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Shower trap, venting and Part H requirements
There is no specific requirement for a HepVo trap, and we normally suggest that a standard ‘water trap’ is perfectly fine. However, there may be a requirement to vent the waste drain pipe, if sufficiently long.
Approved Document – Part H, section 1 of the building regulations is applicable to sanitary pipework and is predominantly concerned with ensuring that the water seal or trap is not cleared during normal use, due to pressure differentials within the sanitary pipework. However, as we (Recoup) are not normally involved in the specific M&E design of any given project it is impossible for us to give specific guidance or signoff for Part-H, other than to say “WWHRS must be installed with consideration to the most recent ‘Approved Document – Part H of the Building Regulations’ for preventing the ingress of foul sewer gases.” As per our installation instructions.
The specifics of the sanitary pipe work layout and design would normally come from the architect, M&E of build services designer. What we can advise is that according to Part H1 Foul Water Drainage, based on a 40mm waste pipe diameter, a 3.0m maximum length from the shower trap to the discharge stack is allowed before venting of the waste pipe is required.