General contractor Tom Silva installs new red cedar clapboards on the oldest part of the house using a story pole to match the coursing of a later addition. Then, plumbing and heating expert Richard Trethewey arrives to help remove some existing plumbing that's in the way of the new kitchen. Meanwhile, landscape contractor Roger Cook installs a new horseshoe-shaped asphalt driveway that will later be topped with a rustic finish to make it look like a stone driveway, without the mess or the maintenance. Then, Richard shows host Kevin O'Connor how he's solving a rough plumbing problem by using a wet vent in the downstairs powder room. In the second half of the hour, on ASK THIS OLD HOUSE, Tom helps two homeowners build a railing for their porch. Then Tom, along with Kevin, Roger and Richard, asks, "What is it?" Afterward, Roger and Kevin visit a stoneyard to learn about stone used to build walls.