You can replace the entire window screen if you have time, but until then, this is an easy chore that you can take care of with a pair of scissors and an upholstery needle.
Step 1: You can buy a small piece of screen mesh from the hardware store, or you can salvage mesh from an old window screen if you have one lying around. Best bet: Because screens come in different colors and could be nylon or aluminum, buy a piece of screening that matches yours.
Step 2: Cut a square or rectangular piece from the new screen. It should measure at least an inch longer and wider than the damaged area you’re going to replace. Do not cut the damaged screen; you will cover the tear without removing it.
Step 3: Bend all edges around the cut-out piece of screen so they face the same direction.
Step 4: Pull a long wire from the leftover screening to use as sewing thread, or buy invisible, ultra-strong finishing thread from a sewing store. Thread it through a curved upholstery needle with an extra-wide eye.
Step 5: Lay the patch on top of the tear on the old screen. If you don’t want to remove the screen from the window, tape it into place so it stays still while you stitch the patch over it.
Step 6: Sew the mesh to the original screen by pulling the wire/thread through both screens. Fasten the two screens together as closely and tightly as possible. Tie off the thread with a double knot.
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