Green Roofs - Living Architecture Monitor - Spring 2020 - 17
MEMBRANE DURABILITY ANALYSIS 22 YEAR EXPOSED, PROTECTED AND NEW
GPC curve comparison
properties but do not allow to estimate if the waterproofing layer is
still good, and for how long. The GPC Analysis shows how the SBS
polymeric chains in the bitumen blend have been broken down by
environmental conditions. That said, even if the SBS polymeric
chains are getting smaller, some elastomeric properties of the
material can still be present until a certain point. There is no data
actually in the industry showing a "minimum elastomeric property"
needed to be considered waterproof.
The grey line represents the result of the tests done on a new
SBS modified bitumen. The orange line represents the sample
taken under the green roof and the blue line the sample on the
exposed part of the roof.
We can clearly see that new orange and grey lines follow
similar curves. The firsts waves, starting at around 18 minutes are
what is interesting. It gives us an indication of the degradation of
the polymeric chains. What we can deduct from theses lines, is
that the green roof, offering a protection against thermal differences and intense heat fluctuation, limits the degradation of the
LIVINGARCHITECTUREMONITOR.COM
SBS polymers to the extent that they follow a similar pattern as a
brand new SBS modified bitumen with its intact polymers. The
test suggests that the protected waterproofing appears almost as if
it were new.
The blue line however, and the disappearance of these peaks at
18 minutes, indicates that the polymers were degraded and became
short enough to not be visible anymore with this test, whereas
the sample coming from under the green roof clearly still shows
the presence of long SBS polymeric chains. Let's state again that
the short chains of the polymers do not imply that the 2 ply SBS
is deteriorated and should be changed. It only means that this
product would not be suitable for a new installation and that there
is great variation in the length of the polymeric chain molecules.
And what about the green roof in itself? Well it is in great
condition. The drainage components were still intact, the growing
media showed no signs of compaction or significant loss of organic
content and the root systems had not spread outside of the green
roof area.
LIVING ARCHITECTURE MONITOR / SPRING 2020 / 17
http://www.LIVINGARCHITECTUREMONITOR.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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