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Old 01-08-2011, 09:05 PM   #1
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Removing rotten bathroom subfloor


I have just discovered after trying to replace a toilet thAt the subfloor in our upstairs bathroom is rotten around the soil pipe. I have just finished adding shutoffs to the vanity so I could remove it and the flooring. Now that I have a better look at the floor I see that it is pretty bad looking up to the wall which borders my bedroom, and to the tub. I don't want to have to tear out the tub ... This was supposed to be a 30 min job to fix a toilet. Where should I tear the subfloor out to.
Also I plan to install slate tile after so I understand that also requires specific underpayment.

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Old 01-08-2011, 09:10 PM   #2
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Old 01-08-2011, 09:13 PM   #3
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Removing rotten bathroom subfloor


Pics are here
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Old 01-09-2011, 07:31 AM   #4
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Removing rotten bathroom subfloor


Please help someone
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Old 01-09-2011, 08:45 AM   #5
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Removing rotten bathroom subfloor


Please see my other thread...here are the pics... I need to know how far to rip out the subfloor...I am laying slate tile after
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Old 01-09-2011, 09:18 AM   #6
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Removing rotten bathroom subfloor


If it were me, I'd pull the tub and take all the wet wood out.
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Old 01-09-2011, 09:25 AM   #7
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Removing rotten bathroom subfloor


Jay---Yuck! You are not alone--this is very typical damage----

You will need to cut that back until you find good solid subfloor--Find the location of the floor joists-
Cut the bad flooring down the center of the joist--use 2x4 blocking under any seam that is not supported by a joist--Screws are best for fastening down your new plywood--Do not use OSB-it is to weak for slate-

After the subfloor is patched,add another layer of 1/2 inch B/C plywood on top,for proper stiffness.

Then 1/4 inch durrock or wonder board,set in thinset---I'll see if any one else has any suggestions.--Mike--
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Old 01-09-2011, 09:53 AM   #8
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Removing rotten bathroom subfloor


The wood right by the tub does not seem to be wet just black on top from old adhesive. I've been gouging at different spots to test the wood and it seems to just be ok right beside the tub and wall, although it's definitely rotten around the pipe and a little to he right of it.
I would like a nice new base to lay my slate on anyway. Just not sure how far to cut the subfloor. It's about. 25 square feet

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Old 01-09-2011, 09:58 AM   #9
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Also the joists run perpendicular to the way the tub runs so you can visualize where they are in relation to the picture
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Old 01-09-2011, 10:08 AM   #10
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Removing rotten bathroom subfloor


Is that a metal tub or a plastic/fiberglass tub?

If not metal I contend that the outside edge of the tub is not load bearing. Even if it is load bearing and if you have to undermine to get rid of all the rotten wood for not more than six inches along the front of the tub, then you are still okay.

I would leave at least two inches of wood in front of the tub.

It is possible that the existing subfloor is not thick enough to support slate. Too much give and the slate will crack. You might get around that by adding more joists for stiffness' sake. Extra framework of wood below and just in front of the tub would let you end the extra joists there and not remove the tub or the ceiling below.

Or add another layer of subfloor. The edge of the tub might look funny now that part of it is below floor level.
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Last edited by AllanJ; 01-09-2011 at 10:15 AM.
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Old 01-09-2011, 10:27 AM   #11
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The tub is a fiberglass whirlpool. The existing subfloor is most likely original '78, and is 3/4 ply. I have a circular saw and a recip. Saw should I leave 2 inches in front of the tub and go right to the wall everywhere else?
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Old 01-09-2011, 10:34 AM   #12
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Jay--You have duplicate posts going on the same subject---That leads to confusion--I answered this question elsewhere--Please don't do that.Mike
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Old 01-09-2011, 10:42 AM   #13
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Quote:
Originally Posted by oh'mike View Post
Jay--You have duplicate posts going on the same subject---That leads to confusion--I answered this question elsewhere--Please don't do that.Mike
Ayuh,... That duplicate thread Mike mentions is Right Here...
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Old 01-09-2011, 11:45 AM   #14
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Sorry about the duplicates.. My head is in too many places right now and the wife is driving me crazy. So just to clarify I should put down 3/4 ply subfloor. Then stagger the joints and lay a 1/2 of underlay, and then set 1/4 durock on a bed of thinset. And then I would assume a medium set on top to set the slate?
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Old 01-09-2011, 12:07 PM   #15
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Removing rotten bathroom subfloor


Had the exact bathroom except mirrored, heres what I did, but I removed the bath tub and built a custom shower. All the wood missing was rotten, joist were OK.

Removing rotten bathroom subfloor-100_0075b.jpg

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