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Loft insulation - any unwritten rules?

Postby MulesMarinair » Fri Oct 05, 2007 3:20 pm

Hi all,
First time post here for me.

I'm laying insulation this weekend. 2 layers - 100mm and 170 mm

Ceiling joists are approx 165mm deep.

What would you lay between the joists - the 100mm and leave an air gap between that and the 170mm that will be laid perpindicular to it?
Or would you lay the 170mm between the joists and cross-lay the 100mm

(or does it really matter?)

I'm just concerned about the gap if I lay the 100mm between the joists.


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Postby kbrownie » Thu Oct 11, 2007 9:30 pm

there are regulations if laying over electric cables
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Postby blackcat » Mon Oct 15, 2007 8:04 pm

175 mm in between 100mm opperset direction
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Last edited by blackcat on Fri Feb 04, 2011 4:53 am, edited 1 time in total.
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Postby TONYTONE » Fri Feb 22, 2008 12:55 pm

Part L of the building regs has some good pics on which help to explain stuff like this. Godda leave gaps aroud electrics so they don't get too warm. Look up thermal bridging if you wanna get detailed. Drafts are a biggy as well.

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