Purchase Window Jamb Extension Clips to secure the jamb extension to the wall framing. The clips stop the Jamb Extension from bowing when foam or fiberglass insulation is applied and there are no insulation voids.
Your pack contains four clips, four 1/2" screws and four 2" screws.
Install 1/2" screws to the Jamb Extension and 2" screws into the wall framing making sure the Jamb Extension is plumb.
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