Drain pipes for shepherd hut

[Jonny123]

Hi everyone, I have embarked on the journey of building my own shepherd hut, and am now at the stage of sorting the plumbing out. I've never done plumbing before so after lots of online research I've put together a plan of how I'm going to tackle the waste pipes. These pipes will be standard white 32mm solvent cement sealed pipes going into a 110mm black soil pipe that will run under the hut and eventually into the ground and along to a sewerage treatment plant.

 

I would really appreciate advice on the design, and if it would work for my hut, or if there is a better way of doing it. A few questions I have are:

 

• Should I use a plastic vent on top of the soil stack or an Air admittance valve (AAV)

• Do I need vents for the sinks and shower?

• Should I put 90° bends in place that have access hatches in case of blockages

• Any ideas on how I can get a 1cm in 40cm fall under the hut, I was thinking of bolting wood to the steel Chasis with the required fall, and then screwing 110mm soil pipe clips to that.

• I have added the soil stack to the opposite side of the en-suite to the toilet because the shower side is the back of the hut and I don't want the soil stack at the front. will this still work?

 

Any advice really appreciated 🙂
 

Edited April 13, 2022 by Jonny123
forgot to add the drain plan JPG

[Russell griffiths]

Haven’t got time to think about your whole question. 

But you need to ditch the 32mm idea and go 40mm if any length of run then go 50mm 

32 is only any good for a tiny wash basin over a tiny distance. 

[Russell griffiths]

I don’t like your layout at all. 

I would take the toilet directly to the out let for the septic tank. 

I would have a stack coming out of the ground rising to take the toilet, with a 50mm entry point going back to shower and sink, with a separate 50/40 to the kitchen sink. 

[Russell griffiths]

without spending more than a minute  on it something like this.  

[Jonny123]

Thank you 👍🙂