I'm replacing a shower tray and I've discovered that the waste pipe runs approximately 25cm below the floor (it's a loft conversion with a deep cavity between the old ceiling and the new floor). The previous solution was a 90deg bend pointing straight down from the waste, a length of vertical pipe, and then another 90deg bend to connect to the horizontal pipe. Is this an acceptable/sensible solution? I think a gradual fall is preferred but there's limited space between the joists.
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