Strengthen Your Home through Proper Window Installation

02/09/2023

Why does it matter?

Proper installation is critical to window performance during hail and high-wind events as design pressure (DP) ratings and impact-resistance affect optimal performance. Window manufacturers specify the proper way to install their products, and following the instructions will help ensure your windows deliver performance consistent with their ratings.

What do I need to know?

• Window installation will often require a building permit and inspection.
• Hardware used to secure the windows should penetrate the home’s structural frame and not just the exterior finishes.
• Self-adhered flashing, commonly called “window tape,” is used to seal window openings securely. Apply the tape after the window is installed first from the bottom sections and up to the top. Each section above should overlap the section below to create an effective drainage path.
• The most commonly used replacement windows have a “flush fin,” a vinyl fin that surrounds the window frame’s perimeter and is flush with the existing window’s exterior flashing “fin.” Make sure to place your nails in the correct part of the fin before covering it with self-adhered flashing.

Where do I start?

Replacing your windows

• Check with your local building department for information about the design pressure rating and any windborne debris protection requirements required in your area, and whether or not installation requires a permit and inspection.
• Follow all manufacturer's specifications as incorrect installation may cause a voided warranty or, worse, a product failure that presents a threat to life and property.
• If you are hiring a contractor to install your windows, verify that they are licensed, bonded, and insured. Use verified, third-party reviews online, and collect references from your neighbors when choosing your contractor.