Bends in soil pipe and maximum length

[AnnaWavell]

Hello,

We have a chalet bungalow and are in the process of moving our bathroom into the middle of the first floor. So the toilet has a longer run before it hits the soil stack.

We have three options but we are unsure if these are possible and want to avoid a macerator at all costs!

Option 1 (our preferred as it looks the nicest) the pipe will have two 90 degree bends with a total pipe length of 7.5 metres.

Option 2 the pipe will have one 90 degree bend and a total pipe length of 6.5 metres

Option 3 move the soil stack...

We would put an AAV on the first bend.

Help as we are confused by maximum lengths and bends as we’ve read conflicting reports and the building regs (document h) talks about 15 metres unventilated and 6 ventilated ?!

Any help is very much appreciated.

Anna

 

[Hugh Jaleak]

Biggest factor is getting an appropriate fall on the run, you need to aim for about 1:40 or about 25mm per metre ideally. If that's achievable then any of your options should work, but keep any run as short as possible, and fit the AAV at the highest point, i.e. just after where the WC connects.

I'd also fit an access bend on the outside where the pipe emerges to turn across to the stack.

 

[Ian H]

Here’s one I did earlier:

 

[AnnaWavell]

Brilliant thank you Hugh Jaleak, both options create the correct fall. We were just unsure about the bends. And will definitely put in access bends. I think we’re going with Option 2 as it actually looks ok when we’ve moved things around. thanks again

 

[AnnaWavell]

Ian H that is horrific, but does have an access point...

 

[Nige F]

Ian H that is horrific, but does have an access point...

Now if that had been done in lead by an old plumber it would have been a work of art

 

[durhamplumber]

Here’s one I did earlier:

View attachment 159566

Please tellme thats supposed to be humourous?

 

[Ian H]

Please tellme thats supposed to be humourous?

What? I found the bits in a skip so it was free.

 

[Hugh Jaleak]

As long as it works....