Zone I: LOWEST LOAD - main field of the roof (about 80% of total roof surface)
Zone II: NEXT HIGHER LOAD - area around the perimeter of the roof (about 15% of total roof surface)
Zone III: HIGHEST LOAD - at each corner of the roof (about 5% of total roof surface)

Other roof systems accommodate these various wind load zones by either one or a combination of the following: reduced purlin spacing at higher zone roof areas, thicker panel material in these areas, reduced panel width, or exterior clamps over the panel seams. All of these conventional methods call for increased materials, inconsistent structural spacing, and added complexity during installation.

Our patented roof system accommodates all three roof zones simply and efficiently by executing one of three seaming shapes. Each shape is formed in the field after the roofing panels have been installed, meeting precise roof wind loading requirements for each roof zone without added roofing materials or altering panel/purlin placement.