The designers wanted the environmental features of the project to lend strong architectural expression to the building. Most important in this regard are the siting of the project with regard to solar orientation, the deep overhangs and sunshades, and the abundant sun-protected fenestration that provided natural day-lighting and views. As a result of the building’s siting, architectural design, lighting design and mechanical engineering, this project’s energy performance is 15.2% better than what is mandated by California’s stringent energy efficiency code standard. This qualified the city as the owner to receive a monthly incentive of thousands of dollars from PG & E. The project’s site energy use intensity (calculated using EPA’s Energy Star Target Finder tool) is 55.9 kBtu/Sf.Ft./Yr. Comparing to the national average of 65 kBtu/Sf.Ft./Yr for “Public Assembly – Recreation” use, the percentage of energy reduction is 14%.
The Activity Pavilion is served by four, high efficiency roof top AC units, with air side economizers and CO2 sensors for improved indoor air quality. A modular approach allows selective use of units to match center program needs. Fabric ductwork “socks” (where cheerful yellow/orange complements the interior wood) distributes air with continuous perforated air slots providing a draft free airflow environment. Ductless split systems serve each office and provide control by individual occupants.
Low-emitting materials – paints, coatings, adhesives, and sealants with low VOC, and plywood and fiberboard with no added formaldehyde – minimize indoor air contaminants. The polished concrete slab serves as the finished floor surface, thus reducing material use, and resulting in a floor that is highly durable, easy to maintain, and of VOC-free emissions. A high percentage of fly-ash is specified for the foundation concrete; other material choices with high recycled content include recycled glass countertops and aluminum. The buildings were sited to preserve an existing Magnolia tree grove. The roof has a cool coating to reduce the heat island effect. Bio-swales treat run-off from the patios and ball courts.
