Dave Anderson

02:53AM | 02/10/04
Member Since: 10/23/02
41 lifetime posts

What's proper for a toilet flange install: Screw it down to the BackerBoard and tile around it, or tile up to the hole, and then screw the flange down on top of the tile?

Also, is the flange typically glued in to the stack, or just siliconed? This paticular flange inserts inside of the stack.


Dave Anderson

plumber Tom

02:39PM | 02/10/04
Member Since: 05/10/03
801 lifetime posts
Easier to screw it right to the backer board. Use galvanzized drywall screws that are long enough, but watch out for copper pipes. (screwing onto them) Your flange (if it's PVC requires the same primer and glue joint process as any other PVC joint. You may have what's called a slip flange. which means the "slip" is the same OD as the pipe size your using.


07:50AM | 04/29/07
Member Since: 04/28/07
1 lifetime posts
Hi, I must be going through the same process as you. Updating a bathroom.

I too, am in the process of laying backerboard and am unclear about the toilet flange. I got two differnt answers at Lowe's (flush with the tile, on top of the tile), two answers from Home Depot (both said flush with the tile).

Mr. Vila, what's the correct configuration?

Best Regards


08:47AM | 04/29/07
Member Since: 01/24/06
1512 lifetime posts
It never ceases to amaze me how people would actually take the advice from a clerk in a store on how to do electrical or plumbing.

Considering many of these folks work just above minimum wages do you really expect them to know the right job?

For example I pay my top mechanics over $65.00 per HR in the envelope I am sure the old saying you get what you pay for normally is true.

Set the flange even with the tiles and even 1/8 -1/4" below as the toilet horn and wax gasket will take up the difference.


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