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Wavin AS+
Technical Manual
Phone. +31(0)38 42 94 951
Downpipes > 22 m
In the case of downpipes measuring more than 22 m in length,
the downpipe offsets and the downpipe coupler should be
connected to the horizontal pipe using bypass pipes.
If the offset is > 2 m, the method of installation shown in
Fig.13 must be used. Otherwise the configuration shown
below in Fig. 15 is applied. In these cases, either an extended
bend or a 250 mm coupler must always be installed.
Multiple offset downpipes
If multiple offset downpipes are required (as in the case of
terraced houses, for example), they must be equipped with
direct or indirect secondary ventilation.
Drainage sources should be connected to horizontal pipes
wherever possible.
Please refer to DIN EN 12056, Part 2, for further information
on waste water drainage systems with secondary ventilation.
Connecting collecting pipes to the downpipe
The rules for the proper hydraulic connection of collecting
pipes to downpipes are established in DIN 1986-10. In the
worst of cases, failure to observe these rules can lead to
so-called inward seepage.
Connection pipes for toilets, bathtubs and showers, and also
bathroom inlets, should therefore be connected to the down-
pipe in such a way that dimension h is ≥ the DN of the con-
necting pipe (where h = the difference in height between the
water level in the sink trap and the bottom of the connecting
pipe at the downpipe branch).
Fig. 15: Downpipe offset > 2 m with bypass pipe, or bypass
pipe for transitioning from a downpipe to a collecting
pipe.
Fig. 16: Correct entry into a downpipe.
Airbend 45º
Min.
2
m
Min. 1.5 m
