I'm fitting a corner sink without a pedestal into a small cloakroom and want to hide the 1.25" waste pipe. I can't get any access under the floor from the stud wall partition that it will be fitted to and I don't want to go straight through the outside wall and have a visible external waste pipe. So, I was wondering if I could chase it into the breeze block inner cavity wall. This would be approx. 8ft along the wall long and would eventually drop down to floor level where I can join it up the toilet waste pipe. I would then plasterboard over the exposed waste pipe.
Basically can I run the pipe through a hole chased into the inside of an exterior wall?
Basically can I run the pipe through a hole chased into the inside of an exterior wall?