Stub stack

[larold]

Been moving some stuff around in my bathroom which necessitates changing some of the drainage pipes etc and I've been reading up on the building regs to make sure I comply. Am still trying to get used to all the trade terminology as I'm a novice at all this. One thing I keep reading about is a "stub stack". What exactly is this? Is it different to the discharge stack?

 

[kevplumb]

View media item 8354

 

[larold]

erm, thanks. which bit is the stub stack then? the section above floor level?

 

[cudney]

a stub stack is a secondary stack which can be fitted on a system as long as there is a normal discharge stack at the head of the drain. (the stack that goes out through your roof, basically the one furtherest away from the main sewer).

you can only use this on the ground floor as no connections can be made above 2 metres. doc H building regs has a good picture and an overview of it and a diagram too,

download it from: http://www.planningportal.gov.uk/england/professionals/en/4000000000382.html

page 11

hope that helps

 

[larold]

thanks, that helps.
Just one more question - probably a silly one, but I went to buy a waste pipe from a plumbers merchant and he asked me which colour I wanted. I said I dont mind but wondered why it mattered if they all get concealed. Or do different colours mean different things?

 

[seco services]

he don't know where your putting it.

 

[Richard C]

a stub stack is a secondary stack which can be fitted on a system as long as there is a normal discharge stack at the head of the drain. (the stack that goes out through your roof, basically the one furtherest away from the main sewer).

you can only use this on the ground floor as no connections can be made above 2 metres. doc H building regs has a good picture and an overview of it and a diagram too,

There may be a little confusion here; the 2m restriction only applies to UNVENTILLATED stub stacks; if you fit an AAV (as shown by kevplumb) the stub stack can be up to 3 storeys above the drain invert without additional ventilation.

 

[doitall]

An AAV auto air valve/vent lets air out.

An AAAV, auto air admittance valve lets air in.

 

[Richard C]

An AAV auto air valve/vent lets air out.

Have you been Googling definitions then
http://www.google.co.uk/search?hl=e...fHkOCECw&sa=X&oi=glossary_definition&ct=title

In this context AAV stands for Air Admittance Valve & as far as I know, everyone that makes them calls them AAV’s.
http://www.screwfix.com/search.do?f...=P&gclid=CLKK0p_XsZkCFQ5uQgodlx1X6Q&source=aw

http://www.floplast.co.uk/uploads/Air Admittance Valves.pdf
Loads of others

An AAAV, auto air admittance valve lets air in.

an AAAV = Advanced Amphibious Assault Vehicle

 

[doitall]

Terrian (geberit) call then Automatic air admittance valves AAAV, which is the correct name.

An AAV is an automatic air vent.

 

[Richard C]

Terrian (geberit) call then Automatic air admittance valves AAAV, which is the correct name.

Trust the Germans to be different but I also see Polypipe call them AAAV’s;
http://download.polypipe.com/bp/sta...on_guides/soil_vent/air_admittance_valves.pdf
Perhaps you ought to contact all the manufacturers that call them AAV's & tell them they’re using the wrong definition; the list is quiet large

An AAV is an automatic air vent.

That's what the link I posted above says; but you’re the first person I’ve had insist on calling them AAAV’s; probably more correct but best leave it at that as all were probably doing is confusing the poor OP.