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Insulating a narrow cavity

bissoejosh
in Heat Insulation

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I've got a small area of wall with two skins of block/brick with a gap 15-20mm that I want to fill with insulation, it's below DPC so I don't think mineral wool etc. Current idea is either spray foam or loose EPS beads/shavings.

 

Any other options I might of missed?

 

 

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