Shallow waste trap

[kbuck]

I am installing a free standing bath with a shallow waste trap - this will exit via 40mm pipe and will pick up a basin 1m or so down stream from the bath - both will empty into the waste stack (on one pipe).

I have heard that shallow waste traps should not be directly taken to a stack? how do I get round this - do I install a further p type trap further down the line?

Thanks

 

[ChrisR]

Ho long is run to the soil pipe? Shallows trap is fine if it's shortish. Joining waste pipes can give problems with waste backing up into bath though.

 

[kevplumb]

one of these

bearing in mind what chris just said about joining wastes

 

[ChrisR]

Good idea - had brain fade again .
What may not be obvious is that they stop water backing up into the bath.