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Commercial Windcode Calculator

Design with confidence and compliance. Our user-friendly Commercial WindCode Calculator simplifies complex requirements—from Miami-Dade to IBC—helping you instantly find the correct wind pressure rating. Ensure your door selection and structure are perfectly equipped to meet or exceed local building codes and handle nature's toughest conditions.

Building Information

* Building Length Building Width and Height inputs are interchangeable.
* Building Width Building Width and Height inputs are interchangeable.
* Mean Roof Height

The Mean Roof Height is the average of the roof eave height and the height of the highest point on the roof surface, except the eave height shall be used for roof slopes less than 10 degrees or 2.1:12.

Maximum Calculated Mean Roof Height is 60 feet. Please contact the Engineer of Record for calculations involving building greater than 60 feet.

This calculator uses the equations from ASCE 7 supplements to calculate the Kz values for Exposures C and D (and B for MRH >30). These can be looked up from the tables (available in ASCE 7) and interpolated from those values. The interpolated values are slightly more favorable (ie, slightly lower) that the values from the equations.

Door Information

The calculator uses a reduced effective area for doors over 20’ wide and doors over 10’ tall. Some jurisdictions in south Florida use an even more restrictive definition of effective area. Please seek guidance from your local Authority Having Jurisdiction on oversized doors.

Please be aware that this dimension requires only the opening’s width, not including any overlap of the door over the jamb.

* Door Width
* Door Height
Distance from Building Corner
Optional Information

Calculator values are for preliminary design purposes only. Final responsibility lies with a registered design professional.

The output from the WindCode Calculator (the “output”) provided on this website is approximate in nature, intended for preliminary design purposes only, and dependent on the accuracy of the information you provide. Please note that the local building official is the final determiner of the suitability of an installed garage door and its connections to any particular structure. Clopay Building Products offers no warranty or representation – express or implied – that use of the output will result in approval by the applicable governing building code body. Accordingly, users of any output from this website assume all liability arising from such use.

There are two current methods for calculating wind pressures in the ASCE 7-05,10 &16 standards.

  1. Allowable Strength Design (ASD) - analyzes allowable and actual stress by using safety factors to ensure that loads do not exceed the elastic limit.
  2. Load Resistance Factor Design (LRFD) - Otherwise known as “Strength Approach”, it aims to avoid failure by sufficiently increasing service loads through the application of load factors to obtain the ultimate design load.

The only approved method for testing upward acting doors is the ASD method, as the doors must be cycle tested per ANSI/DASMA 108 & 115.
The output from the WindCode Calculator (the “output”) provided on this website is approximate in nature, intended for preliminary design purposes only, and dependent on the accuracy of the information you provide. Please note that the local building official is the final determiner of the suitability of an installed garage door and its connections to any particular structure. Clopay Building Products offers no warranty or representation – express or implied – that use of the output will result in approval by the applicable governing building code body. Accordingly, users of any output from this website assume all liability arising from such use.