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Closed-cell backer rod is installed for air-sealing window and door rough openings.
Right - New flashing has been installed to complete the air and water control layers at the window openings of this wall retrofit that includes insulating the wall cavities with spray foam
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.