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is currently a little harder to get hold of but that other materials should come onto the market as the Code and the industry progress. Mr. Corbett advised that cool roof requirements are already in the energy regulations for the State for residential projects. He added that cool roofs are measured in terms of solar reflectives as well as thermal emittance which indicate how much heat radiates back into the attic. He indicated that cool roofs establish a higher threshold. Commissioner O'Connor inquired if this could also be accomplished by some type of membrane placed between the roof sheeting and the roof itself versus the shingle. Mr. Corbett replied that cool roof requirements refer to the roofing materials themselves and that there are requirements for a radiant barrier underneath the roof. He added that they have been required for commercial buildings for about four years now but have been added in to residential requirements just this past year. Commissioner Blank referred to the costing slide and inquired what causes the variation between $1.67 and $2.14. Mrs. Rondash replied that the variation was due to the different types of products selected. As an example, she pointed out the range of toilet costs from $100 to $250 and up, depending on the type of toilet. Commissioner Blank stated that he with the exception of infill projects, he could not recall a stand -alone single - family home of less than 3,500 square feet in area. He inquired how the 2,100- square -foot number was arrived at. Mrs. Rondash replied that this is the threshold selected in the study prepared for the California Building Industry Association (CBIA). She indicated that homes of other sizes were also reviewed, but this is the size closest to the City's current threshold of 2,000 square feet. Commissioner Blank inquired if a 3,500 -4,000 square foot home would change any of the calculations. Mrs. Rondash replied that this number relates to standard construction measures and applying green measures. She noted that the City's current Green Building Ordinance would apply to a 3,500 - square -foot home in the same way as CALGreen would apply to a 3,500- square -foot home. She added that the City would not anticipate any price change for construction. Mr. Corbett noted that the question of cost came up at the Chamber of Commerce's first meeting with stakeholders, and this was the initial information from the CBIA. He added that staff then reviewed a study done by a consultant in Alameda County who looked at different types of projects, specifically 3,500- and 4,500- square -foot homes in the City's climate zone, and the numbers for the 2,500- square -foot home were fairly comparable. EXCERPT: PLANNING COMMISSION MINUTES, September 29, 2010 Page 5 of 15