Synopsis

Landscape contractor Roger Cook demonstrates various methods for assessing the grade, or slope, of a landscape to host Kevin O'Connor. Later, in the loft, Cook, O'Connor, general contractor Tom Silva, and plumbing and heating specialist Richard Trethewey ponder the question, "What is it?" Subsequently, Silva and Trethewey illustrate different techniques for discerning hidden elements within a wall. The segment concludes with Trethewey assisting a homeowner in repairing a leaky bathtub.