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Posted: Sun Aug 01, 2004 8:25 pm
by oliveriles
I have fitted a new toilet under the stairs and run the soil stack through the external wall and tapped into the exisitng soil stack which runs under the path, which then connects into the the main waste pipe.
I'm not sure of the best way to set up an air vent for the toilet (externally - as no space internal).
Where the stack comes out of the wall should I run a 110mm pipe vertically up the wall to just below the gutter line (6 meters) and run a vent on the top of the pipe?
Do I have other options?
Why is the air vent needed?
thanks.
Posted: Mon Aug 02, 2004 9:05 pm
by 84-1093879891
Isn't the existing SVP (Soil Stack) vented? If you've connected to that, I can't see why you need to vent again.
The reason for venting is to minimise the risk of odours from the sewers affecting the residents of the house, and also to balance external air pressure with the air pressure within a sewer system.
Posted: Tue Aug 03, 2004 9:40 am
by oliveriles
Thanks, Just to clarify, The toilet on the 1st floor sits on the right side of the wall and the soil stack runs straight down the wall and into the sewer below ground level. This has a vent at the top of the soil stack.
The new toilet is on the ground floor and is in the middle of the wall. The soil stack goes out through the wall and down into the path, along the path and into an inspection chamber where it taps into the sewer where the 1st floor toilet connects.
I wonder if I should be running a new pipe up the wall with a vent for this toilet in the middle of the wall.
What do you think?
many thanks.
thanks,
Posted: Tue Aug 03, 2004 2:52 pm
by 84-1093879891
So: Bog 2 has it's own soil stack (SVP)? If so, then it must be vented. The SVP doesn't have to be dead straight: it can swan-neck, if necessary, but most go straight because that's what looks neatest.
Posted: Tue Aug 03, 2004 8:30 pm
by ABILITY
Sounds like you are using the term soil stack to describe the soil pipe from new bog to sewer - rather than a stack vertically up the wall.
If I remember correctly think for Building regs, ground floor bogs don't need vented stack so long as drop between pan outlet and sewer connection is less than 1.5m.
Also thought that any new installation of soil waste etc from house should have BC approval - at least to inform them.