Will fiberglass insulation retain interior heat that a thermal barrier (foil) will not?
I have an unheated shed for gardening tools, equipment, and chemicals that has foil backed plywood walls and roof sheeting. I plan to install standard plywood to the interior walls. Summer temps average 90 to 100 degrees max so the thermal barrier of the foil should provide some insulating value to keep the interior somewhat cooler. I am concerned that winter temps that typically dip to the 20s but occasionally could dip lower, could cause something in the shed to freeze. Although insulating the walls could render the foil thermal barrier ineffective, should I nevertheless insulate for the winter cold? Is there an insulation that could be used in conjunction with the foil backed plywood that would retain the air gap needed to make the thermal barrier effective?
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