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Old 08-30-2012, 11:29 PM   #1
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How to properly mount toilet flange to multi-layered subfloor


Hello all,

I am nearly finished with a bathroom renovation thank goodness, and the time has come to install the thrown. My question is about how to properly mount the toilet flange to the subfloor. The complication is due to our many layers that are as follows:

1. 3/4 plywood
2. 3/8 in plywood underlayment
3. Metal lathe
4. Self leveling concrete (thanks for the help!)
5. Ditra
6. Slate tile

I was wondering if I should use long wooden screws to bite into the wood subfloor or if I would be better of using some kind of concrete bolt since it will be going through 1/4-1/2" of concrete first plus the thinset over and under the ditra. It seems like all videos and forums are for mounting to wood or concrete. I'm not sure how all the layers contribute. I suspect I should use a wood screw, but I wanted to see if you all had dealt with this. I can't imagine my floor is that unique. Also, I know I should use stainless steel, but is there any particular size? Unfortunately the guy at the plumbing supply store wasn't sure how to proceed either.

Thank you in advance for any help. I've never been this excited about a toilet!

Richie

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Old 08-30-2012, 11:41 PM   #2
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How to properly mount toilet flange to multi-layered subfloor


Use a masonry bit to get through to the wood, drill a pilot hole with a reguler bit, then just use brass wood screws. Use the biggest flat head screw you can and still have it flush with the surface of the flange.

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Old 08-31-2012, 07:32 AM   #3
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How to properly mount toilet flange to multi-layered subfloor


Is ceiling under bathroom finished?
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Old 08-31-2012, 11:30 AM   #4
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How to properly mount toilet flange to multi-layered subfloor


thanks joe! it is the crawl space underneath so it doesnt need to look pretty.
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Old 08-31-2012, 03:08 PM   #5
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How to properly mount toilet flange to multi-layered subfloor


If its an open crawl space underneath buy a couple extra sets of closet bolts and run them upside down through the flange and floor then mount the flat washers and nuts under the floor in the crawl space ceiling/floor decking.
they will never pull out that way
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Old 08-31-2012, 03:48 PM   #6
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How to properly mount toilet flange to multi-layered subfloor


Thats not a bad idea. The problem is that space is limited down there. Not much clearance under the commode. I can get down there with my contortionist routine around the pipes . I'll try drilling through masonry layers and putting the wood screw into the subfloor and if that doesnt hold or I accidentally drill through the subfloor (I am betting this will happen) , I have a plan B . Thanks for all the help!

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