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Old 01-09-2017, 07:22 AM   #1
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Subfloor Thickness for Tile


My 2x10 joists are spaced 16" OC in an ~8'x8' area. I plan on using 3/4" plywood glued and screwed to the joists every 8". Thinset with a 1/4" CBU on top of it screwed every 8" in both directions. Thinset and tile.

Is 3/4" plywood subfloor adequate for this application? What is preferred/stronger, plywood or OSB? Everything else above sound right?

Also, if I need the height, anything wrong with using a 1/2" CBU for floor applications?

Thanks

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Old 01-09-2017, 11:15 AM   #2
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Re: Subfloor Thickness for Tile


What's the unsupported span of the joists?

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Old 01-09-2017, 01:32 PM   #3
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Re: Subfloor Thickness for Tile


Unsupported span is 91" between load bearing wall on each side.
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Old 01-09-2017, 02:22 PM   #4
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Re: Subfloor Thickness for Tile


OK, joists' span is fine even without knowing their species or grade. If the " ply you're planning is 'subfloor grade', you're good for ceramic tiles. Some people think Advantech OSB subfloor is better, both are good.

You are free to use " CBU if you need the height. Alternatively you could install ⅜" ply and " CBU or drop the CBU and use ⅛" Ditra instead. What type/size tiles are you planning?

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Old 01-09-2017, 02:45 PM   #5
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Re: Subfloor Thickness for Tile


Going with a 1" hexagon (honeycomb) mosaic mounted on mesh in 10 x 12 sheets.

What exactly is "subfloor grade" plywood? It looks like the AdvanTech is available in my area. I'm not too worried on price here, I just want whatever is best. Is gluing and screwing to the joists correct, with deck screws?

If I stack plywood (3/4 with 3/8) or even 1/2 with 1/2, do I glue and screw, or just screw?

I'm not opposed to using Ditra, but I have had success using 1/4" CBU in the past, so was planning on it again.
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Old 01-09-2017, 04:01 PM   #6
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Re: Subfloor Thickness for Tile


Looked into the Advantech a little more and I think I'm sold on it. Thanks for the help
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Old 01-09-2017, 04:13 PM   #7
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Re: Subfloor Thickness for Tile


Advantech is very good. Follow their directions.

Quote:
Going with a 1" hexagon (honeycomb) mosaic mounted on mesh in 10 x 12 sheets.
I still don't know if it's ceramic or stone.

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Old 01-09-2017, 04:56 PM   #8
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Sorry Jazz, it's a ceramic. Any other advice is appreciated. I plan on keeping the subfloor about 1/4" away from the wall studs on all sides, using a polyurethane construction adhesive as suggested by advantech and deck screws.
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Old 01-09-2017, 05:26 PM   #9
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Re: Subfloor Thickness for Tile


Deck screws, they say to use screws?

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Old 01-09-2017, 05:28 PM   #10
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The video on their website specifically says that screws are preferred over nails
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Old Yesterday, 06:57 AM   #11
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Re: Subfloor Thickness for Tile


I ended up using the Advantech. The T&G fit together nicely and the screw pattern was a nice bonus. Glued and screwed, the floor feels really solid.
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