Drilling awkward 2" hole in masonry

SRG

I am drilling my ceiling joists to accomodate heating pipes. I have been using a right angle drill so far and it has worked fine. However, I am now trying to accomodate two 1" heating pipes which go through a 4" cavity wall (see attached diagram) and I cannot figure out how to do it as my SDS drill will not fit in between the joists. Has anyone any ideas? Any help would be appreciated.

Many thanks in advance,
Stephen

ircoha

what stage is the build at and where are u in relation to end of joist?

Is it possible to lift the flooring?

I am thinking you will need to possibly take out a block by drilling up at an angle from below and same on top and then 'gunter' it out.
Lots of drilling will make the 'guntering' easier

The thing that puzzles me most is what is a cavity wall doing as what looks like an internal wall?

SRG

Ircoha,

Thank you very much for your help. The house is finish roofed and plastered outside, upstairs inside is skimmed and we are now getting the ceiling joists downstairs drilled for the plumber. The end of the joist is embedded in the wall and the other end rests on a downstairs internal wall. The wall is a cavity wall because on one side the house is one storey and on the other it is 1 1/2 Storey. In other words, upstairs this is an external wall and downstairs it is an internal wall. I hope that makes sense.

If you can excuse my ignorance but what is ‘guntering’?

I can’t see how we could take out a block though because the joists on either side are very close to the wall. Possibly only 1” max clearance.

mrbig

Guntering is bashing bodging genneraly doing what ever to get the job done,
Some jobs need a hammer and chissel ,skinned knuckele and alot of swearing.
I agree with ircoha anything you can do to improve access is worth it and way faster in the long run to give youself room to work.:D

Good luck with the build.

ircoha

SRG: not looking good for a solution.
i presume by now you have completely rethought the plumbing layout.

Another suggestion is to add a 1 inch batten to the underside of the ceiling joist and run the pipes outside the joists if u follow. U should have enough head room, take off ur shoes:D

If u do this, please ensure that u put a thin flat metal plate over the pipes, attached to the battens so as the pipes will NOT have a screw/slab nail put through them.

Please do not succumb to the temptation of notching the joists

If u dont follow this PM me and I will post a sketch later

SRG

Dear Ircoha,

I have thought up a solution which I should have thought of before now (see diagram). I haven’t tried it yet but it should work. Thank you very much for all your help and interest on this, it is appreciated.

ircoha

Thanks for your kind words:)
Re the sketch, dont think even Tiger W would take on that shot:D
Qualplesx or similar is not that 'bendy'
Keep well