4 INTERIOR SEAL
Caution: Ensure use of low pressure polyurethane window and door insulating foams and strictly follow the foam manufacturer’s recommendations for application. Use of high pressure foams or improper application of the foam may cause the window frame to bow and hinder operation.
A.Apply insulation foam. From the interior, insert the nozzle of the applicator approximately 1" deep into the space between the window and the rough opening and apply a
1" deep bead of foam. This will allow room for expansion of the foam and will minimize squeeze out. Apply sealant across the interior surface of the shims to create a continuous seal. Follow foam manufacturer’s instructions.
Note: It may be necessary to squeeze the end of the tube with pliers to be able to insert into the space between the new and existing window frame. DO NOT completely fill the space from the back of the blind stops to the interior face of the opening.
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B.Check window operation by opening and closing the window.
Note: If the window does not operate correctly, check to make sure it is still plumb, level, square and that the sides are not bowed. If adjustments are required, remove the foam with a serrated knife. Adjust the shims, and reapply the insulating foam sealant.
C.Inspect the foam after it has cured. Fill any voids with foam prior to installing interior trim.
D.Reinstall the existing interior sash stops or new trim as desired.
5 EXTERIOR SEAL |
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A. Place a corner bead of sealant at the jambs | 5A |
and head connecting the existing frame and the | |
replacement window frame. |
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Caution: DO NOT seal the bottom exterior to allow for |
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incidental water to weep. |
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B. Check to ensure the sill adapter is properly seated. |
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If the window sill appears humped in the center, |
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carefully push sill down to straighten. |
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