Overview: The crew insulates the exterior wall of the kids' bath with blown cellulose. Tom Silva shows us a paint-on bathtub protector that peels off after construction is complete. We meet roofer James Shea, who has three options, with prices, for the repair of the slate roof. Since the roof can be seen on the street, the Historical Commission will need to approve one of the options: slate repair, replacement of rear hip with fibberglass shingles or replacement with artificial slate. Then we're off to Frankfurt, Germany to visit ISH, the world's largest plumbing and heating exposition. Back in the bath, the crew puts up drywall, using a quick-setting joint compound.