What you're actually replacing

A screen replacement means removing the mesh fabric that has torn, sagged, or stopped keeping insects out, and installing new mesh in the same frame. You are not replacing the frame itself — the aluminum or vinyl border stays in place. The mesh is held in by a rubber cord called spline that runs around the perimeter and sits in a groove. Replacing it is a two-hour job for most windows and doors, costs between $10 and $30 in materials per screen, and requires only a flathead screwdriver, a spline roller tool (about $8), and new mesh.

The hardest part is not the work itself but getting the old spline out cleanly. Once that is done, the new mesh goes in faster than you might expect. If your frame is bent, cracked, or the groove is damaged, replacement becomes a different project — you would need a new frame. But if the frame is sound, this is a straightforward repair.

Key Takeaways

  • Remove the screen from the window or door and lay it flat on a work surface before you start.
  • Pry out the old spline with a flathead screwdriver, working slowly around the entire perimeter so the frame does not bend.
  • Cut new mesh slightly larger than the frame opening, lay it over the groove, and use a spline roller tool to press the spline and mesh into the groove together.
  • Trim the excess mesh with a utility knife after the spline is fully seated, working from the outside edge of the spline.
  • Test the mesh for tautness by pressing it gently — it should not sag or move easily, but should not be so tight that it distorts the frame.

Removing the old spline and mesh

Take the screen frame off the window or door first. Most window screens slide up and out of the track, or have small tabs you press to release them. Door screens usually have hinges on one side and a handle or latch on the other. Once it is off, lay the frame flat on a table or workbench with good light.

Use a flathead screwdriver to pry the spline out of the groove that runs around the inside edge of the frame. Start at a corner and work slowly — the spline is rubber and will come out in one piece if you do not rush. Push the screwdriver under the spline at a shallow angle and lift gently. Move a few inches along the groove, then repeat. Once the spline is out, the old mesh will pull away easily. Discard both.

Clean the groove with the screwdriver or a small brush to remove any debris, old rubber bits, or dried adhesive. A clean groove helps the new spline seat properly and keeps the mesh from sagging later.

Measuring and cutting new mesh

Measure the width and height of the frame opening (the space inside the groove, not including the frame itself). Add 2 inches to both dimensions — this extra material gives you something to hold while you work and gets trimmed away at the end. Cut the new mesh to that size using a utility knife or scissors. Fiberglass mesh is easier to cut than aluminum, and both are inexpensive enough that buying a roll is cheaper than buying individual pre-cut pieces.

Lay the new mesh over the frame opening. It should drape loosely over the groove with extra material hanging over all four sides. Do not stretch it yet — that comes after the spline is in place.

Installing the spline and mesh together

A spline roller tool is a small plastic wheel on a handle, designed to press the spline into the groove while holding the mesh in place. You can find one at any hardware store for $5 to $15. It is the only tool that makes this job straightforward; trying to do it with a screwdriver or your fingers will result in wrinkles and uneven tension.

Start at one corner. Press the spline into the groove by rolling the tool along it, moving slowly and steadily. The tool will push both the spline and the mesh down into the groove at the same time. Work along one full side before moving to the next. Keep the mesh roughly centered over the opening as you go — it will shift slightly as you explore pressure, and that is normal.

When you reach a corner, roll the tool right through it without stopping. The spline will bend naturally. Once you have gone all the way around and returned to your starting point, the spline should be fully seated in the groove and the mesh should be held firmly in place.

Trimming excess mesh and checking tension

Use a utility knife to trim the excess mesh. Hold the knife at a shallow angle and cut along the outside edge of the spline, following the groove all the way around. Work slowly — mesh can fray if you cut too aggressively. The goal is to remove the overhang without cutting into the spline itself.

Once the mesh is trimmed, press it gently with your finger at the center of the frame. It should feel taut but not drum-tight. If it sags noticeably or moves easily, the spline was not seated fully. If it is so tight that the frame bends or the mesh distorts, you may have pulled it too hard during installation. Most screens feel right the first time if you work steadily and do not rush the spline installation.

Reinstalling the screen and testing it

Slide the screen back into the window track or rehang it on the door. Open and close the window or door a few times to make sure the screen moves smoothly and the mesh does not catch on anything. Look at the mesh from outside — it should be flat and even, with no wrinkles or sags.

Test the mesh by running your hand over it gently. You should feel resistance but not excessive tension. If you see tears, gaps, or areas where the spline is not fully seated, you can remove the screen and redo those sections without starting over — just pry out the spline in that area, re-lay the mesh, and roll the spline back in.

When to call a professional

If the frame is bent, cracked, or the groove is damaged or missing, screen replacement becomes a frame replacement, which is a different job. If the frame is aluminum and bent, it may be possible to straighten it with a rubber mallet, but if the groove itself is damaged, a new frame is the only fix. A professional can assess this in minutes and order a replacement frame if needed.

If you have tried the replacement and the mesh keeps sagging or the spline keeps popping out, the frame may be warped or the groove may be worn. Again, a new frame is the solution. Most window and door shops can supply a replacement frame and install it for $50 to $150 per screen, depending on size and material.

Frequently Asked Questions

Can I replace just the mesh without touching the spline?

No. The spline holds the mesh in place, so you have to remove it to install new mesh. The good news is that old spline is inexpensive and comes out easily if you work slowly. New spline costs a few dollars and lasts as long as the mesh does.

What is the difference between fiberglass and aluminum mesh?

Fiberglass is softer, easier to cut, and less likely to dent or bend. Aluminum is more durable and resists tearing better, but it is harder to work with and more expensive. For most home windows and doors, fiberglass is the standard choice and works well.

How tight should the mesh be?

Tight enough that it does not sag when you press it gently, but not so tight that it distorts the frame or feels like a drum. If you can see wrinkles or the mesh moves easily, it is too loose. If the frame bends or the mesh looks stretched, it is too tight. Most people get it right on the first try.

What if the spline breaks while I am removing it?

It is fine — spline is rubber and breaks easily. Just remove the pieces and continue. Once the old spline is out, install new spline the same way. You cannot reuse old spline, so breaking it does not cost you anything extra.

Do I need to remove the screen from the window to replace it?

Yes. Trying to replace the mesh while the screen is in the window is difficult and usually results in wrinkles or uneven tension. Remove it, lay it flat on a table, do the work, and reinstall it when you are done.