FAQ Knowledge Articles

Vertical mulling: Yes.  Ultimate Gliders can be directly mulled vertically in most cases. Additional reinforcement may be required based on size of windows and job-site design pressure requirements.
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Horizontal mulling:  No.  Horizontal mulling requires a minimum of 1” LVL at the horizontal mull to maintain structural integrity.

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For more information on mulling, see the Architectural Details Manual for Mulls