Staining a deck; preventing sewage backups

General contractor Tom Silva helps a homeowner clean and stain his mahogany backyard deck. Then Tom, host Kevin O'Connor, plumbing and heating expert Richard Trethewey and landscape contractor Roger Cook ask, "What is it?" Kevin makes a HOUSE call to Chicago to help a homeowner prevent sewage backup in her basement by replacing her flood control system. In the ASK THIS OLD HOUSE loft, Tom and Richard share a viewer tip on how to remove a wood plug from a hole saw.