Your Window Is Broken, Now What?
You hear the crash, or maybe you come home to find it. A storm, an accident, or an attempted break-in has left a gaping hole where your window used to be. The immediate feeling is one of vulnerability. The outside world is now inside, bringing with it weather, insects, and a significant security risk.
Boarding up a broken window isn’t just a home repair task; it’s an essential emergency measure. It’s the critical barrier you erect between your home’s interior and everything you want to keep out. Doing it correctly the first time can prevent thousands of dollars in water damage, deter further security threats, and give you the breathing room to arrange for a proper, permanent repair.
This guide walks you through the entire process, from the initial safety assessment to the final, secure installation. We’ll cover the tools you need, the materials that work best, and the common pitfalls to avoid, ensuring your temporary fix is robust and reliable.
Safety First: Before You Touch a Single Shard
Your instinct might be to start clearing glass immediately, but pause. Your personal safety is the absolute priority. Broken glass is incredibly sharp and can cause severe cuts, even through work gloves.
Begin by carefully assessing the situation from a safe distance. Is the glass still in the frame, or is it completely gone? Are there large, dangling pieces? If the break was caused by a storm, ensure no structural damage around the window frame compromises the wall. If it was a break-in, do not enter the property if you suspect an intruder might still be inside; contact law enforcement first.
Once you’ve determined it’s safe to proceed, put on the right personal protective equipment (PPE). This is non-negotiable. You will need heavy-duty leather work gloves, safety goggles to protect your eyes from flying fragments, long sleeves, and sturdy closed-toe shoes. For extensive breaks, consider a dust mask to avoid inhaling any fine glass particles.
Gathering Your Emergency Board-Up Kit
Having the right materials on hand makes the job faster, safer, and more effective. While a trip to the hardware store is likely in order, here’s what you should aim to acquire.
The Essential Materials
For the board itself, 1/2-inch or 5/8-inch thick plywood is the gold standard. It’s strong, readily available, and provides excellent security and weather resistance. OSB (oriented strand board) is a cheaper alternative but is more susceptible to moisture if the boarding will be in place for more than a few days. Measure the window opening and add at least 4 inches to both the height and width. This overage is crucial for securing the board to the solid framing around the window, not just the damaged trim.
For fasteners, you need exterior-grade screws, at least 2.5 to 3 inches long. Deck screws or construction screws with a corrosion-resistant coating are ideal. Avoid nails for a temporary emergency board-up; screws provide far superior holding power and are easier to remove later. You’ll also need a roll of heavy-duty duct tape or, even better, contractor-grade clear sealing tape for initial containment.
A heavy-duty plastic tarp or sheet of plastic sheeting is vital if rain is imminent and you need a quick, initial moisture barrier before you can install the wood.
The Necessary Tools
A tape measure and a pencil are for accurate sizing. A circular saw or a handsaw will cut the plywood to size. A power drill with the appropriate drill bit for pilot holes is essential for driving screws without splitting the wood. A utility knife will help trim plastic sheeting. Finally, keep a heavy-duty broom and dustpan, a vacuum cleaner (with a hose attachment), and a sturdy box for glass disposal nearby.
Step-by-Step: Securing the Opening
With your safety gear on and materials assembled, follow this sequence to secure your home effectively.
Contain and Clean the Area
Start by containing any loose glass inside. Carefully place large, stable shards into your disposal box. For the countless small pieces on the floor and sill, use the broom and dustpan first, then follow up with a thorough vacuuming. Be meticulous; a single missed sliver can cause injury later.
If the window frame has any remaining jagged glass, use the duct tape to create a “criss-cross” pattern over the entire opening from the inside. This does two things: it catches any loose fragments, and it creates a temporary barrier against wind and bugs. For a very large hole, you can quickly tape a plastic tarp over the opening from the inside as a stopgap moisture shield.
Measure and Cut the Board
Measure the exterior window opening from the outside. Measure from the outer edge of the wooden trim or siding on one side to the other, and from the top trim to the windowsill or bottom trim. Add 4 inches to both measurements. This ensures your plywood will cover the opening and have a solid 2-inch lip of wood on all sides to screw into the house’s sheathing or stud framing.
Transfer these measurements to your plywood sheet, mark them clearly with a pencil and a straight edge, and cut the board to size using your saw. Always cut in a well-ventilated area and wear safety glasses during this step.
Install the Board Securely
This is the most critical step. With a helper if possible, lift the cut plywood and position it over the exterior of the window opening. Center it so the overage is even on all sides.
Before driving any screws, use your drill to create pilot holes through the plywood and into the house framing. Space these holes approximately every 8 to 12 inches around the entire perimeter of the board. Piloting prevents the wood from splitting and makes driving the screws much easier.
Begin screwing the board into place. Start at the top corners to hold it, then work your way around. Ensure each screw is driven in firmly and flush with the plywood surface. The goal is to create a tight seal. The board should not flex or buckle when pushed. If you are boarding a very large window, you may need to add a vertical 2×4 brace behind the center of the plywood for extra rigidity, screwing through the plywood into the brace.
Troubleshooting Common Board-Up Challenges
Not every window is a standard rectangle in a flat wall. Here’s how to handle tricky situations.
Dealing with Sliding Glass Doors or Picture Windows
For large, floor-to-ceiling or sliding glass doors, the principles are the same, but scale changes everything. The plywood will be heavy and cumbersome. You will absolutely need one or more helpers. For spans wider than a standard 4-foot plywood sheet, you will need to join two sheets. Butt them together over a vertical stud in the wall, and screw through both sheets into the stud. Consider using horizontal 2×4 battens across the seam on the outside for added strength.
Sealing Against the Weather
A board stops wind and intruders, but wind-driven rain can still seep in through the seams. For a more weather-tight seal, after the board is screwed on, run a thick bead of silicone caulk or butyl rubber tape around the entire perimeter where the plywood meets the siding. From the inside, you can also use expanding foam sealant around the edges of the window frame to plug gaps, but be careful—this foam expands significantly and is messy to clean up later.
What If the Window Frame Is Damaged?
Sometimes the impact damages the wooden frame itself, making it too weak to hold screws. If the frame is splintered or rotten, your screws must reach deeper. You need to locate the solid wall studs or sheathing around the window. This may mean using longer screws, 3.5 to 4 inches, to bypass the damaged trim and bite into the solid structural wood of the house. Tapping on the siding can help you find solid spots.
From Temporary Fix to Permanent Repair
Your window is now boarded, secure, and weatherproofed. This is a successful emergency response, but it is not a permanent solution. Plywood blocks light and is not energy efficient.
Your immediate next step should be to contact your insurance company, if applicable, to report the damage and understand your coverage for window replacement. Then, call at least two or three reputable window installation or glass repair companies to get estimates for a permanent fix. When you remove the plywood for the replacement, have your tools ready to quickly re-install it if the new window cannot be fitted the same day.
For a slightly more finished temporary look, especially if the board will be up for weeks, you can paint the exterior side of the plywood to match your house color. This won’t improve function, but it can improve curb appearance while you wait for the repair.
Securing Your Peace of Mind
A broken window is a stressful event, but knowing how to respond effectively restores a sense of control. By prioritizing safety, using the right materials, and methodically securing a sturdy board over the opening, you protect your home from secondary damage and security risks. This temporary shield gives you the stability to plan a proper, permanent repair without feeling rushed. Remember, a well-executed board-up is not a sign of damage; it’s a demonstration of preparedness and resilience.
