| Before you attempt to unblock main
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| | to cut houses off from the main drains;
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| drains, make absolutely certain what
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| | this is no longer done, so they are no
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| system you have and get to know how it
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| | longer fitted. But you may find that you
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| works.
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| | share an interceptor with one or more
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| Two pipe systems are still very common on
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| | neighbouring properties. Interceptors are
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| house built before the second world war.
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| | easily distinguished from ordinary
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| There are two separate waste stacks
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| | inspection chambers by an air inlet
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| running down the outside of the house
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| | terminal nearby.
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| – one for waste water and one
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| | The single stack system is the one now in
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| for soil.
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| | common use. As its name implies, waste
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| The waste pipes from your plumbing
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| | water and soil pipes all connect to the
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| fittings run into the waste stack either
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| | same stack. Until recently the stack had
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| directly or via a hopper head (now
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| | to be inside the house but the rules have
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| obsolete but still very common). Pipes
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| | since been relaxed to allow outside
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| from ground floor fittings often connect
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| | stacks. Ground floor appliances too far
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| to the stack under ground. But if they
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| | away from the stack to connect to it have
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| are far away from the stack they run
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| | their own sub stack or run to a closed
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| instead into a separate gulley
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| | (back inlet) gulley. All underground
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| – a kind of underground U trap.
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| | pipes run in a straight line to a meet at
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| This joins the underground pipe from the
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| | an inspection chamber.
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| waste stack at an inspection chamber,
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| | There are as many variations in drainage
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| covered by a manhole.
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| | as there is in plumbing. Houses with a
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| Soil from the WC always runs to the soil
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| | two pipe system which have been
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| stack direct. The underground pipe from
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| | modernized may also have an internal
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| the stack joins the waste water pipe at
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| | single stack or sub stack. Some larger
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| the inspection chamber. Rainwater may be
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| | houses have the one pipe system in which
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| collected at a gulley to join the waste
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| | a single stack runs on the outside of the
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| water system. It may run from the gulley
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| | building. Some early single stack systems
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| to the inspection chamber via a separate
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| | have additional old style gullies.
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| pipe. It may be dispatched to a separate
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| | There may also be more than one
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| gravel filled pit or soak away. Or, in
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| | inspection chamber: they must be
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| areas where water is in short supply, it
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| | installed where ever pipes join and where
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| may run to a separate storm water drain.
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| | the gradient or direction of the drain
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| From the inspection chamber, the combined
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| | changes.
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| waste and soil water flows towards the
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| | The only way to really be one hundred
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| main drain, normally in the road. Before
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| | percent sure on how your drains are laid
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| it gets there it may well pass through
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| | out is to piece them together on a sketch
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| another chamber – the
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| | plan, using the above information as a
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| interceptor – containing a
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| | guide.
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| large U trap. Interceptors were once used
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