Frequently Asked Questions

Soil

Key:  Show Answer   Hide Answer Select a different category

I have fitted a Hunter S450 Air Admittance Valve, but when I flush the WC the water in the pan rises before it empties. What can I do?

1. Check that tight 90o bends have not been used instead of swept bends in the soil and vent pipe or at the base of the stack.
2. Check for blockages in the soil or drain pipes.
3. Check that the soil stack is connected to a fully ventilated drainage system

At what intervals should a 110mm pipe be supported?

Hunter brackets in galvanised steel or plastic are to be spaced at 2.0m vertically and 1.0m horizontally as specified in table 10 of BS5572:1994. Socket brackets are to be used as fixed points around expansion sockets, controlling thermal movement. Pipe brackets which allow for thermal movement, are to be used for lateral support.

How can I connect the ground floor sanitary appliances into the drain without using internal or external drain gullies?

A group of ground floor appliances may be connected to the drainage system via a stub stack. A stub stack consists of a short length of 110mm-diameter pipe capped off with an access fitting (S667). Where one or more stub stacks are connected to a drainage system, ventilation must be provided via a soil and vent pipe at the head of the drain. The limiting factors are that the distance from the centre of the pan branch to the drain invert must not exceed 1.5 metres, whilst the highest connection should be within 2.0 metres.

How do I connect waste pipes to Hunter closed bosses?

For more information, click here

How do I connect the ground floor sanitary appliances into the drain without using internal or external drain gullies?

A group of ground floor appliances may be connected to the drainage system via a stub stack. A stub stack consists of a short length of 110mm-diameter pipe capped off with an access fitting (S667). Where one or more stub stacks are connected to a drainage system, ventilation must be provided via a soil and vent pipe at the head of the drain. The limiting factors are that the distance from the centre of the pan branch to the drain invert must not exceed 1.5 metres, whilst the highest connection should be within 2.0 metres.