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Waste Systems For Showers |
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When choosing a location for your shower tray
and other sanitary fittings, it is important to consider how
the waste-water products will be removed. If you are installing
an enclosure in an existing bathroom, then the necessary pipe-work
will probably already be in close proximity as most homes
have their soil stacks and sanitary pipe-work at one corner
of the house. |
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| However if you are installing a new unit, for
example an en-suite in the bedroom or a separate shower room
in the basement then you need to consider how you will run the
waste pipes, to effectively remove the waste. MATKI Continental
shower tray shown |
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Starting with the shower tray the first component
is the 'waste' it self. The length of the waste depends on how
much depth you have underneath the tray, and which 'trap' you
will be using (see above). |
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The two most common sizes are 1 ½"
or 2 ½" long, with the flange being 2 7/8".
The threaded pipe diameter will need to be 40mm or 1 ¾"
and this can be connected direct on to the trap. |
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Some wastes have a detachable centre section which
enables easy clearing of blockages, and some traps have a specially
designed 'top access waste' which lifts out of the chamber in
the event of a blockage. (note this waste is 2 1/2" long)
The waste is silicon sealed to the tray and tightened down
with the plastic nut provided.
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Waste Traps The next component
is the 'Trap', which connects to the threaded section of the
waste. A trap is designed to create a seal of water in a U
bend; this effectively prevents foul smells and insects crawling
up the drains into your bath or shower-tray. The depth of
seal is the vertical distance from the base of the trap to
the bottom of the horizontal pipe outlet and is usually 75mm
for most domestic applications. Shallow tray traps are available
some as low as 20mm though these tend to be recommended for
the older two-pipe waste systems. Most properties now have
single stack waste pipe and it is recommended that the full
75mm seal is installed, the floor will need to be cut away
to accommodate this. |
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The main problem is the risk of siphonage, i.e.
the water being sucked out of the trap leaving it dry, this
could be caused in a number of ways including evaporation, momentum
or even strands of hair hanging over the trap weir which draws
water out of the trap by CAPILLARY ACTION, thus allowing foul
smells to enter the bathroom.
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An alternative is Hepworths new HepvO valve,
which can be used on virtually any waste system. The key difference
is the innovative 'Hygienic Self Sealing Waste Valve' that
allows waste products through the valve then seals and prevents
anything coming back up. A key advantage is that it does not
use the traditional U bend technology which is prone to blockage
by hair.
 More
detail on the Hepv0 valve
Step
by step installation guide for the Hepv0 valve
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| The final component is the 40mm waste pipe, the
main problem is that they must run with a fall, and the length
of pipe that the regulations allow to the soil stack, is limited
to approximately three meters for a 40mm pipe. |
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A solution for longer runs or situations where
a fall is not practical, e.g. installation in a basement is
to install a macerator-pumping unit.
These can handle a shower and vanity unit on there own or
a complete bathroom and toilet. |
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The sanisplit unit is unique in its field, in
that it has completely internal plumbing and all the pipes,
connections, valves and clips that inevitably spoil the appearance
of a bathroom are concealed, although external pipes can be
fitted if required. The unit is also able to pump both vertically
and horizontally up to 70 meters in length, and will therefore
provide a complete solution to most installation problems. |
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| More
detail on the Hepv0 valve |
| Step
by step installation guide for the Hepv0 valve |
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