Three weeks into the new house raising in Weston, Massachusetts, and the building envelope is almost complete. The Bensonwood crew places the last of the roof panels and sets the five-thousand pound cupola to cap off the house. The roof panels are made in the Bensonwood workshop from over fifty different structural insulated panels while crews work to apply shingles and a standing seam copper roof to the cupola before it flies. An important part of the energy efficient story with the Weston project is the new windows. General contractor Tom Silva shows host Kevin O'Connor how the windows are properly flashed and installed in the Bensonwood workshop in New Hampshire.