Synopsis

Landscape contractor Roger Cook demonstrates to a homeowner how the brick stairs leading to his house have fostered a fiercely hot "microclimate," harming a nearby shrub. The pair remove the damaged plant and replace it with a heat-resistant yew. Subsequently, Cook joins host Kevin O'Connor, general contractor Tom Silva, and plumbing and heating specialist Richard Trethewey as they pose the question, "What is it?" Following this, Tom improves attic ventilation by installing a solar-powered roof