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Will doubling up reflective insulation layers help?

Will doubling up reflective insulation layers help?

Can the thermal performance of a building be improved by doubling up reflective insulation?

Doubling up the number of reflective insulation will improve the thermal performance, but only marginally remembering that if there is not an air space between the reflective surfaces then you will not achieve its maximum thermal potential. Placing one layer on top of another will only double up on the resistance of the bubble, while providing an air space between them will still double the resistance of the bubble, but will also introduce an additional reflective air space, with reflective foil on both sides of that air space. In most cases, you can combine reflective insulation with batts insulation to extract the maximum benefit of both insulation materials.

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