Green Roofs - Living Architecture Monitor - Summer 2019 - 16

CASE STUDIES

COMMEMORATIVE CASE STUDY:

TARGET CENTER
GREEN ROOF
BY CASPER T. HILL, CITY OF MINNEAPOLIS

As part of the 20th Anniversary of publishing
the Living Architecture Monitor, we are
revisiting iconic green roof projects to see
how they are faring and what lessons can be
learned as they evolve.

T

he awards of excellence winning Target Center green roof
was installed in 2009 above a multi-use arena located in
the heart of downtown Minneapolis. Home of the NBA
Timberwolves basketball franchise, the project is 2.5 acres
(113,000 sf) of extensive green roof, featuring pre-grown sedum
mats planted with 22 species of native plants supplemented with
16 species of native plugs.
Designed by Kestrel Design Group and Leo A. Daly, the design
intention was to manage approximately one million gallons of
stormwater annually and enhance plant diversity and ecological
resilience to reflect the mix of flora found on the dolomite bluffs
overlooking the Mississippi and Minnesota rivers. The use of
Lupines on the roof, for example, is designed to support the
endangered Karner Blue Butterfly.
The Target Center green roof growing media consists of a
2.75 inch deep growing zone in the center of the main arena roof
structure and a deeper 3.5 inch growing zone around the perimeter
where the structural loading capacity is greater. The roof itself is
180' off the ground and inaccessible to visitors to the stadium. Although not open to the general public, several hundred municipal
staff/policy individuals, and green roof professionals from North
America and Europe have been up on and toured the green roof

LIVING ARCHITECTURE MONITOR / SUMMER 2019 / 16

over the years. Nearby hotels
advertise rooms that overlook
this green roof. 
Overall, the green roof at the
Target Center has performed
very well. As expected, some
early successional species, like
Sedum album, have decreased in
number, and later successional
Sedum species have increased in
number.
Partridge pea, also an
early successional species, has
increased greatly in number.
It attracts large numbers of
pollinators to the green roof.
Strawberries have decreased in
number over time, but the few
remaining have very tasty fruit.
By September, the asters
and goldenrods have grown
"hip high" and provide

excellent fall color. Overall,
the roof has a healthy plant
diversity, thanks to a diverse
design and active management
program to prevent aggressive
species from establishing. 
The biggest challenge
encountered over the last ten
years was disturbance due to
construction traffic during
building renovations in the
summer of 2017. Daily construction traffic and equipment
was left on the vegetation for
extended periods of time and
took a toll on the vegetation
allowing weeds to take hold.
With skilled green roof management throughout, as well
as over seeding, soil biology
amendments, and cuttings
installed after a growing season
LIVINGARCHITECTUREMONITOR.COM


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Green Roofs - Living Architecture Monitor - Summer 2019

Table of Contents for the Digital Edition of Green Roofs - Living Architecture Monitor - Summer 2019

