Page 611 - The City and Guilds Textbook: Plumbing Book 1 for the Level 3 Apprenticeship (9189), Level 2 Technical Certificate (8202) and Level 2 Diploma (6035)

Chapter 9 Sanitation systems

Soil stack connection to the drain

The connection to the drain could be one of several materials depending on the
age of the building and its use. Older properties tend to have salt-glazed
earthenware drains, and public buildings often use cast iron drains. Connection
to these materials is usually by a collar, which is sealed with a sand and cement
mortar joint. Modern houses use either PVCu or HepSleve clay piping. The
jointing methods to these materials are shown below.

PVCu HepSleve Salt-glazed earthenware Cast iron

These two sockets are simple push-fit types. The soil pipe These sockets require jointing with a strong 2:1 ratio sand and
should be chamfered and silicone lubricant applied before cement mortar. They should be left for 24 hours before testing
inserting into the socket. is carried out.

Multi-fit pipe adapters are also available for connecting differing pipe materials
below ground. The drain connection, as we have already seen, is made to a
large-radius bend.
If the soil stack is external (outside the building), an access pipe can be used as
the drain exits the ground. On internal soil stacks, access must be above the
spill-over level of the highest appliance.

Installation requirements of appliances
and systems

Good preparation for the installation of sanitary appliances is essential as it is
probably the most visual of all the installations that we undertake. Customers INDUSTRY TIP
can invest a great deal of money replacing their bathroom suites and it is vital
that we get it right. On new dwellings, the
position of the drain
connections will be marked
VALUES AND BEHAVIOURS on the building plan. On older
buildings, we will have to use
British Standard BS 8000 Part 13 gives essential guidance on the class of
workmanship that is expected of us when installing above-ground sanitation what is already in place, so
careful consideration should
systems and sanitary appliances.
be made as to the method of
jointing we are going to use.
The preparations we make before we install sanitary appliances need very
careful consideration. Good planning includes:
● making sure that the hot and cold pipework has been installed in accordance
with drawings
● making sure that any chases and holes necessary have been prepared

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