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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.