Pipes/electrics under lime plaster

[adamr7747]

Hi All,

I'm in the process of re-modelling our kitchen. The house is 19th century with blue lias walls on the ground floor. The stonework has been re-pointed with cement everywhere and had cement plaster on the internal walls. There was a significant rising damp problem! I haven't figured out the exact details of the solution to that, but it will almost certainly involve lime plasterwork and I've got a couple of questions which I haven't been able to find obvious answers to...

I'm planning on chasing 15mm plastic pipe in conduit down the walls for a couple of radiators. How far into the wall do I need to go, or, conversely, how thick will the lime plaster be, and how far can I intrude into it? (Needless to say chasing the stone walls is a serious headache so I want to minimise that!)

Related to this, does anyone know of a way to get the 15mm plastic pipe out of the wall? Hep2O and Speedfit do back-box "outlet cover"s but these are only for 10mm pipe.

Also, I'm going to have to replace a number of rusted electrical back-boxes with plastic ones. How deep should the replacements be?

Thanks a lot for any help,
Adam

 

[adamr7747]

Bump.

Sorry if I'm asking stupid questions! If so, please point me in the right direction!

Adam

 

[huddsspread]

What you need to do is what ever you put in the wall, make it below the stone edge, thats what i would do. Then it dont matter how deep or thin your plaster is.

Take note of where everything is incase you decide to nail a picture up, or sorry should i say someone you may be married too, decides to hammer something in the wall.....

 

[adamr7747]

OK, thanks. I guess sinking them deep enough to be flush with the wall is my "back-up" option.

I was hoping to be able to save a few mm though. (I figured that people put cable & capping under plaster...)

Adam

 

[peaps]

The damp is probably down to the cement render. Remove it all and apply lime render.