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Unread 12-03-2019, 11:31 AM   #1
Sbush81
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DITRA over osb?

Ok..long time reader...love the forums...long story short a wax ring leaked in hall bath...ruined isb sub floor...tore up all tile and really really thick mud bed...braces and replaced bad section with osb...should inlay down a thin plywood then ditra over it? Plan is standing shower tore the tub about too!! Have read it can be done over either which way do yall think is the safer option?

Thanks Steve

Plenty more dumb questions to follow ????????
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Unread 12-03-2019, 12:13 PM   #2
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Welcome, Steve.
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Have read it can be done over either which way do yall think is the safer option?
Don't understand the question. Either of which ways? I see only one mentioned.

If you plan to install ceramic tile over that floor, I'd recommend a second subfloor layer of nominal half-inch plywood over the patched floor I see in your photo. That presumes that your joist structure is adequate for such a tile installation.

My opinion; worth price charged.
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Unread 12-03-2019, 05:14 PM   #3
Lazarus
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I agree with CX. Put another layer of plywood and THEN use the DITRA. You "should" be good to go at that point with tile.
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Unread 12-04-2019, 08:18 AM   #4
Sbush81
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Thanks so much for the replies...I did indeed brace under the patch..Yes tile is going on the floor so I will get some half inch plywood and cover floor...I'll update with pictures when I Get done...

Thanks
Steve
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Unread 12-04-2019, 08:29 AM   #5
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Be sure that first layer is screwed down to the joists, Steve, and then orient the 1/2" (exterior glue/exposure 1, BC) layer so that the long edge runs perpendicular to your joists, and try to overlap the joints in the 1st layer by at least 6". Screw the 2nd to the 1st, avoiding the joists, using at least 1 5/8" construction type screws.
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Unread 01-17-2020, 11:13 AM   #6
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Ok fellas...slow moving here....got it back in gear!!! About to lay down 1/2 exterior grade plywood...I'm stuck in the dang gone toilet flange!!!I have measured my other bath that has same toilet and the bolts that hold the bowl in the flange are about 12.5 inches from the sheet rock....Just want to double check and make sure this seems about right? I'd hate to kay the panels cut the hole and my toilet not fit....Again I'm a diy guy and actually am enjoying the work as a mental get away.....pics to follow!!!
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Unread 01-17-2020, 11:22 AM   #7
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Welcome back Steve,

So hold on a sec, is your toilet flange still installed to the existing subfloor? Gots a pic for us?
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Unread 01-17-2020, 01:27 PM   #8
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No sir...currently not installed....I had measurements and cannot find them now of course....I have measured 2nd bathroom toilet....about 12.5" from wall to flange bolts on toilet...my reasoning was to place new hole having bolts be 12.5" from wall.....here is a lic of other bathroom....I'm open to being completely wrong.....thank u so very much....
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Unread 01-17-2020, 01:30 PM   #9
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Pic of 2nd bathroom toilet
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Unread 01-17-2020, 01:39 PM   #10
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12.5 is fine, Steve. The norm is actually 12 in. from the framing, but a little extra just means there'll be a wee bit more space behind your toilet tank.
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Unread 01-17-2020, 01:48 PM   #11
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Hot dog I'm rolling now...lol....I hate to ask you guys simple kinda dumb questions....but I'd rather measure 5 times and cut once....I'll have this plywood layed and done by tomorrow and post pics to show the progress.....Gonna buy a pre fab shower base because making one is clearly beyond my realm of skill.....lots of pics and updates to come....again I thank you all for the help and guidance.....so glad I found this site!!!
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Unread 01-17-2020, 04:29 PM   #12
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John, I think you'll find the standard WC drain location center to be 12" from the finished wall rather than from the framing, or most commonly 12 1/2" from the back wall framing.

My opinion; worth price charged.
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Unread 01-18-2020, 02:03 PM   #13
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I hate to mention this now but a layer of plywood underlayment over the existing floor isn't necessary. You can go right over the existing floor assuming it meets industry standards. The Ditra handbook covers this.

Also, I hope you change out the angle stop for that toilet.
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Unread 01-25-2020, 09:27 AM   #14
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Update...Yes everything will be replaced....I've got the plywood down and holes cut...I was hoping to just by a shower pan 34x60 and be done with that portion...After lot of reading seems to be a trend of cracking? Maybe just poor installation...What are your thoughts? Any recommendations of shower pans? Thanks again!!!
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Unread 01-25-2020, 09:29 AM   #15
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Thumbs up

Shower walls will be 1/2 cement board...using proper screws...fiberglass mesh tape....and couple coats of red guard...sound good?

Lots of reading....and this installation should not require felt paper or plastic behind cement board?

I found a steel porcelain shower pan 34×60....I feel safer with this option....
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