Instructions / Assembly

CREATE “INTERIOR” AIR SEAL
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INSTALL DRIP CAP
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Installation Instructions
for Vinyl Windows with Integral Nailing Fin (JII001)
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NOTE: A drip cap is required for all vertically mulled units and
recommended for all products.
1. Apply a continuous bead of sealant to the top of the window frame.
See drawing.
2. Position the drip cap on top of the window frame and seat into
position with the aid of a wooden block and hammer or non-
marringmallet.
NOTE: Barb maybe trimmed back 1/4" on each end to better assist in
seating the drip cap into the accessory groove.
Continuous “Interior” Air Seal
NOTE: Shims may need to be cut back, so the interior air seal is
“continuous” between the window frame and the rough opening.
Create a required continuous air seal on the interior by integrating the
rough opening and the window frame with low-expansion polyurethane
foam or backer rod and sealant. NOTE: If foam is used, a 1/2" – 1" depth
is prescribed. Backer rod can be used to control the depth.
Sill pan
Sealant
Low-expansion
polyurethane foam
Low-expansion
polyurethane foam
If using a rigid sill pan, apply a bead of sealant to the upturned leg of the
sill pan and the window frame.
Self-Adhered Flashing Sill Pan
Rigid Sill Pan
Sealant