Calculate Mullion Sizes & Reactions
Use this tool by PGT Industries to estimate the mullion size needed to join & support 2 windows.
Created for use with Florida Product Approval 261 & NOA 23-0913.05, the mullion sizes are somewhat industry standard & can be used for estimating and pre-design purposes before speaking with a design professional.
What To Do
First, find the design wind pressure for your project using this tool.
Then, along with your design professional, use these results to create a shop drawing plan for building department submittal.
See this article to learn more about wind design and other tools available to you, and this guide to how to create & submit window & door shop drawings for permit
NOTE: This is an external calculator link – The link above is provided as a directory service only.
Use of the tool is at your own risk & is not affiliated in any way with Engineering Express.
We have no interest, receive no commissions, nor have any relationship with the destination website.
This tool is provided as a public service only.