The short answer
Measure and Cut Plywood Panels
Start by measuring each window frame from the outside. Measure the width and height at the edges, not the center, because frames can be uneven. Add 8 inches to each dimension so the plywood overlaps the frame by 4 inches on all sides. This overlap gives the board a secure surface to grip.
Use 5/8-inch exterior-grade plywood for the right balance of weight and strength. Thinner panels can flex and break under wind pressure. Have the lumberyard cut the panels to size, or cut them yourself with a circular saw. Mark each panel with the window it fits so installation goes quickly when the storm is near.
Drill Pilot Holes and Mark Fasteners
Pre-drill pilot holes through the plywood so screws go in without splitting the wood. Place holes about 2 inches from each edge and every 12 to 16 inches along the perimeter. Use a drill bit slightly smaller than the screw diameter. This step saves time when you are hurrying to board up.
For masonry or brick walls, use concrete anchors or lag bolts with a hammer drill. For wood siding, use 3-inch exterior-grade screws. Keep a labeled bag of screws and bolts with each panel. Store everything together so you do not hunt for hardware during a storm warning.
- Measure each window separately; frames vary.
- Use 5/8-inch plywood for wind resistance.
- Overlap the frame by at least 4 inches on all sides.
- Pre-drill holes to prevent splitting.
- Choose screws or bolts based on your wall material.
- Label each panel with its window location.
Install Panels from Inside or Outside
If you can reach the outside safely, install the panels from the exterior. This method allows the board to press against the frame, which resists wind better. Use a ladder with a helper to hold the panel steady. Work from the ground up, and never stand on a ladder in high winds.
If outside access is dangerous or impossible, you can install from inside. Place the panel against the frame from the interior and drive screws through into the frame. This method works but leaves screw heads visible indoors. Either way, make sure the panel sits flat and flush so wind cannot get underneath.
Prepare for Cleanup and Repairs
After the storm passes, remove the boards carefully and store them flat in a dry place. Inspect windows for cracks, broken seals, or water damage. If water got in, dry the area quickly to prevent mold. Check the framing around the window for rot or soft spots.
If you find damage, you may need to replace the window or repair the surrounding wall. A local water damage pro can help assess moisture issues and dry out affected areas. For structural problems, consult a contractor or a window replacement professional. Acting quickly limits long-term damage.
- Remove boards after the storm passes.
- Store panels flat and dry for reuse.
- Check for cracks, broken seals, or water intrusion.
- Dry any wet areas to prevent mold.
- Inspect window framing for rot or softness.
- Call a professional if damage is extensive.
Know When to Call a Pro
Boarding up is a doable DIY task for most homeowners. But if a storm has already hit and windows are broken, the priority is safety. Clear debris and cover openings with plastic or boards temporarily. Do not enter rooms with standing water or sagging ceilings. See a doctor if you feel unwell from mold or fumes.
For water damage, mold growth, or structural issues, contact local water damage pros. They have the tools to dry, dehumidify, and restore your home. If you live in Caldwell, keep your shutoff valve location written down. Policies vary, and your insurer decides what is covered.
Water damage does not wait
Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (208) 729-2441Frequently asked questions
What type of plywood should I use for boarding windows?
Use 5/8-inch exterior-grade plywood. Thinner panels can bend or break under strong winds. Exterior-grade plywood resists moisture better than interior types. If you live in a semi-arid climate with cold winters and hot dry summers, plywood may dry out, so store it flat and off the ground.
How long before a storm should I board up windows?
Act as soon as a storm watch is issued, not when the warning comes. You need time to measure, cut, and install panels safely. Pre-cut panels and hardware ahead of storm season so installation takes minutes. Do not wait until winds are already strong.
Can I board up windows from inside my house?
Yes, you can install panels from inside if outside access is unsafe. Place the panel against the frame and drive screws through into the frame. This method works but leaves screw heads visible and may not seal as tightly. For proper wind resistance, install from outside when possible.