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Learn why noise transfer between rooms is no longer a problem.



The Mull-It-Over Mullion Trim Cap provides the coordinated transition between interior and exterior systems so they perform to their full potential. Noise transfer between rooms is no longer a problem. Building code requirements, confidentiality, privacy, productivity and HIPAA compliance for buildings with glass facades now have a simple design solution.


  • A standard mullion has an STC rating of 28. If left exposed, sound transfer between rooms will be a problem due to the poor noise deadening performance of the mullion.

  • The Mull-It-Over Mullion Trim Cap increases the STC rating at the mullion to minimize sound flanking.

  • 1-hour and 2-hour fire rated Mullion Trim Cap options.

  • FGI Guidelines for Health Care Construction and International Building Code for Multi-Family Housing have minimum STC requirements for demising walls. When tested as an assembly, minimum code requirements will not be met if a demising wall terminates at an exposed mullion.

  • The Mull-It-Over Mullion Trim Cap is a simple and clean trim detail for the exposed end of a partition wall that allows for differential movement between the partition and glass systems.

  • Easy to install during new construction or added during retrofit to correct existing sound transfer problems or code violations.


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