Green Roofs - Living Architecture Monitor - Summer 2019 - 17

Images Courtesy City of Minneapolis

THE
TEAM
 

SIKA SARNAFIL: ROOFING MEMBRANE - 80 mil-PVC waterproofing
membrane -  Sarnafil G476 Waterproofing Membrane
IRRIGATION: Below Flow Flat Dripeline Tubing, KISSS, kisssusa.
com, 24" apart. An Electro Field Vector Mapping (EFVM) system was
installed to accurately locate a leak, should one occur.
ARCHITECT: Leo A Daly
ROOF CONSULTANT: Inspec
LANDSCAPE ARCHITECT: Kestrel Design Group
CLIENT/OWNER: City of Minneapolis, Community Planning and
Economic Development
GENERAL CONTRACTOR: Tecta America Co 
MAINTENANCE: AD Greenroof LLC

of disturbance, the vegetation has recovered surprisingly quickly.
 Partridge pea, a native plant, is very aggressive on this
green roof, as well as other local green roofs. Mowing it before
it goes to seed allows the other species planted on this roof to
co-exist with the partridge pea.
We've learned that native plants can thrive on green roofs
with a very thin growing media profile and minimal irrigation.
Green roof technology has made it possible to provide high
quality pollinator habitat - a 2.5 acre community of diverse
native prairie species - in a dense urban area of downtown
Minneapolis, where at grade open space is limited, on a building with limited structural capacity.
We are tracking irrigation water usage and collecting
data on growing media temperature and moisture content. A
vegetation inventory is also performed twice a year. Except
for during the drastic disturbance during the 2017 building
renovations, the green roof has consistently met performance
requirements, which are:
* Minimum 95 per cent cover of installed species
* Minimum diversity of 6 species; minimum of 4 of these must
have at least 10% cover
* No areas greater than 2 sf bare of planted species
LIVINGARCHITECTUREMONITOR.COM

* Control weeds as necessary at maintenance visits and whenever patches greater than 4 sf of species not part of the plant
list develop in between weeding visits or if any weeds are
flowering in between weeding visits
An analysis of the costs and benefits of the green roof conducted by Kandiyo Consulting in 2011 found that energy
savings and stormwater utility fee savings of $226,000 in the
first year. The City has stormwater utility fees for which green
roofs provide a 100 per cent exemption. Combined with the
elimination of future roof replacement costs, this has resulted
in a simple payback of 5.2 years on the incremental cost of the
green roof, which was $2.4 million.
The City expects to save more than $8 million in operating
costs over the next 20 years and beyond due to its investment.
The green roof has been a major success. Minneapolis has gone
on to implement more green roofs on its facilities, including its
historic City Hall Building.
Casper T. Hill is the media relations coordinator for the City of Minneapolis, the location of the Grey to Green Conference on September 30,
2019. See www.greytogreenconference.org
LIVING ARCHITECTURE MONITOR / SUMMER 2019 / 17


http://www.greytogreenconference.org http://www.LIVINGARCHITECTUREMONITOR.COM

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
Green Roofs - Living Architecture Monitor - Summer 2019 - 7
Green Roofs - Living Architecture Monitor - Summer 2019 - 8
Green Roofs - Living Architecture Monitor - Summer 2019 - 9
Green Roofs - Living Architecture Monitor - Summer 2019 - 10
Green Roofs - Living Architecture Monitor - Summer 2019 - 11
Green Roofs - Living Architecture Monitor - Summer 2019 - 12
Green Roofs - Living Architecture Monitor - Summer 2019 - 13
Green Roofs - Living Architecture Monitor - Summer 2019 - 14
Green Roofs - Living Architecture Monitor - Summer 2019 - 15
Green Roofs - Living Architecture Monitor - Summer 2019 - 16
Green Roofs - Living Architecture Monitor - Summer 2019 - 17
Green Roofs - Living Architecture Monitor - Summer 2019 - 18
Green Roofs - Living Architecture Monitor - Summer 2019 - 19
Green Roofs - Living Architecture Monitor - Summer 2019 - 20
Green Roofs - Living Architecture Monitor - Summer 2019 - 21
Green Roofs - Living Architecture Monitor - Summer 2019 - 22
Green Roofs - Living Architecture Monitor - Summer 2019 - 23
Green Roofs - Living Architecture Monitor - Summer 2019 - 24
Green Roofs - Living Architecture Monitor - Summer 2019 - 25
Green Roofs - Living Architecture Monitor - Summer 2019 - 26
Green Roofs - Living Architecture Monitor - Summer 2019 - 27
Green Roofs - Living Architecture Monitor - Summer 2019 - 28
Green Roofs - Living Architecture Monitor - Summer 2019 - 29
Green Roofs - Living Architecture Monitor - Summer 2019 - 30
Green Roofs - Living Architecture Monitor - Summer 2019 - 31
Green Roofs - Living Architecture Monitor - Summer 2019 - 32
Green Roofs - Living Architecture Monitor - Summer 2019 - 33
Green Roofs - Living Architecture Monitor - Summer 2019 - 34
Green Roofs - Living Architecture Monitor - Summer 2019 - 35
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
https://www.nxtbookmedia.com