Question, I am roughing out a bathroom in the basement. My drain pipe is 5" below the surface of the concrete. Now, the toilet is going to be 5' from the main drain and with 1/4" inch slope for every foot, I lose 1 1/4". My problem is this only leaves me with about 1" after I put the 90 degree elbow on to the toilet. So, how do I get the toilet flange on?