Williams Engineering Building
   
The Williams Engineering Building greenroof on 9.30.10; Photo Courtesy of Bioroof SystemsProject Name: Williams Engineering Building
Year: 2010
Owner: Williams Engineering
Location: Edmonton, Alberta, Canada
Building Type: Corporate
Type: Extensive, Test/Research
System: Single Source Provider
Size: 7500 sq.ft.
Slope: 1%
Access: Accessible, Private
Submitted by: Bioroof Systems Inc.

Designers/Manufacturers of Record:
Landscape Design: Bioroof Systems Inc.
Green Roof System: Bioroof Systems Inc.
Growing Media: Bio-Mix Eco-Blend by Bioroof Systems Inc.
General Contractor: Bal4 Contracting
Installation: Erscon Canada Inc.
Research Lead: Dr. Leonie Nadeau, Senior Researcher, NAIT (Northern Alberta Institute of Technology)
Research Design: Dr. Nadeau & Students, NAIT's B of T in Tech. Management & Landscape Architectural Tech., H.P. Wagner High School
9.21.10; Photo Courtesy of Bioroof SystemsThe Williams Engineering Building greenroof on 9.21.10; Photo Courtesy of Bioroof SystemsClose-up of flowering meadow on 9.21.10; Photo Courtesy of Bioroof Systems
Williams Engineering is a company that has emphasized sustainability from its start. Overlooking Edmonton’s river valley, its headquarters also boasts a healthy and sustainable green roof system.

Installed in June, 2010, the beautiful rooftop meadow on the Williams Engineering Building is a rare green roof success story in the harsh climate of Northern Alberta. Designed as part of ongoing research through the Northern Alberta Institute of Technology (NAIT), the retrofit project aims to test which plants will be most resilient in Edmonton’s dry and windy rooftop environments.

The retrofit proved especially challenging because of structural limitations of the existing roof. As a result, growth media depths vary across the entire roof, with 3-4” areas in the centre and 6-8” areas along the edges of the roof.
Blowing the Bio-Mix Eco-Blend growing media by Bioroof Systems on 6.23.10; Photo Courtesy of Bioroof SystemsBeginning to grow in on 7.12.10; Photo Courtesy of Bioroof Systems
For the different growth media depths, Bioroof prescribed two colorful native urban meadow mixes. Selected species include golden aster, prairie cinquefoil, blue flax, coreopsis, black-eyed Susans, low golden rod, and various native grasses and fescues. Bioroof’s Eco-System utilized locally sourced ingredients to create their Eco-Blend growth media, in order to ideally suit the plantings and the environment. This high organic blend growth media was necessary to providing essential nutrients and unparalleled water holding capacity for the meadow species to surpass all expectations and flourish in such harsh climatic conditions.

The retrofit also included thirteen 2’ x 8’ research test plots which were designed by NAIT to test growth media at depths of 3” (75 mm), 4” (100 mm), and 6” (150 mm). For the test plots, Dr. Leonie Nadeau, a retired NAIT senior, led a team of students from NAIT’s Technology Management and Landscape Architectural Technology programs, along with a group from H.P. Wagner High School. Students were involved in both research design and investigation. The best performance results were expectedly seen in plants in the deepest growth medium.

The Alberta Real Estate Foundation provided initial funding, while Native Plant Producers Society of Alberta donated 1,500 seedlings that included 17 species of grasses and forbs.

Additional thumbnail photos:

The Williams Engineering Building greenroof on 9.30.10; Photo Courtesy of Bioroof SystemsThe Williams Engineering Building greenroof on 9.21.10; Photo Courtesy of Bioroof Systems8.16.10; Photo Courtesy of Bioroof SystemsThe Williams Engineering Building greenroof on 9.30.10; Photo Courtesy of Bioroof Systems9.21.10; Photo Courtesy of Bioroof Systems
Williams Engineering is located at 10010 100th Street, Edmonton, Alberta, Canada. The Williams Engineering Building was featured in the month of April in The 2014 Greenroofs & Walls of the World™ Calendar. Read Tips for building a green roof in Edmonton by Scott Messenger in the Volume 4, Issue 2 of techlife magazine and Green rooftops take root by Lawrence Herzog in Inside Edmonton, Vol. 28 No. 17, of April 29, 2010.
 
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