This is an Archive of the ASCE7-05 Windload Program for Wall Components and Cladding
The program is officially decommissioned and removed December 2025. Please go to the newer codes: ASCE 7-22 Wind Load calculator.
.
.
To get started select and enter your project information.
A note about the Kzt factor: Kzt is a topographic effect factor to account for speed up over hills. Since I reside in Florida I use Kzt equals one and established that as the default value. Refer to your states Kzt values and adjust the value as required. I found a paper from the Florida International University stating few places in the state of Florida would warrant an escarpment factor greater than 1.0, therefore Kzt is unnecessary in the current endeavor. I found a great site showing the Kzt factors for Seattle, Washington from the Department of Planning and Development, their values range from 1.12 to 2. Refer to the links page for information.
A note about the Kd factor: Kd is a directionality factor. Over the years the Kd factor value has stirred up some controversy as to whether the value is 0.85 or should be one. I have set the default value to 0.85; if you are uncertain what value to use change the value to one for a worst case scenario. I found a good reference to this question at Engineering Express to support the Kd factor equals 0.85. Refer to the links page for information.
Please take a look at the MetalOpt.com material optimizer.