To replace your sliding patio screen door, first, measure the dimensions of your door. Next, you will want to assess your door tracks and ensure they are still in working order. Once you have this information, find the replacement sliding patio screen door you want for your space. If you have selected a fully assembled screen door, align the wheels with the door tracks to ensure your screen door opens and closes easily. For our screen door kits, assemble the screen door and then install it into your space.