Wind design is complicated and calculating the correct roof design parameters is challenging.
Uplift characteristics of metal roof.
These two types of metal roofs exposed fastened and standing seam i e.
Panel width and profile metal type and thickness clip type and frequency type and number of fasteners and the roof deck contribute to the uplift resistance of every metal panel roof system.
If you have a vertical column and footing that support only 100 s f i would use c c wind load roof uplift on that column and footing despite the fact that the column receives the wind load through roofing insulation boards screws attaching the boards metal deck joists beams bolts connecting beams etc.
Therefore the entire metal roof can be seen as a rectangular plate with two opposed simply supported edges and two other free opposed edges.
Under the same weather condition a single block of metal roof suffers a wind uplift equivalent to a uniform load.
The control equations can be solved by external constraints and applied loads.
These tests are necessary to understand how a metal roof.
Metal panel roof systems installed over solid substrates with concealed clips or through fastened can be designed using the following test standards.
Methods and accessories to improve wind uplift characteristics for metal roofs.
Concealed fastened have different performance characteristics when exposed to high winds.
Wind uplift ratings wind zones and specific wind uplift requirements.
Because fm approvals requires a 2 1 safety factor roofs with field of roof uplift forces of 30 pounds per square foot are the maximum for 1 60 ratings and 37 5 pounds per square foot are the.
Numerous factors ultimately determine the severity of the suction pressure.
Specific metal roof products panel profiles and applications that perform best for wind uplift.
Let s take a look at how wind uplift from extreme weather affects roofing and examine the engineering behind the superior wind protection of decra metal roofing.
Let s assume that the calculations for our building require a roof that can withstand 23 pounds per square foot of uplift force in the field of the roof.
Current wind uplift tests and how they are performed.
Defining wind uplift wind uplift is created when the air pressure below the roofing system is higher than the air pressure above the roof.
To ensure a correctly built metal roof there are a variety of wind uplift tests manufacturers use to test their metal panel systems.
Metal roof systems in high wind regions april 2009 page 1 of 5 purpose.
To recommend practices for designing and installing metal roof systems that will enhance wind resistance in high wind regions i e greater than 90 miles per hour mph gust design wind speed.