Table of Contents
Green Roofs - Living Architecture Monitor - Summer 2019 - IP
Green Roofs - Living Architecture Monitor - Summer 2019 - Cover
Green Roofs - Living Architecture Monitor - Summer 2019 - Cover 2
Green Roofs - Living Architecture Monitor - Summer 2019 - Table of Contents
Green Roofs - Living Architecture Monitor - Summer 2019 - A1
Green Roofs - Living Architecture Monitor - Summer 2019 - 1
Green Roofs - Living Architecture Monitor - Summer 2019 - 2
Green Roofs - Living Architecture Monitor - Summer 2019 - 3
Green Roofs - Living Architecture Monitor - Summer 2019 - 4
Green Roofs - Living Architecture Monitor - Summer 2019 - 5
Green Roofs - Living Architecture Monitor - Summer 2019 - 6
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Green Roofs - Living Architecture Monitor - Summer 2019 - 36
Green Roofs - Living Architecture Monitor - Summer 2019 - M1
Green Roofs - Living Architecture Monitor - Summer 2019 - A2
Green Roofs - Living Architecture Monitor - Summer 2019 - A3
Green Roofs - Living Architecture Monitor - Summer 2019 - A4
Green Roofs - Living Architecture Monitor - Summer 2019 - A5
https://www.nxtbook.com/dawson/greenroofs/lam_2020Summer
https://www.nxtbook.com/dawson/greenroofs/lam_2020Spring
https://www.nxtbook.com/dawson/greenroofs/lam_2019Winter
https://www.nxtbook.com/dawson/greenroofs/lam_2019Fall
https://www.nxtbook.com/dawson/greenroofs/lam_2019Summer
https://www.nxtbook.com/dawson/greenroofs/lam_2019Spring
https://www.nxtbook.com/dawson/greenroofs/lam_2018winter
https://www.nxtbook.com/dawson/greenroofs/lam_2018Fall
https://www.nxtbook.com/dawson/greenroofs/lam_2018summer
https://www.nxtbook.com/dawson/greenroofs/lam_2018spring
https://www.nxtbook.com/dawson/greenroofs/lam_2017winter
https://www.nxtbook.com/dawson/greenroofs/lam_2017fall
https://www.nxtbook.com/dawson/greenroofs/lam_2017summer
https://www.nxtbook.com/dawson/greenroofs/lam_2017Spring
https://www.nxtbook.com/dawson/greenroofs/lam_2016winter
https://www.nxtbook.com/dawson/greenroofs/lam_2016fall
https://www.nxtbook.com/dawson/greenroofs/lam_2016summer
https://www.nxtbook.com/dawson/greenroofs/lam_2016spring
https://www.nxtbook.com/dawson/greenroofs/lam_2015Winter
https://www.nxtbook.com/dawson/greenroofs/lam_2015fall
https://www.nxtbook.com/dawson/greenroofs/lam_2015summer
https://www.nxtbook.com/dawson/greenroofs/lam_2015spring
https://www.nxtbook.com/dawson/greenroofs/lam_2014winter
https://www.nxtbook.com/dawson/greenroofs/lam_2014fall
https://www.nxtbook.com/dawson/greenroofs/lam_2014summer
https://www.nxtbook.com/dawson/greenroofs/lam_2014spring
https://www.nxtbook.com/dawson/greenroofs/lam_2013winter
https://www.nxtbook.com/dawson/greenroofs/lam_2013fall
https://www.nxtbook.com/dawson/greenroofs/lam_2013summer
https://www.nxtbook.com/dawson/greenroofs/lam_2013spring
https://www.nxtbook.com/dawson/greenroofs/lam_2012fall
https://www.nxtbook.com/dawson/greenroofs/lam_2012summer
https://www.nxtbook.com/dawson/greenroofs/lam_2012spring
https://www.nxtbook.com/dawson/greenroofs/lam_2012winter
https://www.nxtbook.com/dawson/greenroofs/lam_2011fall
https://www.nxtbook.com/dawson/greenroofs/lam_2011summer
https://www.nxtbook.com/dawson/greenroofs/lam_2011spring
https://www.nxtbook.com/dawson/greenroofs/lam_2011winter
https://www.nxtbook.com/dawson/greenroofs/lam_2010fall
https://www.nxtbook.com/dawson/greenroofs/lam_2010summer
https://www.nxtbook.com/dawson/greenroofs/lam_2010spring
https://www.nxtbook.com/dawson/greenroofs/lam_2010winter
https://www.nxtbook.com/dawson/greenroofs/lam_2009fall
https://www.nxtbook.com/dawson/greenroofs/lam_2009summer
https://www.nxtbook.com/dawson/greenroofs/lam_2009spring
https://www.nxtbook.com/dawson/greenroofs/lam_2009winter
https://www.nxtbook.com/dawson/greenroofs/lam_2008fall
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