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Closed-cell backer rod is installed for air-sealing window and door rough openings.
Example sill detail of replacement window in conjunction with siding replacement
Failure of Roof Structure from Pressurization Due to Window Failure During a Hurricane.
Proper flashing around windows is especially important when the rigid foam serves as the drainage plane in the wall
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 – Appropriate use of framing members to support double windows and additional cripples for drywall purposes
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.
Single framed wall converted to double wall and insulated with closed-cell spray foam
Wrong - House wrap tape is not fully adhered at seam and flashing tape is missing from window head, jamb, and corner above window.
Wrong - Stucco has rotted and cracked above a window because of water damage due to lack of proper flashing and drainage.
Wrong - Water has gotten behind the paint, possibly due to lack of window flashing, leading to blistering.
Wrong - Window sill trim was too tall for window frame and was poorly modified in an attempt to provide drainage out of the window.
Wrong – Fibrous insulation is not an air barrier and cannot be used to air-seal openings.