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How to Protect Your Windows Before a Major Storm Hits

Last updated October 25, 2026

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The short answer

Why Protect Windows First

Windows are the weakest point in your home's exterior during a storm. High winds can shatter glass, letting rain and debris enter. Water intrusion through a broken window can damage walls, floors, and belongings quickly.

Taking time to protect your windows before the storm hits reduces the chance of costly water damage. Even if the glass holds, wind-driven rain can seep through small gaps. Sealing those gaps now helps keep your home dry.

  • Check for cracks or loose seals and repair them
  • Install storm shutters or use plywood panels
  • Apply impact-resistant window film
  • Trim tree branches near the glass
  • Move indoor items away from windows
  • Know where your main water shutoff valve is

Use Plywood or Shutters

Plywood is a common choice for quick protection. Cut panels to fit each window, using 5/8-inch exterior grade plywood. Pre-drill holes for screws so you can install them fast when a storm warning is issued.

Storm shutters offer a more permanent solution, especially in areas with frequent storms. They can be rolled down or closed over windows and are designed to withstand high winds. If you live in Kirkland, consider keeping a set of pre-cut plywood panels in your garage.

Apply Impact-Resistant Film

Impact-resistant film helps hold shattered glass together, reducing the chance of large shards entering your home. It is applied directly to the inside of the window and is relatively inexpensive. You can install it yourself with a spray bottle and a squeegee.

The film does not make the window unbreakable, but it can slow the wind and rain from entering. It also protects against flying debris. For better results, combine the film with plywood or shutters for extra strength.

Seal Gaps and Weak Points

Inspect the caulking around your window frames. Old or cracked caulk lets water in. Remove damaged caulk and apply a fresh bead of exterior-grade sealant. Also check the weatherstripping on operable windows and replace it if it is worn.

Pay attention to the area where the window meets the sill. Water can pool there and seep under the frame. A simple bead of silicone sealant can close that gap. These small fixes take little time but can prevent hidden leaks during a storm.

  • Use exterior-grade caulk for the frame
  • Replace worn weatherstripping
  • Seal the sill and the joint between frame and wall
  • Check window locks and hinges for a tight fit
  • Clean the weep holes so water can drain out

If Water Gets In

Even with good protection, a severe storm can push water through a window. Act quickly to move furniture and rugs out of the way and place towels or a bucket to catch drips. Dry the area as soon as the storm passes to prevent mold growth.

After the storm, inspect your windows and the surrounding walls for signs of moisture. If you find water damage, contact local water damage pros to assess the situation. They can identify hidden moisture and help with drying and repairs.

Water damage does not wait

Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.

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Frequently asked questions

What plywood thickness should I use for covering windows?

Use 5/8-inch exterior grade plywood. It is thick enough to resist most windborne debris. Thinner plywood may crack or bend. Pre-cut and label each panel for a specific window so installation is quick when a storm is approaching.

Can I use tape on my windows to prevent shattering?

Tape does not prevent shattering. It can hold small pieces together but will not stop the glass from breaking. Impact-resistant film is a better option. For real protection, use plywood or storm shutters.

How soon should I board up my windows before a storm?

Install protection as soon as a storm warning is issued, ideally 24 hours in advance. This gives you time to secure all windows and make sure the panels are firmly attached. Do not wait until the wind picks up.

Call Now (425) 406-3256