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Changing your windows ???

MARCH 2021, issue 2



Elite permits window changing
Elite permits window changing


Written by TATIANA gUSt

I happen to live in Florida where we enjoy beautiful beaches and weather, however, a small price that we have to pay is to endure the occasional hurricane. I remember when I moved to Florida in May 2004, my husband told me “don’t worry about the hurricanes, I have been here for over 10 years and not even one has come through the city”.  Lucky me!  That year and the following year we had two major hurricanes which went through our backyard and did significant damage to our property.

Since then, I have witnessed many people protecting their homes by having their windows replaced with impact resistant windows. As a Floridian, I have to say having impact resistant windows are so much better than shutters, mainly because when the storm is coming, you don’t have to do all the preparation and installation, and then deal with removing all of the panels after the storm. You just wait, and wait, and wait.

Elite permits window changing

Going back to the point about the windows, since the risk of winds are higher in the coastal areas, the product used on the coast may have a higher resistance than a product that is used inland. That number is called design pressures; this number provides a value of the pressure that the product (window or door) is capable of resisting when exposed to wind.

 When applying for a permit, it is important to provide the plan reviewer with the pressures that the product can resist, but how can he/she determine that the product will be adequate for the building where it will be installed?  When applying for a permit, you should also include the actual pressures that apply to the building.

Pressure Product   ≥   Actual Pressure

Many people applying for a permit don’t understand that these two pressures must be provided so the plan reviewer can verify that the product being installed exceeds (is greater than) the pressure applied to the building, so the windows are safe for the specific building (in other words, they won’t blow away).

The good thing is that for residential buildings, the pressure can be easily calculated. The building Code provides a table where you can determine the pressures; it takes a little time to understand the table, but most plan reviewers will help you to comply with this part.

If you find our content interesting, please share our blog with others so we spread the knowledge a little bit at the time.

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Exposure represents the adjustments due the characteristics of the terrain surrounding the building.

Exposure B.For buildings with a mean roof height of less than or equal to 30 feet (9144 mm), Exposure B shall apply where the ground surface roughness, as defined by Surface Roughness B, prevails in the upwind direction for a distance of at least 1,500 feet (457 m). For buildings with a mean roof height greater than 30 feet (9144 mm), Exposure B shall apply where Surface Roughness B prevails in the upwind direction for a distance of at least 2,600 feet (792 m) or 20 times the height of the building, whichever is greater.

Exposure C.Exposure C shall apply for all cases where Exposure B or D does not apply.

Exposure D.Exposure D shall apply where the ground surface roughness, as defined by Surface Roughness D, prevails in the upwind direction for a distance of at least 5,000 feet (1524 m) or 20 times the height of the building, whichever is greater. Exposure D shall also apply where the ground surface roughness immediately upwind of the site is B or C, and the site is within a distance of 600 feet (183 m) or 20 times the building height, whichever is greater, from an Exposure D condition as defined in the previous sentence.