I am building a cabin on peer and beam with an o.s.b. floor covered with Hardy backer board and I am applying tile on top of that. When I checked to see if the toilet flange would be far enough from the wall before I put tile where the flange will sit, I realized I didn't allow for the thickness of the wall tile behind the toilet tank when I roughed in the P.V.C. sewer pipe. Now the toilet tank likes a half inch having enough room to sit on top of the toilet. Can I elongate the hole in the floor and push the pipe forward enough to fit the flange on it or will that create to much of an angle in the connection. I thought maybe I could sit the P.V.C. flange at a bit of an angle to level it with the floor when I glue it to the sewer pipe. Any suggestions on how to fix this or will my idea work.
Tilting, bending or otherwise trying to install a closet flange any way but level is going to cause you problems for a long time. I would be looking for a way to move the flange out the 1/2" or ordering a 10" rough toilet (if you now are installing a 12" rough toilet).
If you have never made a mistake, you haven't done much.