[Zeke]

You can likely service the turbine. And there are a plethora of coatings to not only extend the life of a built-up roof, but drop summertime temps. For about a buck fifty for a 5 gal you can 2-coat a 500 sq ft roof. Easy DIY.

Get the pro stuff from the roofing supply. I used something with the number 700 (7xx) in it. It's white and creates a rubber membrane. With some trouble I could find out exactly what I bought at Allied Roofing supply. (ALL Roofing)