Vent pipe???

[gc100]

Hi,

 

I believe I need a vent pipe of some kind at the highest point of my drainage to let and potential inflamminal gases out? Is this correct?

 

Im basically ready to get the house signed off I think but this is the only item I think that needs doing .

 

What are the building regs is this or can any tell me more or point me In the right direction?

 

Much appreciated 

[Conor]

Yes. You can have air admittance valves on all other stacks but you need one main vented stack. We're having ours go up through the roof from the main bathroom.