Landscapes - Spring 2015 - 56

OPINION

3

4

Because the two technologies address different aspects of
environmental performance, each industry typically considers the
other a rival in the marketplace, which also has an influence on the
way designers and engineers conceive their options for building
envelope solutions.
These examples are by no means intended to suggest that green
technologies are impractical or invalid; quite the contrary. Rather,
I raise these examples to suggest that greater rigor is essential in
the analysis of environmental performance and life cycle impacts.
In the case of green roofs, it is important to acknowledge that
not all products are created equal; different configurations result
in a range of qualities. It is also essential to clearly distinguish
and prioritize performance objectives according to regional
concerns, specifically with respect to climate, ecology and urban
infrastructure conditions.
PERFORMANCE METRICS
The Green Roof Innovation Testing Laboratory (GRIT Lab) at the
university of Toronto is dedicated to analyzing and evaluating
green building technologies. The research lab was initiated in
response to the uncertainties described above, and importantly,
as an extension of the Centre for Landscape Research (CLR)
at the John H. Daniels Faculty of Architecture, Landscape, and
Design. CLR's long-standing pursuit of performance metrics, the
exploration of new technologies and digital software, and applied
research collaborations provided the framework and credibility to
invite a range of academic, industrial and government partners
to collaborate. What sets the GRIT Lab apart from previous
quantitative research projects at CLR is its physical testing
facility on the rooftop of the Daniels Faculty and the use of sensor
technology to acquire real time data.
The impetus for the green roof research was Toronto's adoption
of the Green Roof Bylaw in 2009. Given the lack of testing of
the City's green roof construction standard, the GRIT Lab has
undertaken a five-year-long study to examine the performance
of green roofs, with a specific focus on stormwater management,
56 LANDSCAPES PAYSAGES

thermal cooling and the provision of value habitat for a diversity of
pollinators. We examine two different growing media types and
depths, two different planting treatments, and three different
irrigation schedules. In order to determine the most significant
parameters for runoff reduction and thermal cooling, we employ
a series of sensors - a rain gauge that measures effluent flow
rate, a soil moisture sensor, and five temperature sensors. Data
is recorded in five-minute intervals and analyzed in relation to a
weather station located onsite, which records solar radiation, wind
speed and direction, relative humidity and precipitation.
In parallel, the lab also studies green façades - three-dimensional
metal screens and tensile cables that facilitate the growth of vining
plants - for the thermal cooling potential of building envelopes. We
compare the growth rate and pattern of different vine species over
the growing season against a non-vegetated wall. Temperature
data is acquired through wall-mounted temperature sensors
and then compared to the data acquired by the weather station.
The third area of research focuses on the integration of solar
photovoltaics (PV) and green roofs. We are testing the hypothesis
that green roofs will reduce local air temperature through
evapotranspiration and solar reflectance in order to optimize
the performance of the PV and extend their lifetime. In addition
to the rain gauge and temperature sensors, this installation
also includes wind sensors, solar radiation sensors and energy
monitoring equipment.
To address the complexity of these technologies, a collaborative
and interdisciplinary research is imperative. The research group
includes faculty and students (PhD, MSc, MEng, MLA, MArch,
undergraduate) from the Landscape and Architecture programs
at the Daniels faculty, from the Civil and Mechanical Engineering
Departments at the university of Toronto, and from the Biology
Department at York university. The lab also collaborates with
over a dozen industry members (including roofing, green roof,
green façade, irrigation, solar, building science and construction
companies), as well as with the City of Toronto - Environment and
Energy Division.



Landscapes - Spring 2015

Table of Contents for the Digital Edition of Landscapes - Spring 2015

To Being With | Pour Commencer
The New Small | Le Microcosme Réinventé
Paula Meijerink, Guest Editor | Rédactrice invitée
EN_LP+ | Small Matters: Backgrounder
FR_LP+ | Prodigieuse Petitesse
Writers | Collaboratuers
Je Vois Montreal
Upfront | Prologue
Forêt urbaine
Urban Braille
Find Your Pebble
Folly Forest
Parklet Experiment
Klynstra Scholarship
Prix 2014 Schwabenbauer
The Common Sense Curb Cut
Essay | Essai
Doggy Style
Projects in Place: The LA Flash Mob
Tiny Taxonomy
Lying Down in Public
Kelowna asks, "What if,,"
A Non-Urban Approach X3
New Directions | Nouvelles Avenues
Opinion
Critique
The Last Word | Le Mot de la Fin
Landscapes - Spring 2015 - cover1
Landscapes - Spring 2015 - cover2
Landscapes - Spring 2015 - 3
Landscapes - Spring 2015 - 4
Landscapes - Spring 2015 - 5
Landscapes - Spring 2015 - 6
Landscapes - Spring 2015 - 7
Landscapes - Spring 2015 - FR_LP+ | Prodigieuse Petitesse
Landscapes - Spring 2015 - 9
Landscapes - Spring 2015 - Writers | Collaboratuers
Landscapes - Spring 2015 - Je Vois Montreal
Landscapes - Spring 2015 - The Common Sense Curb Cut
Landscapes - Spring 2015 - 13
Landscapes - Spring 2015 - 14
Landscapes - Spring 2015 - 15
Landscapes - Spring 2015 - 16
Landscapes - Spring 2015 - 17
Landscapes - Spring 2015 - 18
Landscapes - Spring 2015 - 19
Landscapes - Spring 2015 - Essay | Essai
Landscapes - Spring 2015 - 21
Landscapes - Spring 2015 - 22
Landscapes - Spring 2015 - 23
Landscapes - Spring 2015 - Doggy Style
Landscapes - Spring 2015 - 25
Landscapes - Spring 2015 - 26
Landscapes - Spring 2015 - 27
Landscapes - Spring 2015 - 28
Landscapes - Spring 2015 - 29
Landscapes - Spring 2015 - Projects in Place: The LA Flash Mob
Landscapes - Spring 2015 - 31
Landscapes - Spring 2015 - Tiny Taxonomy
Landscapes - Spring 2015 - 33
Landscapes - Spring 2015 - 34
Landscapes - Spring 2015 - 35
Landscapes - Spring 2015 - 36
Landscapes - Spring 2015 - 37
Landscapes - Spring 2015 - 38
Landscapes - Spring 2015 - Lying Down in Public
Landscapes - Spring 2015 - 40
Landscapes - Spring 2015 - 41
Landscapes - Spring 2015 - Kelowna asks, "What if,,"
Landscapes - Spring 2015 - 43
Landscapes - Spring 2015 - 44
Landscapes - Spring 2015 - 45
Landscapes - Spring 2015 - A Non-Urban Approach X3
Landscapes - Spring 2015 - 47
Landscapes - Spring 2015 - 48
Landscapes - Spring 2015 - 49
Landscapes - Spring 2015 - New Directions | Nouvelles Avenues
Landscapes - Spring 2015 - 51
Landscapes - Spring 2015 - 52
Landscapes - Spring 2015 - 53
Landscapes - Spring 2015 - Opinion
Landscapes - Spring 2015 - 55
Landscapes - Spring 2015 - 56
Landscapes - Spring 2015 - 57
Landscapes - Spring 2015 - Critique
Landscapes - Spring 2015 - 59
Landscapes - Spring 2015 - 60
Landscapes - Spring 2015 - 61
Landscapes - Spring 2015 - 62
Landscapes - Spring 2015 - 63
Landscapes - Spring 2015 - 64
Landscapes - Spring 2015 - 65
Landscapes - Spring 2015 - The Last Word | Le Mot de la Fin
Landscapes - Spring 2015 - cover3
Landscapes - Spring 2015 - cover4
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