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Toilet venting question

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spud

September 15, 2015, 06:38:57 AM
Does anyone have a definitive answer about when toilets need to be vented? I always thought that if drain is in 100mm and laid at 1:60 grade then a toilet only needed venting if it was more than 6 m away from main drain.
I see a lot of houses where drainlayers put junctions on outside walls for AAVs when really the toilet doesn't need them.

Am I wrong?


Linkback: https://www.plumbers.nz/ask-plumbers-trade/43/toilet-venting-question/1917/
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robbo

#1
September 15, 2015, 08:40:58 AM
hi guys, Spud my understanding is that if w.c. is no more that 6mtrs from the terminal vent then no aav is required, cheers
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spud

#2
September 15, 2015, 05:20:49 PM
yeah that's what I thought Robbo, as long as everythings at 1:60 which is about 17mm per meter of fall, which is quite a bit really in my opinion.
The number of times I look at a plan and the architect wants vents on toilets which don't require it makes me laugh. I just read one which wants laundry tub run at 1:30 fall! Why?
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robbo

#3
September 15, 2015, 09:44:49 PM
hi guys, yes Spud 16.666666666mm to be exact. Divide 1000 by the required gradient =answer,cheers
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