The short answer
Measure the Window Opening
Start by measuring the width and height of the window frame, not the glass. Add 4 inches to each dimension so the board overlaps the frame by 2 inches on every side. This overlap keeps rain and debris out and gives the screws a solid grip.
If the frame is damaged, measure the rough opening in the wall. Use a tape measure and write the numbers down. A board that is too small lets water in; one that is too large is hard to secure. Take your time, even when you are in a hurry.
Cut the Plywood
Use exterior-grade plywood, at least 1/2 inch thick. A 3/4 inch sheet is stronger and resists warping better. Cut the board with a circular saw or have a hardware store cut it to size. If you do not have a saw, a handsaw works, but it takes longer.
Beveled edges are not necessary. A straight, square cut is fine. Sand any rough edges to avoid splinters. If you have multiple windows, cut boards for each one now and label them with a marker so they fit the right opening later.
- Use exterior plywood, not interior
- Choose 1/2 inch or thicker
- Cut with a circular saw or handsaw
- Label each board for its window
- Sand edges to prevent splinters
Secure the Board
Position the board over the opening, centered so the overlap is even. Drive exterior screws through the plywood into the window frame. Use screws that are long enough to bite into the frame, at least 1.5 inches. Place screws in each corner and every 8 to 10 inches along the edges.
If the frame is rotted or broken, screw into the wall studs instead. You may need to drill pilot holes. Avoid using nails, because they pull out easily in wind. For a temporary fix, a few screws are enough, but more screws make the board sturdier.
- Use exterior screws, not nails
- Screw into the frame or wall studs
- Place screws every 8 to 10 inches
- Drill pilot holes for hard wood
- Add extra screws if the board feels loose
Handle Water Damage
A broken window lets rain and snow in, which can soak carpets, drywall, and flooring. Dry the area as soon as you can. Use towels and a mop to remove standing water. Move furniture and rugs out of the way so they do not absorb more moisture.
If water has already soaked into walls or floors, you may need help from local water damage pros. They have equipment to extract water and dry structures. Check the related pages for water damage inspection and structural drying services to understand what the work involves.
Prevent Further Damage
While the board is up, keep an eye on the weather. If heavy rain is expected, add a tarp over the board and secure it with staples or rope. This extra layer keeps water out even if the board shifts. Check the board after storms to make sure it is still tight.
A boarded window is a temporary fix. Plan to replace the window soon. If you live in Layton, you can ask a window replacement service about new windows. Also, if you are dealing with moisture inside, a dehumidifier can help dry the air. See a doctor if you feel unwell from mold exposure.
Water damage does not wait
Call (801) 383-0232 any time, day or night, and describe what happened.
Call Now (801) 383-0232Frequently asked questions
What type of plywood is right for boarding a window?
Exterior-grade plywood, such as CDX, is a sensible choice because it resists moisture. At least 1/2 inch thick is good, but 3/4 inch is stronger. Do not use interior plywood, as it can swell and rot quickly.
How long can a boarded window stay up?
A boarded window can stay up for a few days or weeks, but it is not a permanent fix. Check the board regularly for looseness and water leaks. Replace the window as soon as you can to protect your home.
What if the window frame is broken too?
If the frame is damaged, screw the board into the wall studs instead. You may need longer screws. For a very large opening, use two boards. A professional window installer can tell you if the frame needs repair or full replacement.