Hi, I've got a problem which I can't see a solution to, a future customer of mine wants to add a low level shower where a bath used to be, the shower tray is 1600 x 900, this would require a 40mm waste to go below the floor, but the joists are not big enough to allow a 40mm waste to be drilled (based on a allowing 25% hole size in relation to joist size), I can't see a solution, raising the tray is not an option, it's too big and would have to be too high....any ideas? The picture shows the location of the tray and you can see the old bath waste in the wall. The waste has to run under the floor where the legs are in the photo.
Stairs to the left, outside wall is top of the picture external soil stack, you can see the toilet connection, to the right is a bedroom with a sink hence the waste pipe coming through the wall.
If no good below, run waste between joists to external wall and then around building to stack - do this in 50mm pipe internally, possibly stepping up to 110 before the stack if it’s a long way.
Thanks for the advice chaps, I've confirmed the joist size which is 175mm so I can take 44mm out according to regs, I'll just stretch by a few mm and the pipe will go.
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