Kevin and Richard get a taste of culturally diverse Cambridge by visiting what's known locally as "Japan Town." Norm shows how Tom has matched the exterior trim details and how the clapboards are going on over an underlayment that will let them dry out. Then, up on the roof deck, he lends a hand as Tom creates a staggered shingle pattern on the half walls to match what is on the existing house. Kevin heads to Boston's South End to visit interior designers Andrew Terrat and Dee Elms. Back at the house, Richard and project plumber Abe Bilo add floor warming radiant heat to the first floor from below and a state-of-the-art condensing boiler to fuel both the radiant and the hydro air systems. In the second half of the hour, on ASK THIS OLD HOUSE, Roger works with a fencing contractor to install a vinyl privacy fence. Then, Roger, along with Kevin, Richard, and Tom, asks "What is it?" Afterward, Richard replaces a clogged shower valve.