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Old 06-13-2019, 05:59 AM   #61
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Most likely it will be glued like you can't imagine. If you used liquid nails and it didn't skim over before you touched the process. You will have to chisel what's left flat. I think best to enlarge your hole just enough to get in some support pieces. Even 3/4" plywood scraps glued and screwed will give decent support for a tighter fitting toilet hole patch
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Old 06-13-2019, 06:04 PM   #62
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You can cut a smaller section out even to the joist on the sides and +/- 8” either side. That will allow you to install blocking along the edges along with a coulple on either side of the pipe as shown below. This will give you a strong mount for the the replacement subfloor section along with the ter’let flange.


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Old 06-14-2019, 03:31 PM   #63
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Update;
I am going to install 1/4 plywood over the existing 3/4” plywood. This will accomplish two things: reduce deflection essentially making the subfloor 1” thick, and I can cut this second layer of 1/4” plywoood so that there is an even smaller hole perfectly around the toilet flange. Good idea guys? What do you think?
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Old 06-14-2019, 04:04 PM   #64
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Second layer is a good idea! However, there is no acceptable 1/4” plywood for the application you describe. 3/8” is the minimum size and is often unworkable due to flexing and warping (and that’s if you can get it).

Recommend you consider 1/2” plywood of the appropriate grade and type.
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Old 06-14-2019, 04:05 PM   #65
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Hey PC this proposed 1/4” would go over existing 3/4” plywood. That still doesn’t work?
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Old 06-14-2019, 04:10 PM   #66
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Nope, per the Tile Council North America 3/8” is the minimum for a second layer.

Recommend you read the article for the full details:

https://www.johnbridge.com/vbulletin...0&d=1545405580
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Old 06-14-2019, 04:16 PM   #67
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So that would disturb even the integrity of the existing 3/4” plywood?
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Old 06-14-2019, 07:55 PM   #68
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The 1/4” material you commonly see in home centers is luan and is typically used as underlayment for vinyl floor to provide a smooth surface. This material does not have the compressive strength required for tile or stone. So to answer you question, it would make your currently acceptable 3/4” subfloor completely unsuitable for tile.

While the TCNA allows for the use of 3/8 plywood as the second layer, I’ve personally never used it. The 1/2” material is readily available and much easier to install. The thickness of the 1/2” material is actually about 7/16” so the delta from the 3/8” material is minimal.

So if you want to add a second layer to address the wide spacing of your joists, that’s a good idea. Install 1/2” plywood rate B/C or better (hopefully CX will catch this if I’ve called out the wrong grade ) and install following the instructions I linked earlier and you’ll be in good shape.
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Old 06-14-2019, 08:14 PM   #69
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All the 3/8th" material at your home center is nominal, too, PC. Advertised as only 11/32nds" these days, which means it's likely even thinner given the allowable tolerance in the industry. Rare that I see any of it that doesn't look more like a potato chip than a flat wood panel. Alas, progress!

Minimum I'd use for any part of a subfloor would be nominal half-inch, too.
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Old 06-14-2019, 10:15 PM   #70
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Would you guys mind pointing to me a link at Home Depot for the exact 1/2” board I should buy? I go to their website and there’s like five different ones. Thank you!
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Old 06-14-2019, 10:32 PM   #71
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This one will work. Hopefully they carry the same in your local store.
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Old 06-14-2019, 10:39 PM   #72
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Kevin that’s 3/8, don’t I want 1/2”?
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Old 06-14-2019, 10:47 PM   #73
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If you're using 1/2", then go with this one.
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Old 06-14-2019, 10:51 PM   #74
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Thank you very much good sir, don’t you think the 1/2” is the way to go over the 3/8?
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Old 06-14-2019, 10:53 PM   #75
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If you've got the height to spare, thicker plywood is always better.
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