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Roof Zones

Roof Zones

The roof zone describes the amount of wind load that is subjected to the roof. Interior zones, zone 1, have the lowest load and account for about 80% of the roof surface. End zones, zone 2, have a higher load than zone 1. They represent the perimeter of the roof and account for approximately 15% of the roof surface. Corner zones, zone 3, have the highest load. They are located at the corners of the roof and account for 5% of the roof surface.

The roof zones come into play when designing how a solar system will attach to the roof. If you have a flat roof and are using a ballasted system in which weight holds the array in place a larger amount of ballast is needed in zones 3 then in zones 1. If too little ballast is used the array can flip or move as it is subjected to strong winds.

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