Overview: Plumbing and heating expert Richard Trethewey starts the show with a suggestion sent in by a viewer. Richard shows how to use a common wire nut to save a partially-used tube of caulk and demonstrates a new replacement caulk tip. Then, general contractor Tom Silva helps a pair of homeowners replace the worn-out roof on an old garage. Together, they tear off the old roof, lay down felt paper, and re-shingle the roof using new asphalt-fiberglass shingles.