM   #6
mgb_mets
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I haven't checked today, but it has been 48 hours since I laid the last tile. I don't think there will be any movement when I get home and check.
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Unread 03-05-2007, 05:12 PM   #7
jadnashua
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You should be fine...you just threw the others when you mentioned premixed to try to set the theshold...sounds like maybe a piece of 1/2" ply, 1/4" cbu may be about right to get the threshold where you want it. If the amount of thinset is less than 1/4", regular stuff would be fine. If you need more than that, consider 1/2" cbu or a bag of medium set mortar - it has more sand in it and can be installed thicker - typically up to 3/4", but you need to check the specs to be sure.
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Unread 03-05-2007, 05:53 PM   #8
MudMaker
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Matt,

Quote:
No, I used a conventional thinset for applying the new tile.
Great!!!!! You musta been typin the same time I was axing...
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