We have created worksheet links on the PLAN page of the web site addressing most non-rectangular situations. Sometimes the irregularities can get quite complex. We will need enough geometry to replicate the cut. If the irregular cuts can be described easily over the phone, just give us a call. If the irregularities are complex, you can fax us a diagram at 770-645-4746. The best diagrams are simple diagrams. Imagine that you are standing on the interior of your space looking out into your yard. Start drawing your diagram from LEFT to RIGHT sort of like a timeline.