Lawn soil test; identifying water supply pipes

Landscape contractor Roger Cook travels to Oregon to help a homeowner improve her lawn, starting with a simple soil test. In the ASK THIS OLD HOUSE loft, Roger is joined by host Kevin O'Connor, general contractor Tom Silva and plumbing and heating expert Richard Trethewey to answer the question, "What is it?" Richard and Kevin visit a local home center to identify several different types of water supply pipes.