On July 17, 2008 California became the first state in the nation to adopt a set of “green” building codes. http://www.bsc.ca.gov/prpsd_stds/default.htm. The code was drafted by the California Building Standards Commission as a result of governor Arnold Schwarzenegger’s directive to the Commission on October 14, 2007 vetoing AB1058. The governor opined that it was “imperative to expedite the greening of California’s building standards” and stated that green standards should be incorporated into the 2010 building code. After extensive meetings between policymakers, industry insiders and environmentalists, the current set of standards were agreed upon and will first be introduced as voluntary in the upcoming January 2009 version of Title 24, the California Building Code. The Commission claims a voluntary introduction will make the transition easier on builders as they can gradually incorporate the measures into their practice over the next couple of years before they actually become mandatory and because they will not effect projects currently under construction. The state agencies adopting sections of the voluntary code include the Building Standards Commission (BSC), California Department of Housing and Community Development (HDC), Division of the State Architect (DSA), and the Office of Statewide Health Planning and Development (OSHPD). If a project is under the jurisdiction of one of the above mentioned agencies, a builder must determine what sections of the codes the agency has adopted by using the checklist supplied in chapter 11 of the code.
The code’s self-proclaimed purpose is to “improve public health, safety and general welfare by enhancing the design and construction of buildings through the use of building concepts having a positive environmental impact and encouraging sustainable construction practices.” Sustainability measures in the following five categories are discussed in detail: planning and design, energy efficiency, water efficiency and conservation, material conservation and resource efficiency, and environmental air quality. According to the code, a green building should achieve more than a 15% reduction in energy usage from the state’s already mandatory energy efficiency standards. Some of the energy reducing techniques the code specifically mentions include the installation of Energy Star appliances, HVAC systems that include demand response software, use of landscaping for thermal loss protection and maximum shading, installation of sufficiently sealed building joints and openings, orienting buildings to provide maximum exterior shade for south facing windows, and proper training of building maintenance staff. Also included is the incorporation of on-site renewable energy such as the use of solar, wind, or geothermal sources to power the building’s energy needs. Water efficiency and conservation measures mentioned include installation of plumbing that meets a 20% reduced flow rate, as well as installation of graywater irrigation or rainwater collection system. Further measures include the use of recycled, bio-based and regional materials, certified wood products and materials with a long service and reduced maintenance life. Lastly, to build a structure with positive environmental air quality, the code suggests the use of low VOC paints, sealants and adhesives, along with the use of proper ventilation.
Although the code is currently voluntary, the Commission chair stated that she hopes builders, cities, and towns will act on their own to exceed these measures. If California is to meet the stringent emission reduction standard set out under AB32, the Global Warming Solutions Act (a 30% reduction by 2020) changes in the building code are essential. Studies have shown that buildings are responsible for 30%-40% of the emissions produced in the US, and they consume up to 70% of electricity generated. Accordingly, some environmental groups see the voluntary codes as a weak solution to this pressing issue. See the Sierra Club comments at http://sierraclubca.blogspot.com/2008/05/weak-green-building-rules-make-bad.html. Many cities throughout California, including San Francisco, San Jose, San Diego and Los Angeles, however, have already acted to incorporate green building measures into their respective building codes. For example, starting in 2009 San Francisco will require all new small scale residential construction to achieve a total of 25 points under the GreenPoint rating system, and by 2010 it will require all high rise residential projects and commercial buildings over 75 feet in height to achieve LEED silver certification. The question remains weather builders in other California cities and towns will utilize the voluntary standards before they are required. Some builders are already taking the code seriously and suggest industry insiders need to get up to speed on the new codes as soon as possible, and most industry groups such as the AIA and the US Green Building Counsel applaud California’s forward looking initiative.
Link to USGBC Counsel Comments: http://www.acppubs.com/article/CA6579525.html?q=California+Voluntary+Green+building+codes;
Link to AIA: http://www.aia.org/aiarchitect/thisweek08/0725/0725n_code.cfm.
The California Green Building Blog will follow the contractors and towns that choose to implement and require additional green building standards, and any further changes to the building codes to incorporate green measures, so please check back with us frequently in order to stay on top of this exciting emerging issue!