Use a manufacturer-approved type of sealant to bond the window to the membrane before setting, squaring, and fastening the new window.

To learn how to install nail-fin windows in 5 common wall types, check out this playlist: [ Ссылка ]

When installing a nail-fin window in a wall with self-adhered membrane, such as Henry Blueskin VP100, the process starts with shims under the window—in this case, cut offs of bevel cedar siding. Besides creating a level surface, these shims support the jambs to prevent deflection, and also create a gap under the window, which aids in the drainage process should that ever become necessary. Care is also taken to center the window in the opening, setting the stage for effective air-sealing work, which will come later in the process.
Depending on the style of nail fin found on your particular window, the process of preparing the unit for installation may vary. On this Pella window, the metal fins are attached at the factory and folded down for shipping. After getting the nailing fins unfolded, the window is test-fit and traced, providing a target area for applying sealant under the fins. If all of the above is done carefully, setting and fastening the window is fast and easy.

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