Bath and Basin waste.

Just a quickie :-)
In my bathroom, the 40mm waste pipe from the bath (enclosed on the floor against a wall) passes the wash basin. The wash basin has it's own 32mm waste pipe and both pipes run (inside the bathroom - no option) together to the point of exit to the soil pipe outside. Would there be anything to stop me simply joining the basin waste to the bath waste pipe by means of a Tee and thus having only one waste pipe for the remaining run to the exit?
TIA.
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Regards,

Troy the Black Lab.
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to
stop
no problem, 40mm t with a reducer on the 32mm entry
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If you do this you will pull a vac on the basin trap and at best it will glug when empting the bath at worst it will empty the trap leaving you with nasty smells. If you really need to do this use a hep'v'o air admittance valve instead of the trap on the basin. Rob
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I did exactly this in my bathroom, I did use an anti-syphon trap from Screwfix on the sink though. No problems so far :)
-- Remove BRAIN before replying

floor
32mm
together
Tee
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I stand corrected, but it seems to be going ok with mine. I have a shower pipe running along and the sink waste falling down into it. That said I do get some glugging (from the shower waste), although hardly any, when I empty the sink. I always put this down to it being a shallow waste on the shower...... but now I know differently I won't do the same again next time........ no honest!
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Thanks to all of you for your help. Job now done but no valve fitted as yet - I intend doing that ASAP - I think Wickes have what I need. Slight gurgling when emptying but nothing serious. It certainly looks a lot neater than having the 2 pipes - the enclosure will be much smaller.
Thanks again.
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Regards,

Troy the Black Lab.
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Troy wrote:

According to the charts on the hepworth web site there are max number of "discharge units" allowed for any particular pipe size at a given drainage slope. a 40mm pipe at 1.25 degree slope can have 2 discharge units a 40mm pipe at 2.5 degree slope can have 8 discharge units.
1.25 degree (minimum) = 22mm/M. 2.5 deg (normal) = 45mm/M
A domestic bath = 7 dicharge units A basin = 1 unit So if the slope is 2.5 degree combining the two is just ok. If the slope is less then no.
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