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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
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 double-pane windows have low-emissivity coatings on three surfaces to reduce heat transfer through the glass allowing in views but preventing heat loss in winter and heat gain in summer.
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
Table of Maximum Fenestration U-Factor Requirements for New Homes as Listed in the 2009-2021 IECC and IRC