Richard Trethewey removes a baseboard heater to prepare for a complete remodeling of his bathroom. Richard returns to help the homeowner install radiant heat. The guys ask "What is it?" Painting expert Jim Clark helps a homeowner prepare his aluminum siding for a brand-new paint job.

Richard examines a viewer's corroded copper pipes and identifies the source of the corrosion: a rusty hot water heater. The guys ask "What is it?" Tom helps a homeowner replace the worn-out weather stripping around his drafty kitchen door.