Green Roofs - Living Architecture Monitor - Fall 2011 - (Page 31)

SPECS CATEGORY: Extensive Residential PROJECT: Hood Canal, a private residence in Quilcene, Washington, 3,200-square-foot green roof Image courtesy of Patrick Carey/Hadj Design AWARD RECIPIENT: Hadj Design, Brier, Washington (green roof designer) DESIGN TEAM: Architect – Bosworth Hoedemaker Structural Engineering – Swenson, Say, Faget Growing Media – Swanson Bark & Wood Products Roofing Contractor – CRS Overburden Installer – Solterra he Hood Canal project is an outstanding small-scale green roof on a west-facing coastal residence in Quilcene, Washington. Situated on the scenic Quilcene Bay, which leads through the Juan de Fuca Strait to the Pacific, the project is an excellent example of a small-scale project with an even smaller development impact. The design strategy involved two priorities: aesthetically reflecting the pre-development plant environment including grasses (Festuca and Koelaria), and fruits (Fragaria), while minimizing the impact of the development on the local wildlife. These overlapped to the extent that some local species that support the wildlife could work in the shallow media and under green roof microclimatic conditions. Where this was not possible, two different tactics were used. One tactic was to select plants that mimicked the appearance of species that were maladaptive to a roof environment but supportive of a particular target animal species. Another was to support green roof conditions that encouraged species succession, and thus allow evolution over time toward better wildlife and plant species integration. The design principle used was to provide a growing medium (ultimately composed of grey pumice, bio-stable compost and phytonutrients) that was slightly higher in organics and fines than normally called for in roofs of such a depth in hopes of encouraging evolved species development. Selected site species shared guild patterns with species that would not immediately work on the roof, but with soil biology evolution over time it was hoped that intermediate species would develop. Eventually, with the interaction of attracted wildlife and the plant and soil biology dynamics, the desire was to create an “evolutionary pressure” on the installed system. The roof has already become home to a variety of local insects and birds. The lower unplanted roof was given driftwood elements and drain rock on top of drain mat, serving two functions. First, it reduced the uplift damage from the windward edge of the roof by setting the newly planted areas back from the edge and providing heavier ballast at the roof edge. Also, by using drain mat and wind-sun break elements as well as small promontories, this roof element extends the range of environments available to long-term plant development. All of these elements help to fit the Hood Canal project extremely well into its ecological surroundings, and ensures that the quality of the little stormwater that drains from the green roof is essentially the same. D A NATURAL HABITAT IN THE WOODS OF THE PACIFIC NORTHWEST T “THIS IS AN ATTEMPT TO BOTH PROVIDE AND TO MIMIC PLANTS THAT SUPPORT LOCAL WATER AND FOREST FOWL. OUR STRATEGY IS TO EVALUATE BOTH THE LAYOUT AND THE PLANT SELECTIONS FOR FUTURE EXPERIMENTS.” Patrick Carey, GRP, principal, Hadj Design LIVING ARCHITECTURE MONITOR FALL 2011 31

Table of Contents for the Digital Edition of Green Roofs - Living Architecture Monitor - Fall 2011

Green Roofs - Living Architecture Monitor - Fall 2011
Contents
From the Founder
Strata
On the Roof With…
Research
Marketing
Policy: The Game Changer
Policy: Toronto’s Green Roof by-Law
Policy: Energy Code Break-Through
Tools
GRHC: Update
GRHC: Welcome New Members
On Spec

Green Roofs - Living Architecture Monitor - Fall 2011

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