Synopsis

At Cambridge Common, the city's oldest public green and a historic hub of revolutionary fervor, master carpenter Norm Abram and host Kevin O'Connor begin the day's work. Back at the project house, Kevin assists Norm and general contractor Tom Silva with framing the roof above the library – a structure designed with a gentle slope to effectively drain water. Plumbing and heating specialist Richard Trethewey demonstrates a new software program to Kevin, enabling him to design the home's HVAC syste