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

[LLPA]

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]

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

 

[Sponsor]

 

[Breplum]

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]

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?

 

[LLPA]

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

And if #10 screw... What size bit /hole saw?

 

[Fitter30]

Shank size 13/64"
Use a diamond 5/16" hole saw and water to keep it cool

 

[Treeman]

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]

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.