UK Plumber Forum 

A place of resource for Plumbers and Gas Engineers in the UK.

For when your troubles just won't soak away, sort out your drainage issues in here.
By Drew1000
#5655
Hi,
I have a space of around 500mm between house wall and boundary to install both surface and foul 110mm drains at side of new build. The foul drain is deeper than the surface water drain. As the foul drain has more take offs for toilets etc I was planning on putting it closest to the house. Is there a minimum distance that the two runs need to be apart. I reckon there will be approx. 300mm of difference between the invert levels and assume the surface cannot go directly above the foul pipe. I am not allowed to use a combined system.
Any help or advice much appreciated.
User avatar
By REDSAW
#5658
Hi & welcome.
Not my subject either really, covered it in college once but i dont do anything that gets me dirty as i stick to gas lol

i did always think you couldnt go closer to foundations than 500mm though so that one puzzles me!!!
what local authority is it as i know Kent and the Home counties have tighter rules due to flooding?

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