I want to install a basin in a bedroom adjacent to the bathroom, run the pipes through the wall and tee-in to the existing waste pipes. The distance between the two basins will be 1m, and the drop from the new to where it will tee-in with the existing pipe will be 35cm. Should I allow the drop to happen as soon as the pipe comes through the wall, or should I do a gradual decline to bring it down to the same height as the existing pipework?
The (more than 20yr old) existing waste pipe is wider than 32mm but it's hard to measure without cutting it out, but maybe 38/40mm. The existing basin currently has a drop of 35mm with the waste run of 138mm before it leaves the bathroom, and no problems with water from the trap siphoning away.
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