I will be changing the drainage as part of a single-storey extension.
Old hopper currently drains bathroom and rainwater via hopper down a
pipe next to the soil stack, then into the sewer. Bathroom will be
changed to drain into the stack. But, what to do with the rainwater ?
The new roof will be in the way of the rainwater pipe, which I shall
remove anyway. The new roof will have its own gutter, entering a gully
I suppose. The question is, should I let the house roof rainwater drain
onto the extension roof and into it's gutter, change the house gutters
to drain directly into the extension gutter, or some other arrangement
? Are there regs concerning the amount/size of pipework to cope with
the rainfall from a whole house ?
Thanks,
Simon.