I've even checked brickwork on houses to guard against weather leaks. I remember a beautiful impressionist gouache ruined because of damp coming through and creating mold, which slowly ate the paper as the weather got warmer. The owners were away. When they got back, the artwork had virtually disappeared. You also make a particular point of your expertise in making referrals.
Referrals are part of the practical advice.
Often people don't know they need the services of, say, a framer until they realize they might need to relocate a painting to a safer spot and perhaps reframe it. We give referrals on the appropriate warehousing facilities for the artwork. One client I knew was going to house his photograph collection in a warehouse used for legal documents, which have entirely different needs. Some people loan out their collections, and, though museums often provide those services, problems arise. Once they've returned your painting to your wall, their responsibility ends.