I own a 3 flat building in chicago. Roof(flat membrane) was repaired 3 years ago due to a lighting strike. It started leaking again and I had the contractor back out(apparently this was not under warranty). There is a pretty significant sag in an area of the roof. They gave me a work order describing that they would remove the area affected, make repairs, install insulation, base sheet and membrane. Long story short - they went up to the roof and basically just put some plywood and insulation down to shore up a sagging area and installed some membrane over it(2 hours of work). I complained that the work done was not what was described and they said that they decided that what was done was sufficient. My question is - Is this something commonly done? if not, what recourse do i have?
Thank you in advance for your help and I hope you all are having an awesome day!
