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Old 03-24-2013, 10:05 AM   #1
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Bathroom subfloor


I'm redoing my bathroom and had a question about the subfloor. I'm halfway done ripping up the old subfloor......the original subfloor is 3/4 and is great shape. My plan is to lay a 3/4 plywood down, then ditra, then 12/12 tile over that. Is that a good plan, or should I lay a backer board down then ditra over that? Wasn't trying to raise the floor up to much.


Bathroom subfloor-image-3467870928.jpg
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Old 03-24-2013, 11:29 AM   #2
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Add two screws to anyplace those old boards touch the floor joist.
Use Advantec 3/4 T & G instead of plywood, there's a nailing pattern right on the sheets, do not have the seams line up with the floor joist below.
Use ring shanked #8 nails or ceramic coated decking screws.
No glue!
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Old 03-24-2013, 06:26 PM   #3
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Joe loves Advantech for almost anything. Ply underlayment would be great too. You don't need 3/4", but the thicker the better if you can use it.

Ditra takes the place of concrete backer and is much better, IMO. Tell us about the joists so someone can refer to a span chart.

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Old 03-26-2013, 10:37 PM   #4
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The joists are 2/8 16 on center. Thanks? I grabbed some 3/4 in ply and glued and screwed. I sat the tub in position, but there is a small gap where the back of the tub meets the wall. How do I make up that difference? Should I run my concrete board all the way to the floor?

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Old 03-26-2013, 11:33 PM   #5
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That looks like you installed CXD grade plywood and it's also does not look like T & G.
CDX is full of voids in the plys and will cause problums with soft spots under the flooring.
Tile board should not behind that tub, it needs to go over the lip on the top of the tub.
One of those walls is going to have to be shimmed out depending on which way you move the tub over.
http://www.bing.com/images/search?q=...res&FORM=IGRE#
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Old 03-27-2013, 12:01 AM   #6
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Jaosnh,

Joe's right I'm afraid. You grabbed the cheapest ply they had, didn't you? You are not building a shed, it's your home.

You're gonna hafta tweak the tub too, then shim the walls as Joe said.

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Old 03-27-2013, 12:30 AM   #7
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That plywood also never should been glued down.
Glue can cause gaps.
Only time you use glue is then your attaching a subfloor to the joist.
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Old 03-27-2013, 09:33 AM   #8
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Jaosnh, I am going to do the same, renovating a small washroom. Can you tell me some basic things:

Do you really have to gain access at the floor below/bottom of tub for drain installation?
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Old 03-27-2013, 09:50 AM   #9
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Thanks for the info u guys.....guess ill be removing the subfloor tonight
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Old 03-27-2013, 09:58 AM   #10
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Quote:
Originally Posted by bangan
Jaosnh, I am going to do the same, renovating a small washroom. Can you tell me some basic things:

Do you really have to gain access at the floor below/bottom of tub for drain installation?
I'm not a expert just a avid DIY'er. But u should not have to if everything is at the same level. In my case the tub sat a lil higher than my drain so I had move my drain a lil. And I have access to the drain and stack from the basement, it's cast iron, so I'm replacing it all with PVC.
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Old 03-27-2013, 09:58 AM   #11
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Bengan please go back and add your own post, and take the time to go back and add your location to your profile.
Go to Quick links to edit.
Very important when asking code or insulation questions.
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