170 over 100?

Joined
17 Oct 2005
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Hampshire
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United Kingdom
loft insulation.......?
is the 170mm roll worth the extra-over on 100mm rolls as far as efficiency compared to cost is concerned?
100mm rolls are about £2pm^2 and 170 rolls about £3.50 pm^2.
cheers
 
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I think the advice is to go for at least 150mm - so use the 100mm if topping up an existing layer, or 170mm if starting from scratch.
 

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