Green Roofs - Living Architecture Monitor - Spring 2020 - 11
measured, Eksi et al., (2017,
Energy and Buildings 145:174187) reported that although
the sedum roof exhibited
greater extremes, the herbaceous perennial and grasses
roof actually experienced more
heat entering the building (or
less heat leaving the building).
This is an advantage during
the winter months as the
herbaceous roof would save
on heating bills, but not in
the summer when a greater
amount of air conditioning
would be required. The larger
volume of substrate on the
herbaceous roof acted as a heat
sink and continued to transfer
heat into the building during
the evening and early morning
hours during the summer.
C.Y. Jim (2014, Ecological
Engineering 62:1-12) reported
similar results in sub-tropical
Hong Kong where summer
energy consumption (energy
transferred into the building)
was higher for a roof covered
with the herbaceous perennial,
Arachis pintoi, relative to a roof
planted with the succulent,
Sedum mexicanum. Likewise,
Franzaring et al. (2016)
reported that as substrates
warmed during the day, they
often retained this heat to
the point where night time
substrate temperatures were
often higher than ambient
air temperatures. So contrary
to conventional logic that
plants with high transpiration
rates are superior, during
the summer months the sedum often outperforms herbaceous
perennials.
So what's the best plant type to use? For stormwater, a
balance must be found between providing enough water to
maintain plant health and aesthetics while allowing the substrate
to dry out enough to provide maximum stormwater storage capacity. In contrast, evapotransporation is a major determinant in
cooling. If the substrate is dry then there is little or no transpiration or evaporation. As green roof practitioners, the choices we
make in plant selection, substrate depth, and irrigation practices
go a long way in determining how well a green roof performs.
It's not always possible to maximize all desired benefits so the
green roof design should be dictated by the primary purpose of a
particular roof.
Brad Rowe has been conducting green roof research at MSU since
2000. Research topics include plant selection, growing substrates,
carbon sequestration, stormwater runoff, energy conservation, and
roof vegetable production. He was the founding co-chair of the GRHC
Research Committee and received the GRHC Research Award of
Excellence in 2008. Brad also teaches a course on green roofs and walls
at MSU.
http://www.chatfieldgreenroofing.com
Green Roofs - Living Architecture Monitor - Spring 2020
Table of Contents for the Digital Edition of Green Roofs - Living Architecture Monitor - Spring 2020
Table of Contents
Green Roofs - Living Architecture Monitor - Spring 2020 - 1
Green Roofs - Living Architecture Monitor - Spring 2020 - Cover1
Green Roofs - Living Architecture Monitor - Spring 2020 - Cover2
Green Roofs - Living Architecture Monitor - Spring 2020 - TOC
Green Roofs - Living Architecture Monitor - Spring 2020 - A1
Green Roofs - Living Architecture Monitor - Spring 2020 - 1
Green Roofs - Living Architecture Monitor - Spring 2020 - 2
Green Roofs - Living Architecture Monitor - Spring 2020 - Table of Contents
Green Roofs - Living Architecture Monitor - Spring 2020 - 4
Green Roofs - Living Architecture Monitor - Spring 2020 - 5
Green Roofs - Living Architecture Monitor - Spring 2020 - 6
Green Roofs - Living Architecture Monitor - Spring 2020 - 7
Green Roofs - Living Architecture Monitor - Spring 2020 - 8
Green Roofs - Living Architecture Monitor - Spring 2020 - 9
Green Roofs - Living Architecture Monitor - Spring 2020 - 10
Green Roofs - Living Architecture Monitor - Spring 2020 - 11
Green Roofs - Living Architecture Monitor - Spring 2020 - 12
Green Roofs - Living Architecture Monitor - Spring 2020 - 13
Green Roofs - Living Architecture Monitor - Spring 2020 - 14
Green Roofs - Living Architecture Monitor - Spring 2020 - 15
Green Roofs - Living Architecture Monitor - Spring 2020 - 16
Green Roofs - Living Architecture Monitor - Spring 2020 - 17
Green Roofs - Living Architecture Monitor - Spring 2020 - 18
Green Roofs - Living Architecture Monitor - Spring 2020 - 19
Green Roofs - Living Architecture Monitor - Spring 2020 - 20
Green Roofs - Living Architecture Monitor - Spring 2020 - 21
Green Roofs - Living Architecture Monitor - Spring 2020 - 22
Green Roofs - Living Architecture Monitor - Spring 2020 - 23
Green Roofs - Living Architecture Monitor - Spring 2020 - 24
Green Roofs - Living Architecture Monitor - Spring 2020 - 25
Green Roofs - Living Architecture Monitor - Spring 2020 - 26
Green Roofs - Living Architecture Monitor - Spring 2020 - 27
Green Roofs - Living Architecture Monitor - Spring 2020 - 28
Green Roofs - Living Architecture Monitor - Spring 2020 - 29
Green Roofs - Living Architecture Monitor - Spring 2020 - 30
Green Roofs - Living Architecture Monitor - Spring 2020 - 31
Green Roofs - Living Architecture Monitor - Spring 2020 - 32
Green Roofs - Living Architecture Monitor - Spring 2020 - 33
Green Roofs - Living Architecture Monitor - Spring 2020 - 34
Green Roofs - Living Architecture Monitor - Spring 2020 - Cover3
Green Roofs - Living Architecture Monitor - Spring 2020 - Cover4
Green Roofs - Living Architecture Monitor - Spring 2020 - MBR
Green Roofs - Living Architecture Monitor - Spring 2020 - A2
Green Roofs - Living Architecture Monitor - Spring 2020 - A3
Green Roofs - Living Architecture Monitor - Spring 2020 - A4
https://www.nxtbook.com/dawson/greenroofs/lam_2020Winter
https://www.nxtbook.com/dawson/greenroofs/lam_2020Fall
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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