Finished wallboards; storm-damaged trees

General contractor Tom Silva helps a homeowner prepare his concrete basement walls for finished wallboard. In the ASK THIS OLD HOUSE loft, plumbing and heating expert Richard Trethewey shows host Kevin O'Connor how to tie a few basic knots. Then, Kevin, Tom and Richard, along with landscape contractor Roger Cook, ask, "What is it?" Later, Roger and certified arborist Matt Foti demonstrate how to care for storm-damaged trees.