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Unread 03-06-2009, 12:41 PM   #1
designs
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NH bath remodel

WOW! the expert info here and in John's books is amazing!
Need subfloor/underlayment/construction recommendations for 7'x7' second floor bath, 2x10s on 16" centers, although there is one point near the center of the room where 2 2x10s are sistered together 6" from one joist and 11" from the other, all with a 10' span in a 24-year-old new england cape. Want to use electric radiant heat mat, Ditra, 12x12 porcelain floor tile. In 6 of the joists, 1 1/4" holes for the old water lines had been drilled 1-2"from the bottom of the joists about 6 1/2' from the outside 2x6 wall. Planning a neo-angle kerdi shower with 24" wide side walls to the ceiling, closing shower drain for footsoaking, not a deep roman tub,( maybe a 12" high curb?) . plumber is talking about cutting into joists near outside wall to run waste line.At the door, I'll be meeting carpet over 3/4" particle board and 3/8" plywood.
thanks for the help, Peg

Last edited by designs; 03-06-2009 at 12:57 PM. Reason: Additional info
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Unread 03-06-2009, 02:22 PM   #2
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NOW is the time to make it waterproof!!!
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Unread 03-06-2009, 03:13 PM   #3
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Your subfloor should be 3/4" plywood or OSB. You can add another layer of plywood if you want to get the floor heights to match. The second layer should not be less than 3/8" though.

A lot of folks like to embed their wire heat in SLC. If you go that route, follow the SLC' manufacturer's recommendations to the letter, as SLC can be tricky. I think it less risky to embed the wire in modified thinset, since modified thinsets are designed to stick to plywood. The disadvantage is that you have to fill areas without the heat, too. Can be tedious, that.

Schluter has a tub drain fitting you should look into for your foot soaker.
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Unread 03-06-2009, 04:08 PM   #4
designs
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Thanks for the quick response. Plumber comes tomorrow.
I have Sturd-I-floor 3/4" (its probably 23/32)t&g available to me.
Will go for the modified thin-set with the heat mat, was ok last time.
Re Kerdi closing drain, I saw a JB post on using a standard tub overflow equipped with a barrel stopper. Anyone have any more thoughts on the overflow?
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Unread 03-07-2009, 08:22 AM   #5
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Sturd-i-floor is good.
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Unread 04-06-2009, 03:57 PM   #6
designs
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Had to get ACX -- sturd-i-floor didn't really exist when we went to pick it up.
Given the small size of this room, do I need 1/8" gap between the two sheets of plywood, or just around the perimeter of the room?
Thanks,
Peg
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Unread 04-06-2009, 04:01 PM   #7
bbcamp
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You need the 1/8" gap between sheets, as well as the 1/4" gap around the room. If you got tongue and groove, just slip the sheets together without driving them home with a sledge hammer. If not T&G, just leave a slight (1/8") gap.

If you had the time to kill, you just may see that gap close up on it's own as the plywood acclimatizes to your room. Or, not.
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