Insulation issues with pipes and cables

[ADCG22]

Hi all

I'm just about to insulate the kitchen ceiling at the weekend with Rockwool slabs. From the picture you can see copper pipes and electrical cable within the ceiling cavity.

What is the correct method for insulating around these? to apply the slabs above the cables/pipes or below them?

Thanks!

 

[stem]

I can only comment about the cables. When cables are enclosed in insulation, their current carrying capacity is reduced. When the circuits were designed the cables would probably have been suitable for installation outside of insulation. If you cover them with insulation, they may no longer be suitable for the application and if so should be replaced with larger cables. Cooker and shower circuits in particular are prone to this.

The table below illustrates, notice the difference in current capacity when in 'thermal insulation' as opposed to 'clipped direct'

 

[cjard]

Reduction in CCC would be better posed to the sparks over in the relevant forum here.. Your table is for methods A-C, rather than 101 or 102 which would probably apply here.

Scooch to better answer your question we need to know how much insulation you're proposing and what is on the other side of those floorboards that make the highest visible part of the room

when you come to fit insulation support it either with strips of wood cut thin enough to be springy, and slightly longer than the joist gap, then spring them into place like mini bridges, arched up holding e wool in, or use strips of fabric/roof felt/brick tie band etc and a stapler to hold the wool up

If the other side of the ceiling were e,g the world, then I'd ensure the cables were above the insulation, clipped direct to a conductive surface, and the
the pipes were lagged or buried in the insulation