Geosynthetics August/September 2022 - 17

organics as the components of the different
substrates, in addition to being
a material of long useful life, which is
prolonged even more by being covered
without exposure to UV rays and
the outside.
3. Geomembrane sealing
verification process
To ensure the efficiency of the geomembrane
and its installation, the
following airtightness tests need to
be carried out:
¶ By electric charge, capable of
detecting perforations imperceptible
to the human eye
¶ By negative pressure, performed
on extrusion welds
¶ By pressure channel, on thermofusion
welds
4. Placement of drainage system
The drainage system helps ensure the
constant, efficient conduction of water,
either from irrigation or storms, to
rainwater runoff, to avoid stagnation.
5. Fixing system
It is important to perform a mechanical
fixation on the perimeter to ensure
the proper functioning of the waterproofing
system. Otherwise the water
could have access and stagnate under
the waterproofing membrane.
6. Substrate layer
A layer of topsoil, substrate or prepared
soil is placed, according to each of the
species chosen in the plant design.
7. Vegetation layer
It is essential that professionals in the
field determine the vegetable selection,
since it must meet certain characteristics
for better development and
performance according to the objective
of each green roof project and to
guarantee the optimal functioning of
the installed geosynthetics materials.
There are many types of plants that
can damage the geosynthetics, putting
at risk the degree of impermeability
that a job of this type must have, since
water infiltration to the property can
cause serious damage.
8. Maintenance of vegetation
It should not be forgotten that living
beings are being placed on the roofs
and it is mandatory to take care of
them to stay in optimal conditions.
Without proper maintenance, there
could be a saturation of unwanted vegetation
or the extinction of it over time.
Every day we are looking to develop
new alternatives to help fight the climatic
problems that the world is currently facing.
Green rooftops are part of the alternative
solutions, since their appearance
in large cities could bring many benefits,
not only for direct users, but for everyone
if their use becomes widespread.
It is important to have good execution
in this type of project, taking into account
the disadvantages that would develop if
an improper installation is made or the
wrong materials are placed.
Therefore, geosynthetics are the best
elements for a great diversity of civil works
projects, improving the quality of the
infrastructure that humanity demands. G
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17
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FIGURE 6 8,632 square foot
(802 m2) extensive green roof
on a corporate building
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Geosynthetics August/September 2022

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