The waste sits under the tray between the joists, and runs out to the external wall. You don't, although fortunately I can get at it from outside as the pipe has access hatch thing.
Also if I have a problem I'll just cut into the plasterboard ceiling downstairs as it'll be compromised at that point anyway.
The waste sits under the tray between the joists, and runs out to the external wall. You don't, although fortunately I can get at it from outside as the pipe has access hatch thing.
Also if I have a problem I'll just cut into the plasterboard ceiling downstairs as it'll be compromised at that point anyway.