“for shade sail That is true, however when you read the fine print of a warranty they are all virtually the same. I understand op is talking about a metal roof, but in conditions of asphalt the products are the same regarding quality irrespective of supplier with a warranty generally simply cobering up to 20 years. Warranty as well only cover elements, certainly not install. The cert simply gaurantees the merchandise is normally intalled to company specs. Whats even more important may be the roofers do the job warranty. If the roof structure isn't installed correctly regardless of certification it will fail and warranty will be voided. A certification is purchased, no training is done. Thus if the roofer just buys a cert to improve business it will not matter if he follows the cert. Yes they could loose the, but most obtain the cert to improve business, certainly not for just about any added warranty for the home owner. So with regard to warranty a roofers warranty on their work is considerably more important. Just about all roofs mounted incorrectly or with shotty workmanship will are unsuccessful in a calendar year.

Edit: added paet about warranty only covering materials.”