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A
green roof can be categorised
as "intensive", "semi-intensive"
or "extensive". Traditional
roof gardens, which require
a reasonable depth of soil to
grow large plants or conventional
lawns, are labour-intensive,
requiring irrigation, feeding
and other maintenance. An extensive
green roof is designed to be
virtually self-sustaining and
should only require a minimum
of maintenance, perhaps a once-yearly
weeding or an application of
slow-release fertiliser to boost
growth. They can be established
on a very thin layer of "soil"
(most use specially formulated
composts): even a thin layer
of rockwool laid directly onto
a watertight roof can support
a planting of Sedum species
and mosses.
Another
important distinction is between
pitched green roofs and flat
green roofs. Pitched green roofs
are a traditional feature of
many Scandinavian buildings
and they tend to be of a simpler
design than flat green roofs.
This is because the pitch of
the roof reduces the risk of
water penetrating through the
roof structure allowing fewer
waterproofing and drainage layers
to be used
If
you require more information
on flat roof green roofs please
contact
us.
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