the distances from the walls to the drain range from 5'(furthest point)on the west wall to 2'(closest point) on the remaining walls. Going by the 1/4" per foot rule how do I keep the north and south wall corner lines level? If I keep the corner lines level will the pitch be too much where the drain is closest to the walls

That's usually how it works out. If you've got 1/4" per foot going to the furthest wall, you'll have a little steeper slope on the shorter runs in order to keep the perimeter height level all the way around.

That's the reason the drain should be as close to the center as possible.

Also remember to measure from the drain to the corner not the middle of the wall. The corner is usually a good 6" further yet. Also remember the 1/4" per ft. is the recommended min., you could make it 3/8" instead.

Jaz

Good points, Jaz. You should always measure to the furthest corner.

And I always set the pitch for floors at 3/8" per running foot.

Thanks guys, I can now proceed.