Fitting a new Boss Connector to a soil stack

[Pritch]

Hi all,
am still training to get my qualifications, but a mate of mine has asked me to do a job for him.
Basically, some time ago he had a new kitchen fitted, but has been unhappy that he gets backup of water through the sink, when the washing machine is emptying.
Had a look for him at the weekend and think the problem is fairly obvious, in that the final outflow pipe - which carries the washing machine, dishwasher, sink - is actually fitted so the flow is UPWARDS....hence everything back up to the lowest point, which is the sink outlet. I am not qualified but even I know water doesn't flow upwards....

Cant get enough lift on the existing pipes to ensure the run is all downhill, so reckon I will have tio fit a new outlet to the soil pipe, much lower, but above floor level.

If this is not right then appreciate any advice, but think this is what I need to do, to ensure all outlets can properly discharge.
If indeed I do need to do this, what is the best option for :-

Capping off the existing hole/pipe.
Drilling a new outlet point just above floor level.
Fitting the Boss Connector (as doesn't look like I can get round the back of the soil pipe, as its tight against the wall), and ensuring sealed.
Do I need a trap before entering into the soil pipe (not one there now) ?

Advice/suggestioons appreciated,
Thanks

Pritch

 

[plumberdarren]

Is there a grated drain nearby or is the soil pipe the only option ?

 

[Pritch]

Thanks Darren,+*
looked at that option, as hoped i could run the outlet through the wall, but there isn't an outside drain, so looks like soil stack is only option.
Cheers

Pritch

 

[turnpin]

any chance of some pics?regards turnpin

 

[dontknowitall]

If you can post a photo up of the existing pipework someone (probably not me! - but you never know!!) will be able to explain what's required. Could be something really simple or perhaps a new trap.

 

[garrywhite]

Hi, doesnt waste go through the wall anyway? Cant you chisel away some brickwork to get boss strap round?

 

[Pritch]

Thanks,
no, the waste doesn't go through the wall but into the soil stack (no idea what it was like before, so I will have to check, but all boxed in with the new units, so not visible).
Suppose yes I could chisel brickwork away, but would rather not, as seems very intrusive option, but if thats what needs doing.

Cheers

 

[Pritch]

Will try & get some pics and post up, but wont be for a few days- thanks for the suggestion though.
Cheers