All Fortress High Wind Zipper Tracks are measured the same way no matter what fabric you use.
When measuring the opening for an outside flush/surface mount, just give us your opening dimensions. To allow for the side tracks which are each 2” wide, we will then add 5” to your opening width to make up for any irregularities. The height of the side rails will be from the top of your housing, which is 5 ½” tall to how far down you want the shade to drop. The tracks will be about 2″ longer than needed to allow for any variances. Adjustments will need to be made on site. Continue reading