
Special roofing materials
80 VELUX
5
Grass roofs and the like
Use flashing EDL for installation of VELUX roof windows in grass
roofs and other types of roofing with a thick layer of natural
materials.
In these roof constructions a membrane under the natural material
ensures a tight seal around the installation. The membrane is led
from the roof surface to a built-up platform and up along the sides
of the frame all around the window.
Establish frame within the dimensions shown. The platform must
be level with the natural material. Chamfer the edges of the frame
to reduce the possibilities of the membrane cracking or splitting.
Establish transverse drainage above the frame.
If the membrane consists of two layers, position both layers before
fitting the flashing. Fit the flashing all around the window. Fold
down edges of flashing over the platform at the sides so that the
natural material can cover the edges of the flashing. Position a
humus resistant flashing component over the top flashing section.
Bend the flashing component so that it follows the upper side of
the frame. This flashing component is not supplied by VELUX.
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