Removing The Door(s)
For a sliding door, as most patios have, the instructions for removal are quite simple. Locate the screws at the top and bottom of the screen that control the tension between the rollers for the top and bottom track. Loosen all the screws to reduce the tension between the rollers and the tracks. Lift the door up and off the tracks.
Removing the Screen
Laying the screen door on the ground, remove the black rubber (or "spline") that holds the screen to the frame. You will likely need to use a screwdriver to loosen the first bit, but the rest should lift out with gentle pressure. Once the spline has been removed, remove and discard the screen material.
Replacing the Screen
Screen material is purchased in rolls, so identify and purchase the appropriately sized roll for your door. Lay the new screen over your door frame, and replace the spline, beginning at the top, and keeping it stretched as you work, making certain that the spline is set snugly into the groove.
Trimming the Screen
Once you have replaced the spline, you will be left with excess screen at the edges. Using a razor (which allows you a much closer edge than scissors), trim the excess screen as close to the spline as possible.
Reinstalling the Door
Reinstall the door by following the reverse of the removal. Place the door back onto the tracks, and tighten the screws at the top and bottom of the frame to return tension to the rollers.
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