All the major bits have now arrived for the bathroom refurb, so starting to think about the plan of attack for the vent/soil stack ...
This house only has one bathroom/loo, so need to keep the out-of-order time down to a minimum, hence try to plan what parts I need, will probably have a few random useful standby bits on sale-or-return from SF/TS to avoid having to dash out for them if required :-)
A quick overview of the current setup
or, if you prefer the branch is of course 87.5° swept, rather than the lazy 90° shown in my diagram.
Blue vent stack coming down from roof into yellow boss, with cyan connection from basin ... yellow boss goes down into magenta branch/boss with green connection from WC and red connection from bath ... magenta branch goes downstairs into blue soil stack.
The red 40mm connection from bath is solvented into the branch/boss, this was copper trap/tube until I recently noticed it was leaking, so new trap and temporary flexible plastic fitted.
The cyan 32mm connection from basin is still copper push fit into a rubber adapter.
Some photos, excuse 40+ years of crud (no actual shit, honest!)
I'm not over-familiar with soil pipe fittings, but it looks like the vent into the top of the boss is push fit? Is that some sort of locking ring? The boss and WC into the branch are also push fit? And the bottom of the branch is solvented to the top of the soil stack? Seem about right?
The magenta/blue junction is actually below floor level which might make life awkward, For my new layout I need the directions of bath and WC connections reversing, thinking of one of these "floor level" manifolds for the basin and bath
with a normal branch feeding the WC into the top of the manifold, and the vent stack continuing upwards (perhaps reduced from 110mm to 83mm to fit better inside some boxing in, IIRC that's the smallest permitted size?)
Everything seems very "solid" at the moment, can't rotate any of what I think are the push-fit joints, is that just 40 years of stiction, or might they not be push-fit? Any tips for separating it?
The markings on the branch actually say 4" any chance this is imperial and will need some form of adapter to 110mm? the pipe is embossed BS4514
4/100, original manufacturer is OSMA, one part number visible is S116, which seems to be a "snap cap" for the sealing rings, are these likely to come off and free-up things nicely, or disintegrate as soon as I touch them?