Drilling for Tap Timber Framed Wall

[steph57]

Hello,
following some previous good advice here I am having a go at fitting an outside tap on a timber framed house wall.
I have made a small exploratory hole on the inside where I am looking for the pipe to go through. Gently feeding a thin probe into this hole it goes through to a depth of 105mm, so it looks as though I have thankfully missed any studwork.

As the wall is 270mm thick and with the brickwork accounting for 100mm I am guessing that the remaining 65mm is the plywood outer sheathing and then the cavity? Does that seem about right?

I have restricted space on the inside, enough for the plumbing work but not enough to get a drill in. Is it OK to do all the drilling from the outside, with a thick masonary drill through the brickwork and then switching to a long wood drill to go through the plywood sheathing?

 

[AronSearle]

Page 18

http://www.google.co.uk/url?sa=t&rc...=5ivv4BF8lTziG4tllIm9Ug&bvm=bv.73231344,d.ZGU

 

[steph57]

Thanks for the link very helpful.
Because of limited inside space i really need to do all the drilling from the outside drilling in, is that OK or will that cause problems?

Referring to the link I think I am OK but would just like a second opinion.
I can probe 105mm into the wall from the inside and then hit a stopping point. The wall is 270mm thick and with the brickwork accounting for 100mm I am guessing that the remaining 65mm is the plywood outer sheathing and then the cavity? Does that seem about right?