1) Spline in top of opening and fully attach screen material. Ensure spline if fully seated into spline channel.
2) Spline in lower extrusion. Pull downward tension on screen material while installing spline. This will tighten up the screen panel substantially. Most of your tension will be obtained during this step. Ensure spline if fully seated into spline channel.
3) If you're right-handed, install the spline on the right side next. If you're left-handed, install the spline on the left side next. Ensure spline is fully seated into spline channel.
4) Install spline in final remaining side. Pull lateral tension on the screen while installing spline. This step will tighten up the screen fully and create a clean flat installation. Ensure spline if fully seated into spline channel.
Adjustments for metal materials:
Metal screen materials can be used - but there is always a risk of cathodic reaction when installing into the aluminum extrusion. Screening pattern is the same except that the screen should be fully worked into the extrusion prior to installing spline. This eliminates trimming. To achieve this, overlap the top extrusion by 1/8” to 3/16” with the screen material. Work the screen into the extrusion fully. Angle cut the corners last. Install the spline in one full motion across the top. Repeat steps for bottom extrusion while putting downward tension on the screen. Repeat steps for prime hand side. Repeat for non-prime hand side – again while pulling lateral tension. If performed correctly there should be no trimming and screen should be flat with a clean appearance. Another trick (not required) is to use a step spline tool to form a clean edge prior to installing spline.
This will give a crisp clean edge all around.