BPA 905 Building – Rooftop Greening for Energy Efficiency
The green roof development for the Bonneville Power Administration’s 905 Building in Portland is progressing nicely – working with Green Above Ground partners Snyder Roofing and Teufel Landscape under General Contractor Allen-Bradbury Construction from Auburn, Washington. The project is coordinated by the General Services Administration, and is part of energy upgrades as part of the stimulus. The green roof scope include four roof levels that will transform existing terraces into semi-intensive green roof zones.
The transformation from terrace to green roof gave us the opportunity to build up soil areas, adding topography to create microclimates, absorb additional stormwater, and increase habitat. This creates a connected grouping of rooftop berms emulating a stream system.
The mounding and soil depth also allows for increased depth to incorporate native perennials, grasses, and small shrubs to add depth and seasonal variation without compromising the efficiency. The entire roof will be irrigated during seasonal hot/dry periods using captured rainwater, making this roof net zero in terms of potable water use. A rendering of one of the roof levels is found below (click image for larger version).
Construction is underway and will be completed by the end of this summer.
[...] updated photos of the Bonneville Power Administration Building Green Roof, currently in the last stages of construction. Progress has been swift on Levels 5, 6, and 7, [...]
[...] updated photos of the Bonneville Power Administration Building Green Roof, currently in the last stages of construction. Progress has been swift on Levels 5, 6, and 7, with [...]