I was thinking about paying a company to do a new roof over our business. We have an older building, but it is in really good shape. That is, except the roof. It is a flat rubber roof with gravel over the rubber membrane. It is dry and brittle and leaking like a sieve in places. We put buckets out when it rains. Fortunately it is just a garage where we do repair work. I was thinking of having a wooden roof built over the old roof. I called a place that does commercial roof replacement in NJ. They offered me an alternative.
I was thinking about the longevity of getting a new rubber roof versus putting up trusses, sheathing and shingles. It would be an empty space, but I thought it would last longer. The company that does commercial roof replacement in NJ showed me the new membrane systems they use to replace flat roofs. The technology has come a long way since this old roof was put up there. The gravel surface would be taken away, and the rubber membrane would be removed. The surface structure of metal would be repaired or replaced anywhere there was a problem. The drainage system would be updated, and a new solid membrane would be installed.
The new material they use would become one continuous surface as it was installed. The big sheets of material would be bonded together and even run up the sides of the roof edge. No water would be getting in. The installation looked to be a significant cost savings over building a wooden roof over the flat roof, and the longevity projections were longer than what shingles would last. We decided to have our old flat commercial roof replaced with a new continuous membrane roof surface. It is bright white, and that saves on cooling in the summer.