Instructions / Assembly

INSTALL DRIP CAP

CREATE “INTERIOR” AIR SEAL

Installation Instructions

for Vinyl Windows without Nailing Fin (JII011)

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 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 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. Backer rod can be used as a barrier (maximum 1”

depth) to prevent the low expansion foam from expanding into the water

drainage path.

If using a rigid sill pan, apply a bead of sealant to the upturned leg of the

sill pan and the window frame.

Sill pan

Sealant

Low expansion

polyurethane foam

Low expansion

polyurethane foam

Self-Adhered Flashing Sill Pan

Rigid Sill Pan

After Installation

• Ensure weep holes/channels are clear of debris for proper water

drainage. Do not seal weep holes/channels.

• Leave an expansion/contraction gap of approximately 3/8" between the

window frame and nal exterior wall surface (siding, stucco, etc.). For a

nished look and additional protection, seal this gap on the sides with

backer rod and sealant. If sealant is applied above the drip cap, ensure

the sealant bead is discontinuous to allow for drainage.

• Protect recently installed units from damage from plaster, paint, etc.

• Apply sealant to the backside of the dust plugs. Sealant will secure the

plug and make it weather tight. Wipe any excess sealant from around

the plug.

Sealant