Canadian Roof Masters

Needed the dryer vent reattached after some animal damaged it. After he checked it he said he could repair it for $300.00. He assured me it was done when I paid him. Eventually I was able to gain access to the attic and found that he hadn't even attempted that. He possibly just hammered around the roof I cant tell for sure. I called to question him and suddenly he doesn't understand the issue. He had assured me several times that he had fixed the vent when I paid him but suddenly he doesn't understand what is meant by "dryer vent"