Suggestion for tidying up waste pipes

[BMcN]

Hi guys, I am looking for some advice on how to tidy up my pipes.  See attachments 1 and 2.  These show the waste pipes for all upstairs plumbing, however this means a waste pipe running horizontally across the outside, which I would very much like to avoid.

 

a

 

I am wondering if I can run the toilet waste on the room marked Bathroom, to something similar to whats shown in attachment 3.  This would mean a 90 degree bent on the waste run, so  I would need two rodding access points I guess.

 

 

Or can anyone else come up with any tidier solutions?

 

Thanks

[ProDave]

My suggestion is use an internal stack pipe.  Stack pipes up the outside are so last century.

[BMcN]

Roof is on so that will be a challenge now Dave.  

 

Any suggestions on how things could be rejigged to tidy things up?  

[ProDave]

I took roof tiles off and cut a hole int the roof to fit the stove flue long after it was tiles so you can do the same for an internal stack pipe.

 

Which way do the floor joists run on your drawing?  Solid wood or posi joists?

[Gone West]

11 hours ago, BMcN said:

Or can anyone else come up with any tidier solutions?

We retro fitted an internal stack pipe when we renovated an old Victorian cottage. A much neater solution.

[Ed Davies]

1 hour ago, BMcN said:

Roof is on so that will be a challenge now Dave. 

 

Does an internal stack need to go through the roof? Maybe an AAV [¹] at the top of the stack inside (e.g., in the loft) and, if needed, a separate outside vent.

 

[¹] Air admittance valve, not automatic air vent.

[scottishjohn]

25 minutes ago, Ed Davies said:

 

Does an internal stack need to go through the roof? Maybe an AAV [¹] at the top of the stack inside (e.g., in the loft) and, if needed, a separate outside vent.

 

[¹] Air admittance valve, not automatic air vent.

if not  a vented loft --maybe could get  smells ?

can you get an inline AAV and then have a ducted pipe through wall up under gutter  

but  have a "y "piace in loft with cap for rodding ?

[MJNewton]

AAVs admit air; they don't allow it (and smells) out. 

[scottishjohn]

11 minutes ago, MJNewton said:

AAVs admit air; they don't allow it (and smells) out. 

then no problem being in the loft then -unless it not quite sealing correctly

[BMcN]

@ProDave the joists are JJI style and run left to right on the screenshots, at 400 centres.

 

The loft is a cold vented one.  

 

Anyone care to have a sketch of a better solution?  I have no experience with soil waste so would be good to have a decent idea or plan before I approach building control.

[BMcN]

I spoke to someone today who said that there must be an open vent somewhere in the system.

 

With this in mind a vent could be attached to a ridge tile.   I'll have a play around and see what way I can arrange stuff.

[MJNewton]

I'd look into that further if I were you. Our system (an estate build so ought to be regs compliant at least in design) has no open vent; just two AAVs for the two internal soil stacks we have. Perhaps positive presssure is dealt with by the sewer system in our case?

Edited December 4, 2019 by MJNewton

[Ed Davies]

39 minutes ago, BMcN said:

I spoke to someone today who said that there must be an open vent somewhere in the system.

 

Yes, but it doesn't necessarily need to be in the house.