 Strong winds on the roof are a
serious threat to the security and well-being of a Green Roof and the people that
use it. However, most roofs have enough intermittent windless periods for people
that want to enjoy an accessible Sky Garden Green Roof. Care must be taken when
installing a lightweight G-SKY Green Roof to ensure that no wind force will be able
to lift plants and soil off the roof. A buildings location and shape affects wind;
making the wind swirl or speed up. This can cause dangerous conditions on a Green Roof and the area surrounding it below.
Protecting a Green Roof from plants flying off the roof and soil eroding will reduce
maintenance costs and protect the building owners from potential insurance liabilities.
Positive Wind Pressure acts directly against tall plants
and trees. If enough pressure is exerted against them,
it could cause them to uproot. For example, when a tree collapses
due to wind, it is because of positive wind pressure.
The root binding strength that a plant can establish on the ground is much greater
than the root binding strength it can establish on a roof. Therefore,
additional supports for vegetation with a greater binding
strength than the positive pressure placed against them must be
installed. For example, a good way to secure trees is by tieing their root balls
to GR Support beneath the soil.
There are several other preventative measures that can be taken to reduce
the force of positive wind pressure, such as wind screens or
other wind barriers. |
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Negative Pressure acts on the roof, leeward and side walls due
to escalating positive pressure from wind on a building.
With enough negative pressure,
soil, plants or the entire Green Roof system could lift
off the roof if it is not secured to the roof. If the
Green Roof is given the opportunity to "scatter", it could fly off the building and cause severe
damage and harm. The Green Roof must be properly adhered to the roof to ensure
that it does not fly off, even when under
extreme pressure. To prevent general scattering drying of soil, a mulch is
placed over loose soil and secured with a garden netting. In the case
of a Amenity Green Roof with trees and shurbs, proper planning to secure the
soil and trees to the roof must be made. |
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Sky Garden Green Roofs need GR Support to be installed to secure the root balls
of trees and shrubs to protect the plants against strong winds. Sky Garden GR-SW
or SWP Green Roof buildups employ GR Tape 20 to prevent a vacuum under GR Drain
20 and the soil.
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The bonding strength of GR Tape 20 is 40000N (4000 kg/m² or 820 lb/ft²). It adheres
to G-SKY Tray 500, G-SKY Drain and GR Drain 20 to withstand wind speeds of 60m/s
(134mph). G-SKY Red Lava Rock Mulch secured with G-SKY Netting over Roof Soil prevents
erosion, scattering and drying while securing plants against wind. |
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