Replacing screening is a straightforward repair you can do yourself with basic tools and materials

Window and door screening wears out from sun exposure, impact, and age—usually after five to ten years depending on climate and use. When you notice tears, holes, or sagging mesh, you have two options: patch small damage or replace the entire screen frame. Full replacement takes two to three hours for a typical window and costs between $15 and $50 per screen in materials, depending on frame size and mesh type.

You will need a flathead screwdriver, a utility knife, a spline roller tool, screening material, and rubber spline cord—all available at hardware stores. The spline roller is the only specialized tool; it costs $5 to $10, and some hardware stores will rent one or roll the spline for you while you wait.

Key Takeaways

  • Screening material comes in aluminum, fiberglass, or pet-resistant mesh; fiberglass is cheapest and easiest to work with for first-time repairs.
  • The rubber spline cord that holds the mesh in place must match the groove width in your frame, so measure before you buy.
  • Remove the old mesh and spline with a flathead screwdriver, then lay new mesh over the frame, cut it oversized, and press it into the groove with a spline roller.
  • Trim excess mesh with a utility knife after the spline is fully seated, working slowly to avoid cutting into the frame itself.
  • If the frame itself is bent or the groove is damaged, replacement of the entire frame is faster and cheaper than repair.

Choosing the right screening material for your climate

Fiberglass mesh is the most common choice for DIY replacement because it is inexpensive, flexible, and forgiving if you make small mistakes. It costs roughly $10 to $20 per roll and works well in most climates. Aluminum mesh is stiffer, more durable in high-wind areas, and lasts longer, but it is harder to work with and costs $15 to $30 per roll. Pet-resistant mesh (also called pet screen) is thicker and designed to resist claws and teeth; it runs $20 to $40 per roll and requires a slightly heavier spline to seat properly.

If you live in a coastal area with salt spray, aluminum or stainless steel mesh resists corrosion better than fiberglass. In very hot climates, darker mesh absorbs more heat and can make a room warmer; lighter colors reflect more light. For a first replacement, fiberglass is the practical choice—it stretches easily, forgives minor tension mistakes, and you can buy a single roll that will cover multiple screens.

Measuring and buying the correct spline size

The rubber spline cord that holds the mesh in place sits in a groove around the inside edge of your frame. Spline comes in different diameters—typically 3/16 inch, 1/4 inch, or 5/16 inch—and you must match the size of the groove or the mesh will not seat properly. To find your spline size, look at the groove itself: it is a small channel running around the inside perimeter of the frame. You can measure it with a ruler or calipers, or bring the frame to the hardware store and test-fit spline sizes in the groove until one slides in snugly without forcing.

Buy spline in a roll rather than pre-cut lengths; a single roll covers multiple screens and costs $3 to $8. When you buy screening material, purchase enough to cover the frame with 2 to 3 inches of overhang on all sides—you will trim the excess after installation. If your frame is 24 by 36 inches, buy a piece of mesh at least 30 by 42 inches.

Removing the old mesh and spline

Lay the frame flat on a work surface. Use a flathead screwdriver to pry up one end of the old spline cord and pull it out of the groove—it should come free in one continuous piece. If it breaks, use the screwdriver to dig out the remaining pieces. Once the spline is out, the old mesh will come away easily; pull it off and discard it.

Inspect the groove for debris, dried adhesive, or damage. Clean it with a dry cloth or soft brush. If the groove is cracked, dented, or the frame is bent, the frame itself needs replacement rather than just new mesh. A bent frame will not hold tension evenly and the mesh will sag or tear again quickly.

Installing new mesh and pressing in the spline

Lay the new mesh over the frame so it covers the entire opening with 2 to 3 inches of overhang on all sides. The mesh does not need to be perfectly centered at this stage—you will trim it later. Starting at one corner, use the spline roller tool to press the spline cord into the groove, which simultaneously pushes the mesh down into the groove. The spline roller has a concave wheel that fits the groove; roll it firmly and steadily along one side of the frame, keeping light downward pressure.

Work one side at a time: complete one full edge before moving to the next. As you roll, the spline will seat into the groove and the mesh will be pulled tight. If you feel resistance or hear a cracking sound, stop—you may be rolling over a wrinkle in the mesh. Back up, lift the spline slightly, smooth the mesh, and roll again. Once all four sides are complete, the mesh should be evenly tight with no sags or loose areas.

Trimming excess mesh without damaging the frame

After the spline is fully seated, use a utility knife to trim the excess mesh flush with the outside edge of the frame. Hold the knife at a shallow angle—nearly parallel to the frame—and cut slowly. Pressing too hard or holding the knife perpendicular to the frame risks cutting into the frame itself or the spline. A sharp blade is essential; dull blades require more pressure and are more likely to slip.

Work one edge at a time and take your time on corners. If you accidentally cut into the spline or frame, you can patch small cuts in the mesh with a patch kit (available at hardware stores for $3 to $5), but damage to the frame or spline usually means removing and re-doing that edge. Once trimming is complete, reinstall the frame in the window or door and test it for smooth operation.

When to replace the frame instead of just the mesh

If the frame is bent, cracked, or the groove is damaged, replacing just the mesh will not solve the problem. A bent frame will not hold the mesh evenly, and the mesh will sag or tear within months. Replacement frames for standard window sizes cost $20 to $60 and take about 15 minutes to install—usually just removing four screws and sliding the old frame out, then sliding the new one in and re-screwing.

Check the frame for these signs of damage: visible bends or twists, cracks in the aluminum or plastic, a groove that is dented or crumbling, or corners that are not square (test by measuring diagonally—both measurements should be equal). If you see any of these, buy a replacement frame rather than spending time on a mesh-only repair. Replacement frames come pre-assembled and ready to install, so you avoid the spline-rolling step entirely.

Frequently Asked Questions

Can I patch a small tear instead of replacing the whole screen?

Yes, if the tear is smaller than 1 inch. Patch kits include a small piece of matching mesh and adhesive or a self-stick backing. Clean the area around the tear, explore the patch, and press it firmly. Patches work well for small damage but do not last as long as full replacement, and multiple patches on one screen usually means it is time to replace the whole thing.

What if the mesh keeps sagging after I install it?

Sagging usually means the spline was not rolled in firmly enough or the mesh was not pulled tight as you rolled. Remove the spline, pull the mesh tighter, and roll again with more downward pressure. If the frame itself is bent, no amount of tension will keep the mesh tight—the frame needs replacement.

Do I need special tools to do this myself?

A spline roller is the only specialized tool, and it costs $5 to $10. You also need a flathead screwdriver and a utility knife, which most people already have. If you do not want to buy a roller, some hardware stores will rent them for a few dollars, or you can ask the store staff if they will roll the spline for you while you wait.

How long does new screening last?

Fiberglass mesh typically lasts five to ten years depending on sun exposure, climate, and how much the screen gets used. Aluminum and pet-resistant mesh last longer, often ten to fifteen years. Screens in shaded areas or climates with less UV exposure last longer than those in full sun.

Can I use the same frame if I am switching from fiberglass to pet-resistant mesh?

Usually yes, but pet-resistant mesh is thicker and may require a slightly heavier spline to seat properly. Check the groove width and spline size before you buy pet-resistant mesh. If your current spline is too thin, you will need to buy the next size up, which may not fit the groove—in that case, frame replacement is simpler than trying to force a larger spline into a small groove.