Rockwool 100mm semi rigid Accoustic insulation - electric cables

[Draughtsman]

I was thinking of putting some of this up in a ceiling whilst I have the joists bare, from below that is, before putting new plasterboard up. Will it be ok to just lie any cables on top of it?

Thanks
Dain

 

[JohnD]

yes

you can have cables on top of it (so any heat can escape upwards) or underneath (so it can escape through the ceiling), but not surrounded/buried in insulation.

 

[John D v2.0]

if they're lighting cables, then there's a high chance they'll be ok regardless of any insulation. If there is a shower cable in there, it will almost certainly have to be touching/clipped to timber or plaster and able to dissipate the heat.