Civil Engineering Reference
In-Depth Information
but it is doubtful that this would happen in practice. Bitumen and plastic can be
energy recycled (burned) as long as there is a special filter on the smoke outlet.
Waste material has to be deposited at special dumps.
Layering a turf roof
Flat turf roofs are made of several layers. The top layer has the planting with a
soil layer underneath. Under is a filter layer which prevents heavier earth getting
through, and beneath this is a further layer for draining away excess water. The
waterproofing layer is furthest down and should prevent roots from growing
through and water getting into the structure, which is preferably made of con-
crete. On a sloping roof of over 15° the filter or draining layers are unnecessary,
but otherwise the roof is built up in the same way.
The plant layer
A wide spectrum of plants can be grown on roofs, some of which strengthen the
network of roots and thereby the roof itself. They can stabilize it, retain moisture
Turf
Filter layer
Draining layer
Waterproofing
Roof structure
Figure 15.11: Principles for building up an almost flat roof using turf covering.
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