Drainage - Introduction - Page 1
2 3 
Two-Storey Dwellings
It is good practice to provide a vent for foul water
drains.
Any smells or pressure may be relieved at the
vent.
This may be achieved by continuing the foul water drain to high level above windows in
a building.
In a two-storey dwelling the bathroom is normally upstairs so the foul water drainage system will be partly vertical, as shown below.
The vent
is shown on a gable end, this can also be at the rear of a house or situated internally.
The system shown above is a single pipe system where there is one vertical
soil and vent pipe. In some installations the vents may be connected at each
appliance (wash basin, urinal, etc.). This is shown in the DESIGN POINTS
section.
NOTE: Single pipe and two-pipe
systems are not to be confused with separate and combined systems as discussed
on the previous page.