Use expanding spray foam insulation or caulk to seal any gaps you find. For larger openings, rigid foam boards can provide a more durable solution. Don’t forget the attic hatch or access door ...

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Attic insulation: Check the thickness of your attic insulation. Aim for at least 10 to 13 inches to achieve an R-30 rating. If it’s less, consider adding more insulation to prevent heat loss.