Basement Lightwell Soil Pipe

[Martin252]

Hi Everyone

I am new here but hope someone can offer some guidance! House was built around 1896.

A new basement lightwell is being created with a grill at ground level over the top. I wish to re-route the existing clay soil pipe around the lightwell walls in plastic as it currently runs right through the middle just below ground level. See the attached diagram - the proposed drain route is in red - existing route in green.

Reading other posts it seems that building regulations say that above ground drainage has a maximum length of 6m from WC to stack. Does this limit apply from stack on the way to manhole? The pipe is below ground level but only about 200mm and would be attached to the lightwell wall. The width of the light well is circa 1.5m and the length 5.5m making the length 7m before it would disappear below ground on its way to an existing manhole. So does the 6m apply in this case? If it does Is there anything that can be used to break the 7m that would make it comply with regs.

Any advice appreciated before meeting with building control?

Cheers
Martin

 

[jldplumb]

that distance is fine so long as you retain a sufficient fall. They may want rodding access at a change of direction but probably not if its just a 45.

 

[Martin252]

Thanks Jldplumb. The red line on the pic is what I am trying to get approved so will provide adequate rodding access to keep them happy. Cheers

 

[joni os]

Try to arrange rodding access so you and the cellar don't get covered in rose petals when you open access points.

 

[chris watkins]

FYI the 6M limit is for un-ventilated branch pipes to WC, so long as the head of your drain run is fully ventilated then it is OK.

 

[Martin252]

Thanks Chris.

Joni os thanks for the rose petal picture - will wear my crash helmet!

 

[oz-plumber]

Thanks Chris.

Joni os thanks for the rose petal picture - will wear my crash helmet!

Make sure you get a motorbike helmet with a visor.