New loft insulation or rewiring first?

Postby Pat2009 » Sun Feb 01, 2009 2:17 pm

Hi - first post!

I plan to have my loft insulated and the house rewired, and am wondering which should be done first. You can tell I'm not a DIY-er, much less a skilled person :)

Is the rewiring done first, and the cabling clipped to the joists as it is now? If so, the new insulation will cover the cabling. How do you protect the cabling against fire? Or should the insulation be done first, making it necessary to mark the cabling routes somehow?

Thanks for your advice!

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Simply Build It

Postby stoneyboy » Sun Feb 01, 2009 10:47 pm

Get the wiring done first and make sure your installer is fully aware of the depth of insulation you intend adding. If you get a quote make sure the proposal to sdd insulation is acknowledged in the quote.
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Postby kbrownie » Mon Feb 02, 2009 8:22 am

Special calculation are made for cables that run/route straight through thermal insulation and this calculation will effect the cable size.
It would be easier for your electrician to re-wire without insulation there (By no means impossible). In form your electrician what you intend to do, if he places the cable so it can lay above insulation or is not covered by it, it will be okay. If cable is installed through insulation a larger cross sectional cable will be needed to take the heating effect in to consideration.
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Postby Pat2009 » Wed Feb 04, 2009 6:16 pm

Thanks for the replies, they're very helpful, much appreciated.


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