In Tornado Alley, They Put the Plywood and Shingles on the Wrong Side of the Rafters

High velocity winds take roofs off houses and houses off the ground. The bernoulli effect causes a low pressure on the roof and the upward force on the roof is due to the higher air pressure of the still air on the underside of the roof. The bernoulli effect can be essentially eliminated by preventing air flow along the roof. This in turn can be accomplished by putting the rafters with cross-blocks on top of the roof.

The shingles under the rafters would be fastened first, then the plywood, both from below and then the rest of the shingles from above. The house would have a different look, but high winds would not lift the roof off the house or the house off the ground.

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