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Roofs are attached to homes based on gravitation. In other words, the roof is simply nailed on to the walls of the house relying on the weight of the roof to keep it from moving.
However during a wind storm, the wind creates uplift
which the roof wasn't designed to sustain.
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We have highlighted the nails in green so you can see how typical roofs are attached. Please click on the diagram for a larger photo if the photo above is too small to see the nails.
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