When roll roofing starts to become brittle, its life can be extended-and small leaks prevented-by sealing the entire roof with black asphalt roof coating.

6. What's under Roofing underlayment or felt paper is almost always called for. Some manufacturers will have very specific layout requirements, especially makers of architectural asphalt shingles.

The house seems to be vented at the roof, with vents at the top along the ridge. Can you give us any suggestions as to what this might be, why there is black mold growing on our roof? G.M. Portage. A.

However, Gaffin said, the low-cost surface improved albedo markedly over typical black, asphalt roofs. "It's the lowest hanging fruit. It's very cheap to do; it's a retro-fit.