E9 | Drill Drivers, Patio Expansion | Ask This Old House

Ask This Old House introduces Tool Lab, a segment dedicated to tool techniques and comparing tool types. In this first Tool Lab, Nathan Gilbert explains how drill drivers work and goes over the options available; Heath Eastman explains why and how to use a voltage tester; Mauro Henrique demonstrates the best paintbrush techniques; Mark McCullough helps a homeowner extend her existing patio.