• Adjustable Fit: Two-piece design fits most window sill widths (up to 5' wide rough openings).
• Molded Corner Protection: Seamless corner design offers added defense where leaks are most common.
• Durable Construction: Made from robust molded PVC that won’t rust, rot, or corrode.
• Cold-Weather Install: Installs in temperatures as low as 0°F without compromising performance.
• Positive Drainage: Molded to promote water drainage away from the sill, enhancing performance.
• Backdam Protection: Integrated backdam adds a secondary moisture barrier.
• Easy Installation: Embossed fastener guides for consistent, secure placement.
• Compatible: Pairs with DuPont™ Weathermate™ Straight/Flexible Flashing and Great Stuff Pro™ sealants.

Use on:

• Wood-framed window openings
• OSB or plywood sheathing
• Foam sheathing (with compatible WRBs)
• Rigid insulation boards (Styrofoam™, Polyiso)

Ideal for:

• Residential window installations
• New construction and remodeling
• Projects requiring code-compliant, mold-resistant sill flashing

1. Position & Attach: Place the first corner piece on the window sill over the water-resistive barrier. Press firmly into place and secure with nails or staples using the embossed guides.
2. Overlap & Seal: Overlap the second piece by at least 2". For openings over 5', cut a third piece and place it centered between corners with a 2" overlap on each end. Secure accordingly.
3. Flash & Seal: Seal all seams and edges with DuPont™ Weathermate™ Flashing. Flash window jambs and headers per standard best practices.
4. Final Interior Seal: Use Great Stuff Pro™ Window & Door Foam Sealant around the interior perimeter to reduce air infiltration.