Waste pipe options
So I'm trying to figure out the neatest and easiest way to arrange the waste drains from one part of our build from a bathroom and ensuit. I'd like to minimise the IC's in the lower part of the drawing below as they're in a driveway, and like a lot of folk on here I'm not keen of exposed external pipework.
First drawing here BC happy with, but I think would require an additional IC as four inlets coming in on one side?
Two alternative options here, there are probably many more, maybe b
Opinions vary. I believe it needs to be higher than the spillover of the lowest appliance so it doesn't reduce flood resistance of the property.
However some say it must be higher than the spillover for the highest appliance for the same reason! That doesn't make sense to me.
There are also "Type A" AAV that can be installed below the spill over level. Think they are rated for higher back pressures to keep water out in event of a flood.