Masonry Fire Ratings

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Related External Links

BIA Tech Note 16

NCMA Techical Notes

BIA Tech Note 16b

UL Web Site


Calculated Fire Resistance Ratings for Masonry

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To determine the fire rating of a wall assembly, building officials generally desire to see a UL number for the specific wall section used.  With the wide range of assemblies, aggregates and unit sizes, one does not always find a UL number for the desired wall system.

To see a list of UL Numbers for Masonry - Click here

Most model building codes allow the use of the calculated fire resistance method to determine fire resistance ratings of building elements.  The calculated method allows one to use simple formulas to determine the fire rating of concrete block and multi-wythe, multi material wall sections.  This calculated method becomes a powerful tool for figuring fire ratings of real world wall systems.

We will look at the calculated method in two parts: