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Unread 01-01-2009, 06:53 PM   #1
Renboy
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basic general install questions

Hi all. This is my first post here, but have done a lot of reading on this site in the last few weeks. I have to be honest and say I'm quite impressed with this forum. I've spent a lot of time on car forums, but it's nicer here since people can respectfully disagree without it turning into a flaming war.

I'll be putting 18"x18" travertine tiles in my kitchen/hallway/entrance and powder room in the next couple of days but have some questions that I hadn't come across. Subfloor is 3/4 t/g osb on 2x10" with 16" centres and the longest span is about 12'. The deflecto is short of the L/720, but when I finish my basement in the summer I'll be putting a support header under the longest section bringing it to under 10'. My plan is as follows:
1/2" plywood screwed to the osb (no predrilling, 400sft = a lot of holes)
1/4" cbu screwed into the plywood over a bed of the cheapest unmodified thinset I can find
self-leveler to fill in any low spots
tiles & grout (1/8" lines)

My questions are:
What length/size of screws for the plywood -> osb?
What size of bead for the unmodified thinset under the cbu?
Should I seal the tops of the tiles before I lay them to save myself trouble grouting? And if so, how imperative is it to keep the sealer off the sides of the tile where the grout will be? The tiles are filled/honed and NOT polished if that makes a difference.
Is the self-leveller at HD any good? Anyone have any recommendations on a better (hopefully cheaper) leveller readily available in Canada?
Any other general comments/concerns?

As a side note, I decided against ditra...actually, I planned on using it, until I saw the price and my wallet decided against it. I have some spare time, no one has some spare money.

Thanks.
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Unread 01-01-2009, 07:11 PM   #2
Brian in San Diego
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Rene,

I'd be a little concerned about putting the header up after the stone is installed. My concern would be in putting too much upward force on the joist structure above while installing the header.

I use 1 1/4 - 1 1/2" deck screws for attaching underlayment to subfloor. There's a thread in the Liberry about CDX, plywood, etc. There's an excellent article in post #3 of that thread. I highly recommend reading it.

I believe most of the manufacturer's recommend using a 1/4x1/4 square notch trowel for thinset under backer board.

I would not use SLC just to fill in low spots...unless the dips were severe. You can skim those areas with thinset.

I have set travertine and limestone and I sealed prior to grouting. If you are careful (which you should be at $50 a quart) you won't get much on the edges. I applied it with a paint brush. If I were doing as much square footage as you are talking about I'd probably use one of those skinny paint rollers.

Brian
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Unread 01-01-2009, 11:29 PM   #3
muskymike
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Hi Rene, welcome! What Brian said.
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