I'm planning on installing a toilet/shower in a first floor room. I'd like to take the soil pipe out through an external wall at a level between the floor boards and ceiling below. This would allow other connections for the shower and sink to be made under the floor.
The orientation of the floor joists means that there is one against the wall I'd like to core through. If I support the joist either side by bolting into the external wall can I core drill a 5" hole through it to take the soil pipe?
Any advice gratefully received.