Making a 52mm hole from the outside only

[Mark Carver]

Need to run a 40mm waste pipe through a cavity wall.

There's one constraint, there's not the clearance on the inside (because of kitchen units, and copper piping) to use a drill, (or even get access with anything else) to attack the inner leaf.

Making the hole on the outside is easy, and easy to determine the the exact point required. A core drill could presumably do that bit ?

How feasible would it be to attack the inner leaf, from outside. Lots of holes right through using a long 12mm drill, and a cold chisel ?

[Tim Lamb]

In message , Mark Carver writes

Just core right through?

My core set comes with an extension piece and will easily reach through an 11" cavity.

I'm curious to learn how you know where to drill:-)

regards

>

[Mark Carver]

Ah,

Well, bugger me. Thanks Tim !

There's already a hole the same height as the required one, further along the wall, so that can serve as a reference.

[John Rumm]

Easy enough to core from one side only with a 8" arbour and a 6" deep core...