Window Screen Repair: When to Patch, Re-Screen, or Replace

Window screen repair comes down to three choices, and the damage usually picks for you. A clean puncture smaller than a quarter takes a patch. A tear, a long slit, or mesh that has gone slack and wavy means re-screening, which is new mesh in the frame you already own. A frame that is bent, cracked at a corner, or racked out of square gets replaced, because new mesh in a crooked frame will never sit flat. Most of the screens coming off Twin Cities houses this month land in that middle group.

Why screens tear

The mesh is the part that ages. Standard screen cloth is woven fiberglass, and sunlight breaks the plastic down slowly, so a screen on a south or west wall goes brittle years before one on the north side of the same house. Brittle mesh does not stretch when something leans on it. It splits. That is why a screen can hang untouched for a decade and then tear the first time somebody sets it down on a gravel driveway.

The rest is what you would guess. A dog or a cat going through a patio screen. Hail and wind driven branches. A storm panel dropped on a corner. And a pressure washer, which is the fastest way there is to blow mesh out of its channel, which is why screens get a soft brush and a garden hose instead.

Winter is the other reason

Screens left up through a Minnesota winter take the worst of it. Snow packs into the mesh and freezes, and every thaw and refreeze after that works on the corners where the frame is joined. By May the mesh reads loose and the frame has often lost its square. Aluminum frames are soft to begin with, and the plastic corner keys inside them give out long before the metal does.

Storage finishes the job. Screens stacked flat with weight on top bow in the middle, and a bowed frame lifts the rubber cord out of its groove, which is what makes mesh go wavy. Standing them on edge against a garage wall costs nothing and prevents most of it. The whole fall routine is here: how to clean and store window screens before winter.

What re-screening actually involves

Re-screening means new cloth in the same frame. The mesh is not glued or clipped in. It is held by a thin rubber cord called spline, pressed into a groove around the inside edge of the frame.

Pry one end of the old spline up with a small screwdriver and pull it out in one piece, then lift the mesh off. Lay the new mesh over the frame with a couple of inches of overhang on every side. Press the spline back into the groove with a spline roller, which is a cheap wheel on a handle, doing one long side first, then the opposite side, then the two ends. Trim the overhang with a utility knife run along the outside of the spline.

Tension is the whole job. Pull the mesh too tight and a thin aluminum frame bows inward and will not drop into the window. Leave it loose and you get ripples that catch the light. The trick is to set the first long side, then put a slight bow in the frame by hand before rolling the opposite side, so it springs back and takes up the slack. Reuse old spline only if it is still soft, since hardened spline cracks while you roll it.

Which mesh to ask for

• Standard fiberglass, usually charcoal. Cheap, easy to roll, nearly invisible from inside. The default for good reason.
• Aluminum. Holds a flat plane better and shrugs off heat, but it dents and it kinks if you handle it wrong.
• Pet mesh. Several times thicker than standard cloth, for the door a dog pushes on. It cuts the view and the airflow noticeably.
• Solar screen. A dense weave that blocks a good share of the afternoon sun on a west facing room. It darkens the window, which people like in July and nobody likes in January.

For most windows around here, standard charcoal fiberglass is the right answer. The other three solve a specific problem.

What we do with screens, and what we do not

Screen cleaning is part of the work. Rebuilding a screen is not. There is no re-meshing service here, so when a screen comes out torn or the mesh has gone brittle, I say so and leave it alone rather than wash it into a bigger hole. A hardware store with a screen counter will re-mesh a panel while you wait, and plenty of people do it at home in an afternoon once they have the roller.

What does get done is the glass, the frames, the sills, the tracks and the screens that are still sound, which is most of them. Exterior glass gets purified water through a water fed pole that reaches up to 40 feet, so upper windows happen from the ground. Window cleaning starts at $99 and the work is backed by the Gleam Guarantee.

Screens off is the one stretch all year when the whole window is exposed, so it is the sensible time to do the glass. I work in St. Paul and the metro around it. You can request a quote or book a free 10-minute consultation.