DIYer - need help with toilet pipe air-valve install

[pc__upf]

Hi,

New to the forum - hoping to get some help here.

I am rerouting my toilet to have the pipe work hidden in the eaves.

Bath/shower/basin waste connects to the toilet drain via Barco Bos.

I need help with the air vent.
- Do I need one for toilet, and another for shower/bath/basin waste?
- Do I need one for each bath, basin and shower?

Where is the best location for the air valve (or valves)?

Many thanks for your help.

 

[chris watkins]

Is the stack vented to outside air or is there another stack on your system that vents?
What is a Barco Bos?
What size is the waste float picking up the bath & shower & how long is the run to the bath?

 

[Rob Foster]

I fink op means a strap on or glue boss to put the 1 1/2 inch waste into the 4 inch. If its inch and quarter ..uck. chking

 

[Chuck]

Four 90-degree bends and no rodding-points? Sewage doesn't run up-hill, and it doesn't like corners much either.

 

[Rob Foster]

Four 90-degree bends and no rodding-points? Sewage doesn't run up-hill, and it doesn't like corners much either.

Yea, Op probably needs a re think, maybe we can help him
off out chking

 

[ShaunCorbs]

Boxing and run to the right off the toilet

 

[Rob Foster]

Boxing and run to the right off the toilet

logical, cheaper and better chking

 

[pc__upf]

Gents, thanks for your replies.

Yes, perhaps not the most logical approach but I'd like to try before giving up. This will make space available that was previously unavailable.

The bos (or boss) connects the 40mm on to the 4 in pipe.

It is not going uphill - there is a drop of about 450mm from toilet outlet to outside stack. Is this sufficient?

The stack can be vented outside, but will it take care of the basin/bath/shower pipe venting?

Adding rodding point to the planning.

 

[Riley]

I would say it will block in no time at all have you contemplated 45° bends

 

[pc__upf]

I have contemplated 45° bends, but they really complicate things. Pipe going in between joists, etc.

For what it's worth, i'm using wide 90° bends (don't know the actual name). Still bad?