Cavity IInsualtion causing rewiring problems

[covsparki]

Hi all,

I am having a problem on a job that has cavity insulation which has for some reason "poped out" of the cavity and is just behind the plasterboard so I'm having problems in dropping the cables for the switches & the rings. I would appreciate any idea's to get around the problem.
PS:- I've tried using the old cable to draw in the new ones but unfortunately the house is metal framed and thus every time I try this it gets undone when it passes the through the holes of the frame.

I'm sure there are some of you more experienced sparki's who have come across this - PLEASE HELP!!!
Thanks

 

[Job_n_knock]

Im a little confused. Cavity insulation is usually pumped into the cavity between the outside wall and its inner wall. I cant see why a metal stud wall was built on the inside of these walls for the insulation to "pop" into! Anyway assuming that this is the case I can see no other option than to use a stanley knife and cut chases. If you can get the cables part way down the walls then "stitch" the point of obstruction i.e. cut a hole when the obstruction starts and cut out the plasterboard until the obstruction ends and you have a free void to use again. Trying to pull cables through a metal stud will almost certainly damage the insulation as Im sure you are aware so Im afraid you have no other choice...unless you run surface mini trunking of course.

 

[Job_n_knock]

Just had another thought. If the plaster board is new just remove it, run the cables and fit new board...its easy. If its been plastered and painted then refer to my previous answer.

 

[ban-all-sheds]

Im a little confused. Cavity insulation is usually pumped into the cavity between the outside wall and its inner wall. I cant see why a metal stud wall was built on the inside of these walls for the insulation to "pop" into!

Doubt if it has - it's almost certainly insulation that's in the right place - i.e. between the plasterboard and the wall....

 

[covsparki]

Hi ,
Thanks for the replies,.....

The whole house is a metal stucture with even the joists and roof made of metal members,.....The bricks are on the outside and inside with a cavity in between,....
The insulation is a foam based one which is right behind the plasterboard and also within the cavity.

I think I will have to have a go at chopping in channels and see what happens to get around the metal bits,....

Looks as though it will have to be the long route on this one!!!

Any more ideas most welcome.

Thanks everyone who replied.