Replaced chimney with only a double lined chimney.  Never sealed the chimney properly so it always leaked.  Never put the ring around the chimney inside.  Used spray foam insulation sprayed on the roof to try to seal it which later ignited and most likely caused the fire in my shed which resulted in major damage.  Removed outside sheet metal on shed to apply spray foam and never replaced many of the screws used to hold the sheet metal in place. I found all of the extra screws lying all over on the ground and in my driveway, I had to use a magnet to pick them up so I did not puncture one of my tries.  Never replaced the trim around the door.  Installed door knob on exterior door improperly so that it would not stay shut and really hard to get it to lock because I had to lock it all of the time to keep it shut.  Installed one window nicely but pieced metal all around the other window and made it look horrible.  Charged me for foam insulation on all walls and attic but when some metal was removed to check the foam insulation on a wall I found most places had little to no foam, only bare steel walls. Did not silicone properly around window because it leaked. Demanded payment in full up front in cash only.  Brought 2 to 4 of his little kids on the job and they also did damage.  When confronted he refused to come back to fix or complete anything. I had hired this guy in the past and he had done an ok job so that is why I did pay him up front with cash.