Florida Keys specifics · Highest Wind, Lower Tier
Florida's Hardest Wind Figures, Outside Florida's Strictest Regime
The High Velocity Hurricane Zone covers Miami-Dade and Broward. Monroe County is not in it, and carries higher design wind speeds than either. The strictest test protocol does not apply where the numbers are hardest.
Give us the mile marker and tell us whether the living floor is up on piers. Those two answers shape the job more than the window does.
Highest
Monroe carries the highest design wind speeds in Florida
Not HVHZ
And it is governed by statewide approval, not a Miami-Dade NOA
One road
Everything arrives down US-1. We plan the job around that
Licensed
A licensed Florida general contractor
Reading the label instead of the calculation
Everywhere else in Florida the approval label is a reasonable shorthand. A Miami-Dade acceptance means the strictest protocol; statewide approval means the standard one. Here that shorthand breaks, because the county with the highest calculated pressures in the state works from the statewide field. A buyer who reasons from the label concludes that the Keys are a softer market than Miami. The wind figures say the opposite, and the only thing that resolves it is the number calculated for the specific opening.
What follows from that, practically
- Statewide Florida Product Approval governs here, not a Miami-Dade NOA.
- The calculated design pressures are the highest in the state.
- A wide statewide field means many products that do not meet them.
- An HVHZ-tested product is legal here and often the sensible buy.
- The verification burden sits entirely on the calculation.
Why the boundary sits where it does
The High Velocity Hurricane Zone was written into the code after Hurricane Andrew and drawn by county boundary around the area that storm devastated. It is a regulatory line rather than a meteorological one, which is a point our Palm Beach site makes about the northern edge of the zone.
Monroe County sits immediately beyond the southern edge of it and carries the highest design wind speeds in Florida. It is the clearest illustration available that the zone describes a piece of regulatory history rather than a ranking of risk.
How we handle it
- 01Calculate pressure per opening before any product is selected.
- 02Name the approval, and confirm it holds at the actual size.
- 03Recommend HVHZ-tested product where the numbers point that way.
- 04Show the working rather than asking you to take it on trust.
On our Palm Beach site we argue that buyers are routinely oversold Miami-Dade product they do not need. That argument is correct there and it does not travel here. It is the same principle producing a different answer: specify to the calculation. In Palm Beach the calculation usually says you are paying for a protocol you do not require. In Monroe County it frequently says the opposite.
Said plainly
Where we stop
Nothing here suggests Monroe County is under-regulated or that its buildings are less safe. Design pressures follow the wind speeds, so the requirements your openings must satisfy are higher than in Miami. What differs is the testing protocol behind the approvals, and therefore where the checking has to happen.
FAQ
Common questions
- Is the Keys building code weaker than Miami's?
- The testing protocol behind product approval is less onerous, and the design pressures your openings have to meet are higher. Those are two different things and only the first is what people mean when they say the code is weaker.
- Should I just buy Miami-Dade approved product to be safe?
- It is a defensible default here in a way it is not further north, and it is still worth seeing the calculation. Buying to a number you have been shown beats buying to a label, even when the label happens to be the right choice.
- What figure applies to my house?
- It is calculated from your location, exposure, building height and the position of each opening. There is no single number for the county, and any quote offering one has not done the work.
What we install
Impact Windows
The main event. Monroe carries the state's highest design wind speeds while sitting outside the stricter approval regime, so every bit of the weight lands on getting the calculation right.
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Sliding Glass Doors
Keys sliders tend to be wide, they face open water, and on a great many houses they open onto a deck a full story above the ground. Every one of those raises the number the unit has to hold.
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Impact Entry Doors
An approved entry door is one assembly — slab, frame, hinges, lock, threshold and glazing approved together. In Monroe County the part that fails first is almost never the part that was chosen carefully.
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Impact Garage Doors
A double garage door is the largest opening in most houses. In the Keys it frequently sits at the ground level of an elevated structure, which changes what it is doing and what rules apply to it.
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French & Specialty Shapes
Shaped and oversized units are fabricated for one opening in one house. In Monroe County they also have to travel the length of the Overseas Highway, which removes the tolerance for getting anything wrong.
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Glazing Into Existing Frames
Where frames are sound and an approval exists, changing only the glass is cheaper and far less disruptive. In Monroe County it is also the option most often ruled out, and for a reason worth understanding.
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More florida keys specifics
One Road In
Every material used in Monroe County arrives along one road. There is no second route, no nearby branch to run back to, and no way to absorb a mistake by sending somebody tomorrow.
Read more →
There Is No Inland
In every other Florida market a buyer can move inland and pay less. In Monroe County that option does not exist. Every property is coastal, so the specification decisions that are optional elsewhere are not optional here.
Read more →
Up on Piers
A great deal of Keys housing has its living floor raised on piers or columns. That raises height above grade, which raises the calculated pressure, and it turns straightforward access into a planning problem.
Read more →
Next step
Find out what is actually wrong with it.
An inspection, photographs of what we found, and a written scope. If the honest answer is that it can wait another season, that is the answer you will get.