Drainage in expanded clay
System with drainage layer in expanded clay or gravel
1- Substrate
2- Sloping screed
(>1 / max. 5%)
3- Sliding layer in
bituminised paper felt (400 gr/sqm)
4- Double layer
waterproofing system, made of:
a) first layer: NOVABOND 4 mm, loose
laid on the horizontal surface and fully bonded on the verticals up to a height
of 15 cm above the level of the soil. Overlaps must be torched respectively 8 cm
at the side and 12 cm at the end.
b) second layer: NOVAR-WS anti-root
membrane, FLL certified, 4 mm thickness, totally bonded by torching on
the first layer and on the verticals.
The membrane must be laid in such way
that the side overlapping areas are positioned in the centre line of the first
layer. Overlaps must be torched respectively 12 cm at the side and 15 cm at the
end.
5- Protective layer
made with 0.2 mm thick polyethylene film or 400 gr/sqm non woven
material.
6- Drainage layer
made of expanded clay or gravel.
7- Filtering layer of
compact non woven 200 gr/sqm material
8- Layer of
soil.
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