Jonathan in London, Ontario

// GOALS: + Improve the appearance of my roof + Reduce or eliminate ice damming // AFTER ROOF INSTALL: + Roof appearance looks good. + Ice Damming is Worse. Ridge Venting Net Free Area, i believe, has gotten worse due to poor ridge vent exhaust area. ISSUES: I think they could have opened up my ridge vent holes better -- the installer didnt cut open the ridge vent hole directly over / straddling the roof ridge but instead had the hole off to one side; another ridge didnt have one long open hole but instead staggered between open and closed; all ridges vent holes stopped at the roof edge at about 36-48" from the end instead of the normal 6". Furthermore the membrane laid overtop the roof -- when they cut it open it still obstructs the underlying hole significantly blocking hot air exhaust. Lastly, they put down strapping to raise the metal sheets above the roof sheathing. This gives them a chance to level things on an imperfect roof. From a distance you could tell a roof ridge was dipping; i had the crew come back to attempt to resolve things. They improved it but not perfect. Overall they did a good job, visually. My big issue is what was done underneath with the ridge vent holes. I believe my attic venting NET FREE AREA (NFA) has gone down after this ridge vent install which would explain the significant increase in ice damming.