Foam insulation with foil. How to install, foil facing out or in when installed behind vertical wood siding?

Question:

Answers:
Facing in! ~
You want to reflect internal heat back in.

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You want to face the foil side facing inside of the house. That foil is also a moisture barrier.

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foil should always be facing towards the heat aide or in.

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The foil is a vapor barrier. It must face toward the heated area.

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