Civil Engineering Reference
In-Depth Information
Figure 15.13: Battens for holding turf in place on steeper roofs.
resistant to dry periods, the depth of earth need only be 6 cm. On a roof with not
much of a slope or a flat roof it is possible to use a layer of earth without turf for
growing vegetables.
In Berlin around the turn of the century there was a method of covering court-
yards with 20 cm building waste mixed with earth. A whole series of such court-
yards exist in an area called Neu-Köln.
The filter layer
The filter layer, which is necessary on a roof with a slope of less than 15°C, can
be rough sand or sawdust.
The draining layer
The draining layer, needed on a flat roof, can be rough or fine shingle or loose
expanded clay pellets.
The waterproofing layer
This layer is necessary to ensure that excess water runs off the roof. There are dif-
ferent ways of achieving this, but the most common is bituminous or plastic-
based solutions.
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