Wind Uplift At Parapet Walls On Roofs

Any areas between the wall corners that are not included within zone 5.

Wind uplift at parapet walls on roofs.

Wind damage to buildings is primarily caused by roofing damage under high uplift forces caused by wind action. As wind flows over the building the pressure directly above the surface of the roof decreases. Improves wind uplift resistance wind is a major culprit for roof damages. Parapetitus they have a long history which of course is not always clear that allows me to embellish without threat of peer review reversal.

Roof damage caused by wind occurs when the air pressure below the roofing assembly is greater than the air pressure above the building s roof. The exact height of the parapet is not factored into the roof wind uplift calculations but if the parapet is 3 feet or higher the perimeter values can be used at the corners lowering the uplift requirements for that portion of the roof area. Fire protection as the wall is extended past the roof plane the parapet wall prevents flames from coming up through the exterior. Used for roof overhang area along the perimeter of zone 2.

Parapets are a combination of wall and roof pressures. This zone accounts for about 5 of the roof surface represented the corners of the roof. 1 their major function today aside from confusing architects is to protect the edge of roof assemblies from wind uplift forces. Used for roof overhang area along the perimeter of zone 3.

The parapet walls helps keep the wind resistance from compromising the roof s edge. Parapet walls can serve several purposes. Separation of air flow over the leading edge of building roofs causes the pressure.