Host Kevin O'Connor arrives to find work on the exterior progressing in the front, while out back, general contractor Tom Silva uses an acrylic stucco system to make the new basement addition blend in with the poured concrete of the old walkout basement. Inside, Kevin welcomes Chris Kimball of America's Test Kitchen back to the show to see the final layout of our kitchen and to get his opinions on the strengths and weaknesses of the design. Back outside, Kevin finds Tom up on the roof, working to waterproof the valley where the flat roof meets the pitched roof of the new entry addition. Insulation contractor Tony Trigler arrives with crews to install four different kinds of insulation throughout the house for four different applications including, eco-friendly batt insulation, cellulose, and both open cell and closed cell spray foam.