The Basic Steps to Replace Your Screen
Replacing a window screen takes about 30 minutes and requires only a flathead screwdriver, a spline roller tool, and new screening material. The process is the same whether your frame is aluminum or wood: you remove the spline (the rubber cord holding the mesh in place), pull out the old screen, lay new mesh over the frame, and press the spline back down to trap the new mesh.
Most hardware stores sell screen repair kits that include a spline roller and a small amount of screening material. If your frame is damaged or bent, replacement is easier than repair, but the mesh itself is inexpensive and the work is straightforward enough that you do not need special skills or experience.
Key Takeaways
- Remove the spline (rubber cord) with a flathead screwdriver, then pull out the old mesh and clean the groove where it sat.
- Lay new screening material over the frame, cut it roughly to size, and use a spline roller tool to press the spline back into the groove, trapping the mesh as you go.
- Trim the excess mesh with a utility knife after the spline is fully seated, working from the outside of the frame.
- A spline roller tool costs $5 to $15 and makes the job much faster than trying to press the spline by hand.
What You Need Before You Start
Gather a flathead screwdriver (any size that fits the spline groove), a spline roller tool, new screening material, and a utility knife. The spline roller is a small plastic tool with a wheel on each end—one wheel is rounded and one is concave. You can buy a basic kit at any hardware store for under $20, and it will last through many screens.
Measure your frame before you buy screening material. Standard mesh comes in rolls and is sold by the foot or in pre-cut sheets. Aluminum screening is the most common and costs less than fiberglass, but fiberglass is easier to work with if you are doing this for the first time because it is more forgiving when you stretch it. Buy material that is slightly larger than your frame opening—you will trim the excess after the spline is seated.
Removing the Old Spline and Mesh
Lay the screen frame flat on a work surface with the mesh side facing up. Insert the flathead screwdriver under the spline at a corner and gently pry it up. The spline should come free in one piece if you work slowly and do not dig the screwdriver into the groove itself. Once you have lifted one section, you can usually pull the rest of the spline out by hand.
With the spline removed, pull the old mesh away from the frame. Clean out the spline groove with the screwdriver or a small brush to remove any debris, old mesh fibers, or dried rubber. A clean groove makes it much easier to seat the new spline evenly. If the groove is cracked or the frame is bent, this is the time to decide whether to repair or replace the frame itself.
Laying and Securing the New Mesh
Place the new screening material over the frame so it covers the entire opening with 2 to 3 inches of excess on all sides. You do not need to stretch it tight at this stage—just lay it flat and smooth out any wrinkles by hand. If you are using fiberglass mesh, it will naturally want to stay in place; aluminum mesh may shift slightly, which is normal.
Insert the spline back into the groove using the spline roller tool. Start at one corner and work along one side, pressing the rounded wheel of the roller down firmly as you move along the groove. The spline will sink into the groove and trap the mesh underneath. Work slowly and keep the spline centered in the groove so it seats evenly. When you reach a corner, lift the roller, reposition it, and continue on the next side.
After you have gone around all four sides, go back and make a second pass with slightly more pressure to may support the spline is fully seated and the mesh is tight. The mesh should be snug but not so tight that it distorts the frame. If you see wrinkles in the mesh after the spline is down, the mesh was not pulled evenly—this is a common first-time mistake, but it does not affect how the screen works.
Trimming the Excess Mesh
Once the spline is fully seated on all four sides, trim the excess mesh with a utility knife. Hold the knife at a shallow angle and cut just outside the spline, working from the outside of the frame. The blade should cut the mesh but not dig into the frame or spline. Work slowly around all four sides and trim the corners at a 45-degree angle so they do not stick up.
If you cut into the spline or frame by accident, do not worry—small nicks do not affect the screen's function. If you cut the mesh too short and it pulls away from the spline, you will need to remove the spline again and re-lay the mesh with more excess material.
Common Mistakes and How to Avoid Them
The most common mistake is pulling the mesh too tight before the spline is fully seated. This causes the mesh to wrinkle or the frame to bow outward. Instead, lay the mesh flat and let the spline do the work of holding it in place. A second common mistake is not cleaning the spline groove before installing the new spline—old debris prevents the new spline from seating evenly and can cause gaps where insects can enter.
Another frequent problem is using a spline that is the wrong size for your frame. Splines come in different diameters (usually 3/16 inch or 1/4 inch). If your new spline is too large, it will not fit in the groove; if it is too small, it will not hold the mesh securely. Bring your old spline to the hardware store and match it by size, or measure the groove width with a ruler.
If the mesh tears while you are working, you can patch it with a small piece of screening material and a dab of clear adhesive, or you can remove the spline and start over with a fresh piece of mesh. Most people find it faster to start over than to patch, especially on the first attempt.
When to Replace the Frame Instead
If the frame itself is bent, cracked, or the spline groove is damaged, replacing just the mesh will not solve the problem. Bent frames do not close properly and leave gaps where insects can enter. Cracked frames can break further when you explore pressure with the spline roller. In these cases, buying a replacement frame is usually cheaper and faster than trying to repair the frame.
Replacement frames come pre-assembled and ready to install in your window. They cost $15 to $40 depending on size and material. If you are replacing the frame, you still need to install new mesh using the same steps described above, unless you buy a frame that comes with mesh already installed.
Frequently Asked Questions
Can I use the same spline for the new mesh?
Yes, if the old spline is not cracked or permanently bent. Spline is made of rubber and can be reused several times. If it is hard, cracked, or does not bend easily, buy new spline—it costs a few dollars and makes the job much easier.
What is the difference between aluminum and fiberglass screening?
Aluminum mesh is thinner, more durable, and less likely to tear, but it is harder to work with because it does not stretch and can kink. Fiberglass mesh is thicker, easier to handle, and more forgiving if you make mistakes, but it tears more easily and does not last as long. For a first-time replacement, fiberglass is the better choice.
How tight should the mesh be?
The mesh should be snug enough that it does not sag or move when you touch it, but not so tight that it distorts the frame or creates visible wrinkles. If the frame bows outward after you finish, the mesh is too tight and you should remove the spline and re-lay the mesh with less tension.
Do I need to remove the screen from the window to replace the mesh?
No, you can replace the mesh while the frame is still in the window if there is enough space to work. Laying it flat on a table or workbench is easier and faster, but it is not required. If you work in the window, support the frame so it does not fall.
What if the spline breaks while I am installing it?
Spline can break if it is old, cold, or if you bend it too sharply at a corner. If this happens, remove what you have installed, discard the broken section, and start over with a new piece of spline. You can also splice two pieces of spline together by overlapping them slightly in a corner, though this is not ideal.