closet flange

[imported_bdweller]

In finishing the bathroom in my basement, I have run into a problem. The builder left a capped 4 inch PVC drain pipe in the floor on which to install a toilet. The top of the drain pipe (when the cap is removed) is about 3/4 of an inch below the floor surface. The pipe is in the center of a cylindrical hole in the concrete floor. The builder put a plastic mold which encircles the pipe when pouring the concrete to keep from burying the pipe in the concrete. The problem is that the holes in the closet flange for fastening it to the floor do not come out far enough on the flange to reach the concrete floor. The holes in the flange are over the empty area around the pipe. I have been told by one person that as long as the flange (which is PVC) is cemented to the drain pipe, there is no reason to fasten it to the concrete floor.

I have looked at a lot of closet flanges and all seem to have the holes to fasten them to the floor in the same place. Do you agree that the PVC cement is adequate to hold down the flange?

[Wgoodrich]

Most often a toilet flange is installed on the end of the 4" pipe. This toilet flange should have a thin plastic plate that is sized equal to the inside of the 4" pipe that pops out of the inside of that toilet flange when you wish to install the toilet. You are not removing the toilet flange that is supposed to be there are? If this cap you are speaking of has a flat plastic plate with holes in it then these holes are for mounting the toiled not just mount to the floor.

As long as the flange is not capable of receding into the under floor area you are fine. The flange will have a wax ring that is squeezed between the toilet and the flange with the toilet settin on the wax ring pushing downward against the flange. The flange can not come up and you are fine as long as it can't go down releasing the pressure of the toilet squeezing the wax ring to the flange.

Let us know how you come out.

Wg

[imported_bdweller]

The cap on top of the 4" pipe I spoke of is temporary to block the sewer gases. It will be removed when the flange is installed. I purchased a new PVC flange to be installed on the existing pipe. I believe you confirmed the recommendation of the person I talked to in that you say that the closet flange does not need to be fastened to the floor. It will be cemented into place on the pipe.

Thanks for all your help. All the advice you've given me has been very helpful.