Window design pressures for new and replacement windows


New building codes change industry:

Growing requirements for new building codes have significantly altered the design pressure ratios of doors and windows required to replace windows, doors and doors. sliding doors. This is especially true in windy areas such as Florida. Design presses are not only a major life-saving problem for the homeowner, but they are essential for any condominium with more than 4 floors. What is the problem? As the elevations of a building increase, the design presses increase dramatically.

In addition to the elevation, the location of the window (opposite corner in the middle of the building) can quadruple the effects of pressure. For safety reasons, all windows and impact doors in these applications must meet the newly updated and improved air, water and structural design performance requirements. Many homeowners' associations (HOAs), property management companies and even replacement window companies are not familiar with old codes let alone new ones. As many people do when something changes, some may consider these new window design replacement pressures to be over-kill, however. In reality, a single shot of flying debris or winds coming even from a modest tropical storm can destroy your windows and compromise the integrity of your home.

Design Pressures:

The easiest way to explain the window design pressure is to wander through downtown Chicago. Imagine yourself walking down a street during a typical Chicago winter day. In just about any street you will encounter a certain amount of wind, but once you turn this corner, gusts of wind can literally knock you off your feet. Tropical storms and hurricanes are no different in their wind gasses greatly exaggerating the wind pressure and its effects on the designs of a building.

Similarly, for high-rise buildings, wind speed and wind pressure are even more pronounced due to surrounding trees, buildings, and elevations of upper floors. Similar to the wind passing over an airplane wing (Bernoulli principle), these natural and artificial structures can generate negative air pressures that can lift or, in this case, suck up the air. windows and doors directly from the wall. Can you imagine what could happen if you were behind a window that is sucked in at 150 mph? In some cases, winds can reach up to 300 mph or more.

Choice of Window and Door Application:

For tall buildings, single sash windows, double sash windows, casement windows , windows and sliding glass doors meet and, in most cases, exceed regional and county design pressure codes. It is important to note that not all windows and doors are equal. Finding a window merchant and an experienced installer in the processing of design presses is essential. A reputable company can explain and help the homeowner to choose the right window and door product for their particular application.

Large Condominiums:

Conformal window manufacturers announced two major changes in design pressure on double hung windows. Approved dimensions of double hung windows now exceed a structural design pressure rating of 40, most of them exceeding a design pressure of 45, and more than 50 design design pressures. These performance improvements were made possible thanks to the modifications made to the tilt latch, which now pulls the leaf even closer to the amount. The end result for you the owner, a window more energy efficient, quieter and more secure.

Windows Impact:

Calculated pressure ratings on approved window lines – including single-hung, double-hung, transom, and window windows – are also increasing. However, about 10% of currently manufactured window and door products have been upgraded to meet increased design pressure ratios. In order to meet these higher design pressure ratios, windows and doors tested were required to meet three (3) sets of specific criteria related to air, water and structural performance.

Air: The glass was supposed to show no trace of air leakage around the band or corner joints when it was installed in a wind tunnel at 25 mi / h.

Water: The unit should withstand eight inches of rain per hour, driven by winds of 55 mph.

Structural: The unit must remain structurally sound under 142 mph of wind pressure.

Finding the Right Company:

Here is where your real job will begin, as you will need a little education. Find a Window Trained and Certified Factory Installation A company that has not only been specially trained on design pressure requirements, but who knows how to install these windows and doors is the key. Many companies say that they can do the job, but few companies know how to do it properly. Design pressure requirements can only be calculated with a Structural Engineering program. You can not just wing it. If the company you work with does not, do yourself a favor, show them the door and keep going.


Source by Zayden Tripoli

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