Rainwater downpipe into soil stack

[Riley]

I'm after some regs advice on this if possible

Have a customer who has basically been stitched up by dodgy builder

He has basically left her with two guttering downpipes terminating into nothing just straight out onto her garden which is now causing flooding and water damage to the lower part of the wall. I'm thinking not but she has a downstairs toilet with a horizontal soil run going to the main stack.

She is basically wanting to know if The guttering can go direct into the soil pipe I am just trying to find something appropriate that I can show her

 

[chris watkins]

No they can't be discharged into the soil stack.

Even if the drainage arraignment is a combined system just think what would happen if the soil pipe blocked & it started to rain!!!

As water "finds it s own level" & you can't turn the rain off, water would poor out of the WC (lowest fitting) flooding the property until it stopped raining.

Have a look at Part H 3 Building Regs

[DLMURL]https://www.gov.uk/government/uploads/system/uploads/.../BR_PDF_AD_H_2015.pdf[/DLMURL]

Sounds like she needs a soak away or other infiltration system installed.

 

[Riley]

Thank you. I couldn't think of a good example why not. It'll have to be a soak away it's gonna be a horrendous job though

 

[Shower Engineer]

If a combined system is allowed in this area couldn’t you use a back inlet gulley and go underground into the nearest manhole?