LABC updates on storm drains
Local Authority Building Control Warranty has updated its advice on storm drain fitting.
It advises: “Principle failures for both foul and storm water drainage are inadequate falls in underground pipework.
“The main issue appears to be with 100mm polythene pipes. For example, Diagram 9 of Approved Document H supporting the England and Wales Building Regulations, indicates that the minimum permissible fall for 100mm pipework is 1:80, provided that there are adequate flow rates above 6.3 litres/second. This would normally be achieved by at least 1 WC on the system.”
It warned: “The introduction of plastic pipe work has inevitably led to a skill set loss of the groundworker. Common indications of likely poorly laid pipework are operatives laying pipes between inspection chamber positions without using a taught line.”
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