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Exposure D: Open Water, Maximum Wind
In the Florida Keys, there is nothing between your building and the open ocean to slow down the wind. Watch how this creates the highest wind pressures in America.
Why the Keys Get Maximum Wind Pressure
Picture yourself standing on a beach in the Florida Keys. Look out at the water - you can see for miles with nothing in the way. Now think about wind traveling across all that open ocean. There are no trees to slow it down. No buildings to break it up. No hills to redirect it.
That is Exposure Category D - the most severe wind exposure in the building code. When wind has nothing to slow it down, it hits your building at full speed from ground level all the way up.
The Numbers Tell the Story
A house in a suburban neighborhood (Exposure B) might see -32 PSF of suction on its walls. The same house in the Keys with Exposure D sees -52 PSF - over 60% more pressure trying to pull the walls outward. Your windows, doors, and roof need to be much stronger to handle this difference.
The wind speed in Monroe County is 180 mph, which is already the highest in Florida. But Exposure D makes it even worse by applying a higher "exposure coefficient" that increases the calculated pressure. This is why buildings in the Keys need impact-rated windows, reinforced roof connections, and stronger wall bracing than almost anywhere else in the country.
If you are building or renovating in the Keys, understanding Exposure D is critical. Most waterfront properties, and many properties up to several blocks inland, will be classified as Exposure D. This affects every single wind pressure calculation for your permit.
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