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Old 10-15-2012, 08:53 PM   #1
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Reinforcing subfloor around toilet *PICS


Looking for some input as to whether or not this would be a sufficient job. Thanks. Appreciate the help I've received in the past.


Pic 1: 1974 Ranch with Post and beam construction (No joists supporting the toilet and oversized hole currently. Subfloor is T&G dimensional lumber)

Reinforcing subfloor around toilet *PICS-bathroom-job-original.jpg

Pic 2: Larger square hole cut out, then 2X6 joist installed right up to cut (View from crawl space looking up at bottom of floor)

Reinforcing subfloor around toilet *PICS-toilet-2x6.jpg

Pic 3: Sistered joist added to act as nailer for new subfloor

Reinforcing subfloor around toilet *PICS-toilet-2x6-2.jpg

Pic 4: Additional blocking added to act as nailer

Reinforcing subfloor around toilet *PICS-toilet-3.jpg

Pic 5: New subfloor patch added, T&G remnant from house or layers of plywood to obtain same width of existing subfloor.

Reinforcing subfloor around toilet *PICS-toilet-2x6-3.jpg

Pic 6: Blocking removed to show how pipe sits

Reinforcing subfloor around toilet *PICS-toilet-2x6-4.jpg


Last edited by Didymus21; 10-15-2012 at 10:01 PM.
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Old 10-15-2012, 09:03 PM   #2
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Reinforcing subfloor around toilet *PICS


No clue why your making a square hole for a round pipe.
Is the subfloor rotted out now and your just trying to patch it together?
If you used 3/4 Advantec subflooring there's really no reinforsement need.
If you feel for some reason you need to add something no big deal just add a couple of single 2 X's one on each side.

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Old 10-15-2012, 09:13 PM   #3
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Reinforcing subfloor around toilet *PICS


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Originally Posted by joecaption View Post
No clue why your making a square hole for a round pipe.
Is the subfloor rotted out now and your just trying to patch it together?
The current hole is oversized for a closet flange. Don't ask me why the previous owner did that. I bought the place without the toilet installed and knew this would be a repair. I suspect it had been rotted out and cut previously.

I'm also reinforcing the floor for tile because it's overspan with the post and beam. That's another reason why I'm adding the joist.
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Old 10-15-2012, 09:27 PM   #4
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Reinforcing subfloor around toilet *PICS


Then why would you not just cut out the subfloor and install a new patch, this time with a nice round correct sized hole?
We have to keep guessing like this when there's no picure of the floor your working on.
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Old 10-15-2012, 09:52 PM   #5
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Reinforcing subfloor around toilet *PICS


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Originally Posted by joecaption View Post
Then why would you not just cut out the subfloor and install a new patch, this time with a nice round correct sized hole?
We have to keep guessing like this when there's no picure of the floor your working on.
I don't see why posting a pic of the actual floor will make a difference. I drew it in the program fairly accurately with better visuals and angles of the issue than a picture could yield. I added information to the original post for clarity.


Cutting out the subfloor is exactly what I proposed to do. I wanted to know how to properly support the patch that I'd be adding, since it was T&G subfloor over post and beam with a large unsupported span below the toilet.

Reinforcing subfloor around toilet *PICS-toilet-upper.jpg


Reinforcing subfloor around toilet *PICS-toilet-lower.jpg

Here you can see I've already installed the ledger board in anticipation of putting more joists in.




It'd be very much like this video I found (only waste pipe would run up through a round hole. http://www.youtube.com/watch?v=_BPfNVOi4YE&t=1m12s

Last edited by Didymus21; 10-15-2012 at 10:02 PM.
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Old 10-15-2012, 10:19 PM   #6
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Reinforcing subfloor around toilet *PICS


i like your idea. so much so, that is how i plan to do mine. toilets take a lot of abuse and weight.
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Old 10-15-2012, 10:27 PM   #7
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Reinforcing subfloor around toilet *PICS


what kind of floor do you plan to install in the bathroom? if you plan on tiling you will have to cover the whole floor with plywood before putting down cement board or membrane and wouldn't really have to do anything to the subfloor other then the reinforcment underneath like you planned.

Last edited by DannyT; 10-15-2012 at 10:29 PM.
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Old 10-16-2012, 12:09 AM   #8
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Reinforcing subfloor around toilet *PICS


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Originally Posted by DannyT View Post
what kind of floor do you plan to install in the bathroom? if you plan on tiling you will have to cover the whole floor with plywood before putting down cement board or membrane and wouldn't really have to do anything to the subfloor other then the reinforcment underneath like you planned.

It'll be tile. Plan on Plywood -> Ditra -> Tile. The beams have nearly a 4' span, so I'll be reinforcing in addition to just the toilet area.

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