Re: bath wastes sizes
The answer that it doesn't matter is wrong!!!! The limit is 3.0m beyond this (or if you have problems) you should consider installing some method of ventilating the pipe IE running an additional pipe to allow air into the system to prevent the foramtion of a vacuum in the pipe as water flows through it or putting an air admittance valve in the system. With 50mm pipe you only allowing an additional 1m (limit 4m).
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