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Closed-cell backer rod is installed for air-sealing window and door rough openings.
Right – Backer-rod is a foam product available in various diameters that can be used to air-seal openings around doors and windows.
Right – The rough opening around the window has been filled with low-expansion foam to air seal.
Right – The rough opening around window has been filled with backer-rod to air seal.
Wrong – Fibrous insulation is not an air barrier and cannot be used to air-seal openings.
Wrong – This electric wiring hole was filled with foam that is not protected with copper mesh or hardware cloth so rodents could chew through the foam and enter the house (see Solution Center Guide "Reduce Pest Intrusion").