Foam roof a 2-for-1 deal?

Option provides insulation bonus, long life

Q: We would appreciate your advice regarding our San Francisco home’s roof.

We have a 1915 Edwardian with a flat tar-and-gravel roof in one of the "sunny" San Francisco neighborhoods. We’ve had the home for a dozen years, and while we don’t know the date of the last roofing job, my husband thinks it’s time to reroof.

I would like some insulation on our top floor — insulation seems an afterthought in the house as a whole — and my husband is thinking of installing tubular skylights called Solar Tubes to bring light into the two north rooms of the house. There is some blown-in insulation — not sure how extensive because the access to the attic is via a small space I can barely poke my head into.