- 1). Measure the dimensions of the screen that you'll be replacing (height and width), so you'll know what size replacement screen you'll need.
- 2). Remove the screen and its frame from the window or door it's attached to, being careful not to damage the frame. Most screens are held in place with metal pins that slide along a track in the door or window frame, and are mounted in such a way that there's enough "give" in the frame to allow the screen to be removed easily. Place the removed screen flat on the floor or ground, with the inside of the screen frame facing upward.
- 3). Remove the stripping that's found on the inside of the frame around the old screen. If you pry up one of the ends (usually found in a corner of the frame), you can remove it easily by gently pulling it up all the way around the screen. Place the strip aside for later use.
- 4). Remove the old, damaged screen. The screen should lift off the frame in one large sheet, but you may find bits of screen left in the stripping track afterward, especially with older screens. Scrape out any bits of screen left in the stripping track with the point of your flat-head screwdriver.
- 5). Lay the replacement screen mesh over the frame, ensuring that there's a margin of screen mesh left over on each side of the frame. The screen mesh should be as flat as possible to ensure a clean appearance and secure fit, so smooth out any kinks, bumps or bends in the screen.
- 6). Bend the wire mesh down into the stripping track, using the flat-head screwdriver or a screen roller. Be careful not push down directly onto the screen, or it will likely tear at the point of the screwdriver. Instead, align the screwdriver tip (or screen roller tool) with the top of the track and draw it toward you, bending the mesh into the track as you go.
- 7). Reinsert the stripping around the new screen, taking care to ensure that the stripping is firmly inserted all the way into the track. Your screwdriver will also be handy here for pressing the stripping down into the track. The grooves on the stripping allow it to grip both the screen and the frame, creating a tight lock for the new screen to hang from.
- 8). Trim the excess mesh from around the new screen with scissors, but be careful not to trim it so close to the stripping that you risk creating a weak point along the side. Leaving 1/8 inch or so outside the stripping will guarantee there are no accidents in trimming off too much.
- 9). Reinstall the new screen into your window or door frame, reversing the procedure you used to remove it.
Source...