waste going into soil stack (question 2)

[Jennie]

Hi all,
On my current project, there is a kitchen waste pipe running through to the soil stack (next door, in the utility room). We're a bit puzzled as to why it is sticking out 90 degrees from the soil stack.
But anyway, we'd like to have the pipes running flat along the wall to the soil stack.

How could I do this? The soil stack is fixed to the upstairs toilet, and the bottom is in cement, so there's no play in the pipe if I try to cut the boss strap out and stick a new bit of pipe in. If I cut in higher up, and put a new boss strap in, the pipe fall will be affected.

Any ideas anyone?

Jennie

 

[stevetheplumber]

cut 4 foot of the pipe out and rerun it using a boss connector then re cement the joint at the base if its tight you may need to slip couplings on a section of pipe above to get the movement

 

[SafeGasInstall]

Good advise from Steve above , or if not sure ring a plumber to do it as you don't want to start taking boxing out cos there is a leak after when all is done !

 

[Masood]

There's another waste pipe coming in to the soil as well, isn't there? Half hidden behind the piece of plyboard? In which case you need to be sure that the two wastes are not at the same height to prevent cross-flow.

Thinking about it, this may be why one waste has been connected at 90 degrees to the other.

 

[SafeGasInstall]

bang on Massod

i did not see the other one , but they always can connect higher and cup this one

 

[Jennie]

Hiya,

I was wondering about crossflow (hence the 90 degrees), but couldn't remember the minimum distance for facing pipes. Turns out it is 200mm minimum, so that must be it.

The other pipe goes off to a washing machine, so if it was all cut out and re-done that pipe could be higher.

But anyway, I think I'll get a more experienced plumber to help me with it. (I've only just finished my NVQ2 in plumbing, and haven't done anything quite like this before).

Thanks again for your advice,

Jennie

 

[galaxy_plumbing]

Hiya,

I was wondering about crossflow (hence the 90 degrees), but couldn't remember the minimum distance for facing pipes. Turns out it is 200mm minimum, so that must be it.

The other pipe goes off to a washing machine, so if it was all cut out and re-done that pipe could be higher.

But anyway, I think I'll get a more experienced plumber to help me with it. (I've only just finished my NVQ2 in plumbing, and haven't done anything quite like this before).

Thanks again for your advice,

Jennie

How far is the washing machine from the stack?

 

[Jennie]

When the washing machine is back in position, it will be pretty close - less than 1m away.

 

[galaxy_plumbing]

you would probably be ok running sink waste straight to stack, cap old holes and make new one for washing machine too 20 cm above and cap old washing machine hole too. put trap on washing machine waste to stop smell. it may be bit difficult to cap current sink hole.

 

[stevetheplumber]

ive not come across problems with 2 waste pipes opposite each other

 

[SimonG]

It's at 90 degrees because of the wall that used to be there and no access straight in. They turned the pipe at the wall parallel with it, gave themselves a foot or so then through the wall (not there now and into the stack. imho