Boise’s Standard in Modern Design.
Compared to an average building of the same size, the Banner Bank Building uses 50 percent less energy, 65 percent less domestic potable water, and up to 80 percent less potable for sewage conveyance. In addition, the building itself is made from 42 percent recycled content materials, diverted over 90 percent of construction/demolition debris from the landfill, and was built at the average cost of competing commercial office buildings. Because of all this, the Banner Bank Building is LEED (Leadership in Energy & Environmental Design) Core and Shell Platinum Rated (2006), which is the highest LEED rating for commercial buildings.
The building’s occupants, and the owner, benefit from the flexible underfloor air and power delivery system, demountable walls and doors, and lighting controls for each fixture. The long spans resulting from the building’s unusual castellated steel beam structure eliminates all interior columns, thus reducing space requirements and making tenant reconfigurations easier. In addition, the integrated interior wall, floor, power/telecomm and lighting systems make tenant construction quiet, dust-free and 70 percent faster than standard drywall construction.
The project was made with as few parts as possible that not only “snap” together, but can be re-used and/or recycled at the end of the building’s useful life. Custom designed white pre-cast concrete panels, coupled with multi-hued fenestration, deliver a building envelope that is richly detailed, durable and stately. Translucent canopies diffuse direct sunlight as well as reflect it toward the ceiling of the ground-floor anchor tenant (Banner Bank).
Indoor Air Quality
Banner Bank Building meets all “expected” green IEQ protocol (low/zero-VOC finishes, smoking policy, etc.), while a quiet, low-velocity underfloor air distribution system delivers fresh air at an exchange rate exceeding 0.9 (as defined by ASHRAE Standard 129-1997). Individual thermostats in perimeter offices regulate individual geothermal-powered reheat and VF fans.
This project exceeds ASHRAE 90.1-1999 by over 50 percent. Contributing to this energy efficiency are lighting controls that achieve a 63 percent reduction in electricity, underfloor air and power distribution, a closed-loop water pre-chiller, and individual air handlers on each floor. The entire building is heated with geothermal hot water, which is injected back into the aquifer.
Banner Bank Building’s water strategies have caught national attention. Water use is reduced by 0.5 gpf urinals, 0.5 gpm lavatories with timers and sensor activation, and a closed-loop water pre-chiller. The Banner Bank Building also harvests stormwater from over seven acres of off-site public right-of-way streets and sidewalks. In addition, all lavatory graywater is captured. Both sources are stored on-site, treated for clarity and purity, and used to flush every toilet and urinal in the building plus provide all irrigation water.
Materials & Resources
Besides surpassing most of the standard LEED materials criteria (recycled content, local regional materials, and construction waste management) Banner Bank Building pushes the envelope at reducing environmental impact via reusing building materials. The raised floor system, power/telecommunication boxes, demountable walls and door, and even lighting fixtures and controls call all be re-used for decades, thus reducing environmental impacts for the life of the building.
Information submitted by HDR Architecture, Inc.
Banner Bank Building Awards