Soil Pipe Boss - limited space?

[DarrenSL]

Hi. I'm installing a washing machine at home and want to plumb the waste into the soil pipe. The soil pipe is boxed in with limited space inside (10cm between pipe and box wall). I need to fit a 90 deg elbow as it won't be possible to boss straight into the pipe due to practically zero space behind plus the need to core through the wall.

All the boss fittings I have seen are either push fit or use a rubber boss adaptor. Are these ok to use in inaccessible area's? Can I just push a solvent weld pipe into this? (a push fit elbow + boss exceeds my 10cm limit). Any other idea's?

Thanks in advance.

 

[KPlumbing]

Use a stand pipe and do it the good old fashioned way leading to the drain outside, if you have no drain out there connect the waste hose to the sink trap. Failing that post a photo.

 

[DarrenSL]

Maybe a diagram would be better. I'm fitting a dishwasher where the washing machine used to be (next to the sink). The washer will be moved across the kitchen where there is no external wall (any other wall is not an option due to the garage and next door property). The external door prevents me from running a pipe outside into the drain so I think my only option is to go into the soil pipe.

View media item 17306
(note: the kitchen is an extension to the original property so the wall between the kitchen and dining room is external)

Let me know if this makes sense. If not I'll post pictures as well.

 

[KPlumbing]

Follow these steps.....http://www.brettmartin.com/building...guide/installation/solventcementjointing.aspx

Still not sure? Post a couple of pics.

EDIT: Is the boxing in the dining room plywood or something similar which you could widen?

 

[DarrenSL]

Yeah I saw that. Looks like I need part BW8 but I don't know where I can buy that (or similar) from. Ideally I would like to assemble the parts I buy in the shop before buying so that I can be sure I'm within the 10cm limit.

Is it advisable to use solvent weld in inaccessible area's? If I use solvent weld does the whole system need to be solvent welded i.e. the standpipe as well?

The 'box' is skimmed plasterboard. I'd only just decorated as well
I really would like to avoid making the box bigger. It would be a huge job (skirting boards, Karndean re-lay, coving, etc) just to fit a washing machine.

 

[KPlumbing]

If you go to a B&Q you can play with the fittings there and I'm sure the resident plumber would be glad to help. Use push-fit for the stand pipe if you like but I'd recommend solvent weld in any inaccessable areas.