Connecting sink waste to main drains

[meanpeach]

I'm renovating a Victorian house, I presently have two downstairs sinks (one from the kitchen, one from a downstairs cloakroom), which connect to the main drains via waste pipes that stick out the back wall and drop into two seperate back inlet gullies. I'd like to try and get rid of any visible external pipework, and I was wondering if it is possible to connet these waste outlets directly to the drains without the use of the gullies?

[Tony McC]

It is, but it's a bad move. If owt goes wrong, you have no access to the underground pipework.

[meanpeach]

Hi Tony,

Thanks for that. The pipes I want to connect go into a drain which about 20ft long and runs alongside the house (i.e. not that far from the waste pipes), which I was going to connect to the drains using a universal drain adaptor. It has an inspection chamber either end of the run and I kind of figured that this would probably be sufficent if any blockage did occur, and worst comes to worst the point at which the waste pipe enters the adaptors would not be very far underground should I need to get to them.

Am I neglecting any other possible poblems you can think of?
P.S. Pavingexpert is a great site, keep up the good work. Thanks.

[Tony McC]

So: the branch connection(s) to the sink pick-ups - will it/they tap into the existing drain line within an IC? As long as you have access to the branch(es), there shouldn't be a problem (famous last words, I know!)

[TimIngham]

Hi All

I think I can "borrow" this thread because my query is similar.

First can I join with others in congratulating Tony McC on a great site!

I have an outflow from a kitchen sink that empties into a gulley in the standard way. I want to build a convervatory on the back of the house, and the outflow will be inside.

Can I seal up the gulley - perhaps replacing it with another type that offers a sealed inspection / rodding cover? I don't know very much about all this.

- Tim Ingham
(Manchester)

[lutonlagerlout]

yes the connections can be bought to do this ,only thing is you will have a rodding eye in the middle of your conservatory
get the builders to expose the pipe then the plumber can do his bit
cheers LLL

[flowjoe]

Not a big fan of internal gullies, particularly kitchen gullies as grease and fat can soldify in the trap.

Would it be possible to drop the kitchen waste pipes into a solid 100mm pipe that then runs beneath the floor and discharges into a back inlet gully outside of the conservatory footprint.

This way you have access to the system beneath the new build and you have a trap to prevent venting, you may need to get your builder to check out the available fall before this can be done.