My flat roof was replaced last year. I walked on my flat roof this year and everything is still holding up. This was one of only two companies which gave me a technically correct estimate for the flat roof replacement. I hired a professional inspector (at my expense) which upset the company. I hired the inspector because the previous flat roof replacement done by a different roofing company (now out of business) was a floppy disaster. This roofing company passed the roof inspection with no issues. My only regret is that the company did no offer upgrades like extra insulation at extra cost. Summary: The company understands flat roofs much better then most (or possibly all) other Ottawa companies.