Hello roofing experts. I live on the top floor of a small self-managed building in Brooklyn. We’ve begun to see leaks and water damage, and I’ve volunteered to gather estimates for a new roof. All we know about the history of the building is that it was built in the late 1800’s, and the owner who converted it into co-op apartments did so 30 years ago, and he’s not put a new roof on for at least those 30 years.
So far, I have two estimates and am in the process of getting a third. The estimates are very different, and one also includes the cost of repointing the bricks on the parapet wall, but for now I’d love any and all opinions and advice on the types of materials these companies propose using, and their process. Both companies come highly recommended. The biggest difference in their process is that one recommends putting a new roof over the existing roof, the other recommends tearing off the old roof.
Will uniformly spread a layer of modified bitumen adhesive into which we will embed one layer of smooth, modified bitumen roofing. Each sheet to overlap the preceding sheet by 4 inches and all seams will be firmly sealed.
We will install three new course fabric flashings around the entire parapet walls, base of skylights, vent pipes, and all other objects that come above the roof line, to consist of two layers of asphalt fiber cement and one layer of asphalt saturated fabric to be properly staggered in length and height to secure a water-tight roof.
Where needed we will cover the roof side of parapet walls and chimneys with two layers of asphalt fiber cement and one layer of asphalt saturated fabric. We will cover the roof side and top of parapet walls (with pre-cast stones) with new modified bitumen roofing.
Tear-off old roof. Install a 2" insulation, install a pealing stick bay sheet. Install new SBS cold rubberized roof white colored. Install SBS rubber around the parapet walls, starting from the roof surface going up 12", attaching them with termination bar with concrete nails.
Thanks so much in advance for all of your expert advice!