We are building a barn with a small bathroom in it. The contractor put in the drain pipe for the toilet and poured a concrete floor. When I went to install the toilet, I found the drain is not perpendicular to the floor. The drain pipe has been cut flush with the floor. All the closet flanges I've found have the flange parallel to the base of the pipe (or perpendicular to the long axis of the drain), so when I try to attach it to the drain, one side of the flange is off the floor. I'm guessing the drain is 10 degrees off perpendicular to the floor. It's a 4 inch drain and I though of buying a 3 inch flange, leaving it loose in the pipe and screwing it into the concrete, but figured there might be a problem with the pipes not fitting tightly.
Any suggestions? Thanks, Dave