Repairing a flat wheelbarrow tire and an aluminum rain gutter; drilling a hoel in ceramic tile; and stopping a leaky T&P valve on the water heater.

In the ASK THIS OLD HOUSE loft, landscape contractor Roger Cook shows host Kevin O'Connor how to repair a flat wheelbarrow tire. He also shows a new type of "flat-free" tire. Then, general contractor Tom Silva assists a homeowner in repairing an aluminum rain gutter. Back in the loft, Kevin and Tom demonstrate a tip sent in from a viewer on how to drill a hole in ceramic tile. Plumbing and heating expert Richard Trethewey stops in with a homeowner to check out a leaking T&P valve on the water heater -   and offers a solution to their problem -   by installing a thermal expansion tank.