Moving soil pipe vent out from building by 50mm

A

alexstephens

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Hi,

We have a vent pipe from our soil pipe running up the outside of our single story house, the pipe is connected just below ground level into a porcelain joint (see picture).

The pipe is purely ventilation as all sewage happens below ground.

We are having the back of the house clad and need the pipe moved out 50mm, ideally i would want the pipe to be:
A) reduced in size from 110mm to whatever the minimum would be
B) any bends to the pipe to be under the ground. 0

If the above cant be done then the minimum is to move the pipe out 50mm somehow, any ideas?

Thanks in anticipation. Alex

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If me, using a grinder, cut the porcelain pipe below the joint. Remove the stack. As you have blocked in the window, your in a position to rerun a new stack having fitted a couple of new bends at the start. The bends would be above ground but this allows you to swing the new stack to fit the wall.
 
Cut the Pipe, (its actually made from salt glazed stoneware), below ground if you prefer, and use 2x 45° bends to adjust to required position. Could reduce to 82mm if preferred, I would be wary of removing it and fitting an Air Admittance Valve, (Durgo), as you may remove the ventilation for the drains, which can cause other issues.... :oops:
 
Any advice to him on how to cut the s.g. stoneware pipe?
 
Thanks for the replies.

So if I understand it correctly i can
Angle grind through the pipe at 90 degrees below ground level.
Attach 2 45 degrees plastic bends so I can then rotate the join to get as close to wall as possible.
Run 110 or 82mm pipe up above gutter level as before.

Great! Thanks. Do I need to glue the plastic bends or do they push fit tight enough?
 
Yes. You'll need a suitable connector to adapt from salt glazed to plastic though, Wickes are one stockist that should have something suitable.

Soil pipework and fittings is usually sold in the push fit variety, but use a suitable medium to lubricate the seals before making a joint. (Chamfer any cut ends before inserting into fittings!) The top section of the existing looks already to be done in plastic, if you use 110mm that should be able to be reused, saving you a few £ if you wanted to. ;)

Tony, if the OP had asked how to cut the salt glazed I would have told him.
 
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