New Extension Drainage

[leevis]

Hi
I am in the process of building a new extension and will be fast approaching the time when i need to sort out the drainage. There already will be a soakaway for the rain water, what i am talking about here is the waste feeds from the utility room (sink and washing machine) and kitchen (sink and dishwasher).

This extension is rather large 6m x 6m and the kitchen wastes and the utility wastes will be on either end of the same wall.

There is a selection of drains that could be tapped into etc.

My question here my plumber wants me to speak to the building inspector people and ask a few questions which i do not really understand.

1. Does it need to go into a tumbler or go straight into the bottom of the manhole. Not too sure what this means.
2. Would they want a sub stack or just a gully. Not too sure what this is either.

Anyone know what these are?

Lee

 

[Hugh Jaleak]

Tumbler or Backdrop is used where a shallow sewer is required to connect to a deep manhole. The incoming flow needs to enter the manhole at the depth of the existing channel, to avoid splashback and build up of detritus. Rather than lay the drain a lot deeper than it needs to be, the pipe is run to the chamber at an appropriate depth, then either just outside, (or inside the chamber if there is enough room), a junction is fitted to direct the flow downwards to the channel, and also provide rodding access back along the drain run.

Wastes from the sinks and other appliances can either discharge into an open gulley, or be connected to a stub stack. Stub stack is basically a short section of 110mm pipework, sticking up above the floor or ground, (can be internal or external, if internal it can be hidden inside a cupboard for aesthetics if required), terminated with either a screw on cap or an air admittance valve (AAV). Wastes then connect directly to this stub stack.

Art was never my strong point, but hopefully gives you the gist.

 

[leevis]

Thats awesome, many thanks