This Old House (1979) : 23x9

Steve sees the progress on the new addition, including a roof joist system of 1 x 12 LVLs, necessitated by the room's high ceiling height. Inside, Tom and our master carpenter show him how they are stiffening up a bouncy third floor by sistering 1/8"" steel sheets to the floor joists from below. Richard Trethewey checks out a software program that computes heat loss for our building, as well as projecting heating and cooling costs with various insulation, window, and power plant configurations. One remarkable finding: with the current, inefficient heating plant and standard insulation and double-pane windows operating costs for 30 years would be around $220,000; with expanded-foam insulation, low-e windows, and super-high-efficiency heating equipment the cost would be $75,000. Our master carpenter takes viewers to Portland, Oregon, where a couple has turned passion for period-perfect Victorian restorations into a fledgling business. Finally, the first of the new sliding glass glass door