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Unread 08-09-2013, 12:44 PM   #1
sandking150
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Master Bath Project

Hi all,

I haven't yet finished my main bath project but wanted to get the subfloor down in the master even though we won't be doing it for awhile. I'm having the floors refinished upstairs and would rather not carry around plywood once all the furniture is in.

So here's my situation:
  • I currently have 5/8" ply on top of 2x8 joists. Now these joists run approximately 20 ft, with a load bearing wall halfway (at 10'). From that wall to the end of the run (directly below this bathroom) I doubled up all the 2x8 for strength.
  • I plan on tiling this floor with 12" or 13" porcelain.
  • I've framed in the showers wet wall ontop of this plywood and all the rough plumbing is in. I have not built the shower curb yet, as I would put that ontop of my subfloor once the new height is established.
  • This tile will meet with a hardwood floor.
  • I'd rather not cutout this floor and replace because of the wetwall being framed already and if I cut out around the bottom plate I can't fit any blocking (because of all the plumbing) to attach the new subfloor to.

My questions:
  1. Should I use 3/4" T&G Dryply as my subfloor screwed to the joists? OR
  2. Should I use two layers of 1/2" B/C? First layer screwed to the joists and second layer screwed to the first.
  3. If I use 3/4" T&G Dryply should I add an additional 1/2" B/C Grade on top or just Dirta ontop of the subfloor?

Thanks in advance.
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Unread 08-09-2013, 12:51 PM   #2
cx
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1. Yes.

2. I would never recommend use of half-inch plywood for a first layer of subflooring.

3. I would add the second layer of subflooring. Schluter would approve the single layer for your Ditra installation.

My opinion; worth price charged.
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Unread 08-12-2013, 09:21 AM   #3
sandking150
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Thanks

If I add the 3/4" subfloor (on top of the existing) then 1/2", then ditra and tile I should be about 3/4" higher than the hardwood flooring in the bedroom. Does that make sense?
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Unread 08-12-2013, 10:17 AM   #4
chuck stevenson
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Joseph,

Install your 1/2" over the existing 5/8" according to the instructions in the Liberry.

http://www.johnbridge.com/images/mik...-0604.pdf..pdf

Then install your Ditra.
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Last edited by chuck stevenson; 08-12-2013 at 11:10 AM. Reason: Spelling
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Unread 04-01-2021, 10:29 PM   #5
sandking150
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Resurfacing thread

Hello all. Hope this finds you doing well. My wife is finally pushing to get this project going and funds are available. 7 years of staring at an empty bathroom is coming to an end as 4 kids is taxing the only bathroom I finished lol. She's very patient.

The existing floor is as described earlier 5/8" thick ply from the 1950s. I would like to prevent ripping it up because it's under the wall framing.

Someone recommended 1/2" ply added on top and then my Ditra and tile. Is that still acceptable? Not sure if there have been changes since I last posted.

Thank you in advance.
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Unread 04-01-2021, 10:34 PM   #6
cx
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Welcome back, Joseph.

No sense rushing into these things.

If your joist structure is adequate for a tile installation and if your nominal 5/8th" subfloor has T&G edges and is in good condition, then the addition of a second layer of nominal 1/2" subflooring would be a good subfloor for a tiling substrate and a ceramic tile installation.

My opinion; worth price charged.
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