Bath waste problem

[monika]

Hi all, I am after a bit of advice as I am a complete ignorant on the subject of plumbing and drainage.
Just had a bath fitted, unfortunately the bath waste was directed to the gutter which resulted in an overflow and spillage all over the patio area and extension wall. The existing waste pipe travels from the bathroom under the extension roof and down the gutter but in the past it served a small mobility wet room and the waste flow was not as rapid as from the bath. Remedial suggestion was to drill a hole in external wall to put a new waste pipe with connection to soil stack just under the bathroom window or extend the existing pipe to reach the stack. Just need to mention, the soil stack is a bit far away from existing bath waste pipe and there is a gutter in the way. Are there any pros and cons to these two solutions? Also worth mentioning that the sink waste is going to be connected to the bath waste. Just worried it might cause some problems with unpleasant odours.
I would appreciate any opinions and guidance on the subject. Thank you.

 

[Crinkmeister]

When you say gutter do you mean rainwater gutter?

 

[WHPES]

Sink and bath waste must not be connected together but run separately into stack, or yes, you will get odour problems.

Check building regs / Approved Codes of Practice as all waste pipe standards are detailed there - someone on here will probably know as I can't be bothered to look it up.

 

[monika]

Thanks for your reply and yes, I thought the same. But the bathroom fitter claims he has 20 years experience and fitted sinks this way and allegedly nobody complained of bad odours so far. But as you said it is going to cause problems.

 

[WHPES]

There's two ways of doing the job - the right way or the wrong way.

 

[Whyme]

When you say sink do you mean wash basin (sinks are in kitchens). if its a wash basin the rule of thumb is they should be connected to the size bigger than the biggest ie bath waste 1.5". then both into a final stretch of pipework thats 2"( which in the trade is called a 2 inch float) into the stack. also make sure the bath trap isnt a shallow one if connecting to soil because it can be pulled and you will have smells then. also if any waste is under the floor or inaccessible ask him to use solvent weld rather than push fit..good luck and keep us posted...

 

[monika]

Yes, by sink I mean wash basin, thanks for correcting me. I will keep you posted on the progress.
I heard there is a device stopping water being pulled from the basin trap when the basin waste is connected to bath waste?

 

[WHPES]

I'm afraid there isn't. Some people fit anti siphon traps but this is a bodge up and not always successful.

 

[Mike Jackson]

Use HepVO valves.