Radiant barrier on attic floor over insulation

Old 06-11-23, 12:12 PM
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Radiant barrier on attic floor over insulation

I installed perforated radiant foil barrier over the insulation in the attic about 5 years ago. Recently went up into attic and saw a lot of dust on all of it. There are 2 gable vents on both ends of the attic across from one another for ventialtion as well as a roof vent and the insulation is well back from the soffits for air flow which are 2' wide and run the length of the house.

I am assuming the dust makes the barrier heavier which causes the fiberglass insulation below it to be less effective.

If I put perforated radiant foil barrier on the rafters and cover the gable ends, will it be enough and remove the raidnat foil from the attic floor?

I want to keep the heat out of the attic during the summer months without losing insulation value during the winter (northern lower michigan).
Old 06-11-23, 12:23 PM
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You do not keep heat out of the attic. The attic should be as close to outside as possible. That is why you have ventilation. You insulate the attic floor not the bottom of the roof.

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