Plot: Landscape contractor Roger Cook shows host Kevin O'Connor how he's installing a pre-fabricated pitched structural foam trench drain at the entrance to the garage. Inside, plumbing and heating expert Richard Trethewey shows Kevin the radiant tubing going down in the master suite, the cast iron waste pipe and PEX water supply lines in the walls of the library, and how the high-velocity mini duct system is saving valuable space on the first floor