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What Materials Are Used in Emergency Board-Up After Damage?

Last updated October 26, 2026

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The short answer

Plywood Panels

The primary material is exterior-grade plywood, usually 5/8-inch thick. This thickness resists wind and impact better than thinner panels. The plywood is cut to fit each window or door opening, with a slight overlap so it covers the frame completely. Exterior-grade means the glue and wood layers hold up to moisture.

For larger openings, such as sliding glass doors, thicker plywood or multiple layers may be used. The pros measure each opening carefully to ensure a snug fit. A tight fit prevents water from seeping around the edges and keeps debris out. If you live in Port St. Lucie, keeping spare plywood on hand can help after a storm.

Framing Lumber

2x4 lumber is often used to build a simple frame around the opening. This frame gives the plywood something solid to attach to, especially if the original window frame is damaged. The lumber is cut to length and screwed together at the corners. This creates a sturdy structure that can withstand pressure from wind or attempted entry.

In some cases, the 2x4s are also used as horizontal braces across the plywood. These braces distribute force across the panel, reducing the chance of it flexing or popping out. The pros may use treated lumber for any part that touches the ground or stays damp. Treated wood resists rot and insects better than untreated.

Fasteners

Galvanized screws or nails are used because they resist rust. In a humid subtropical climate, plain steel fasteners corrode quickly and weaken the hold. Screws are often preferred because they grip tighter and are easier to remove later. Nails can work for temporary fixes but may pull out under stress.

The pros choose fasteners long enough to penetrate the wall framing behind the plywood, not just the sheathing. This gives the board-up a much stronger anchor. They may also use concrete anchors if the opening is in a masonry wall. Using the right fastener matters as much as the panel itself.

  • Galvanized screws resist rust in humid weather
  • Long screws reach wall studs for a secure hold
  • Concrete anchors for masonry walls
  • Nails are a quick option but less reliable
  • Washers can spread the load on thin materials
  • Removable fasteners make later repairs easier

Sealants and Barriers

Heavy-duty plastic sheeting is sometimes placed between the plywood and the opening. This creates a moisture barrier that blocks wind-driven rain. The sheeting is stapled or taped in place before the plywood goes on. It also keeps out dust and small debris while the opening is exposed.

Caulk or foam sealant may be applied around the edges after the board-up is installed. This fills any gaps and stops water from running behind the panels. The pros apply these materials only after the wood is firmly attached. Sealing is not always necessary for a short-term fix, but it helps in heavy rain.

Temporary Hardware

In addition to screws, the pros may use brackets, hinges, or hasps. These allow the board-up to be opened and closed if the opening needs to be accessed. For example, a door may be boarded up with a hinged panel so you can still enter. This is more common in commercial buildings but can be useful at home.

Steel brackets reinforce the corners of the frame. They add strength where the lumber meets, preventing the frame from racking or twisting. If the board-up needs to stay for weeks, these hardware pieces are essential. They also make removal easier because the whole assembly can be taken apart without damaging the wall.

  • Hinges allow a door to remain usable
  • Hasps let you secure the panel with a padlock
  • Corner brackets strengthen the frame
  • Shims help level the panel on uneven surfaces
  • Plywood clips attach panels without damaging the frame
  • Expansion bolts adjust for tight fits

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Frequently asked questions

How long can a board-up stay in place?

A board-up can stay for weeks or even months, depending on the weather and the extent of damage. The pros use treated wood and sealed edges to extend its life. However, the longer it stays, the more likely moisture will cause issues. Permanent repairs should happen as soon as possible.

Can I board up my own windows with plywood?

Yes, you can do a temporary board-up yourself. You need exterior-grade plywood, 2x4s, and galvanized screws. Measure the opening and add a few inches of overlap. Secure the panel to the wall framing, not just the window trim. For large or high openings, consider calling the pros for safety.

What if the opening is too large for one sheet of plywood?

For large openings, the pros use multiple sheets of plywood with a vertical seam. The seam is backed by a 2x4 to keep the panels from bending. They also add horizontal braces across the full width. This creates a continuous barrier that is nearly as strong as a single sheet.

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