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N. Thornton
 
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Default Insulating a narrower wall cavity

From: )

Of course the first idea was to install internal insulation but I've
found out that it is possible to save space and install cavity
insulation even in my old house.

Cavity insulation is better because it leaves the thermal mass of the
inner leaf in thermal contact with the house air. This reduces peak
summer indoor temps and reduces night time temp fall.

NT