What bit and screws for Toilet Flange on Porcelain over wood subfloor?

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LLPA

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My brand new toilet flange is sitting on top of 3/8" porcelain tile which is on top of 1 1/4" wood subfloor.
In order to screw flange to floor do I use diamond bit until I hit the wood and then switch to a regular bit?
And do I use stainless steel screws? Not Tapcons?
Thanks!
 

wwhitney

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Yes, use a clearance hole sized tile or diamond bit just to get through the porcelain. Then select a pilot hole sized drill bit for the wood subfloor, and use a stainless wood/sheet metal screw at least 1-1/4" long, 1-1/2" would be slightly better.

Cheers, Wayne
 

Breplum

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Brass or SS screws. but really Tapcon are coated and might be considered non-corrosive.
Even the "coated" deck screws that are for pressure treated lumber are relatively non-corrosive like GRK brand.
 

LLPA

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Yes, use a clearance hole sized tile or diamond bit just to get through the porcelain. Then select a pilot hole sized drill bit for the wood subfloor, and use a stainless wood/sheet metal screw at least 1-1/4" long, 1-1/2" would be slightly better.

Cheers, Wayne
Thanks! Picking up diamonds tip bit today.
Which scree size do you suggest? #10?
 

Treeman

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And be careful when drilling the tile that you do not blow through it into the wood and end up with an over sized hole in the wood.
 

LLPA

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Done, thank you!
No cracks...just took a long time drilling through porcelain with Harbor Freight diamond bits.
Did go faster once I switched to Milwaukee one.
 
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