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// CODE SNIPPET

722.3.2 Concrete Masonry Walls

Building Code 2015 of Utah > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.3 Concrete Masonry > 722.3.2 Concrete Masonry Walls
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The fire-resistance rating of walls and partitions constructed of concrete masonry units shall be determined from Table 722.3.2. The rating shall be based on the equivalent thickness of the masonry and type of aggregate used.
TABLE 722.3.2
MINIMUM EQUIVALENT THICKNESS (inches) OF BEARING OR NONBEARING CONCRETE MASONRY WALLSa,b,c,d
TYPE OF AGGREGATE FIRE-RESISTANCE RATING (hours)
1/2 3/4 1 11/4 11/2 13/4 2 21/4 21/2 23/4 3 31/4 31/2 33/4 4
Pumice or expanded slag 1.5 1.9 2.1 2.5 2.7 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.5 4.7
Expanded shale, clay or slate 1.8 2.2 2.6 2.9 3.3 3.4 3.6 3.8 4.0 4.2 4.4 4.6 4.8 4.9 5.1
Limestone, cinders or unexpanded slag 1.9 2.3 2.7 3.1 3.4 3.7 4.0 4.3 4.5 4.8 5.0 5.2 5.5 5.7 5.9
Calcareous or siliceous gravel 2.0 2.4 2.8 3.2 3.6 3.9 4.2 4.5 4.8 5.0 5.3 5.5 5.8 6.0 6.2

For SI: 1 inch = 25.4 mm.
  1. Values between those shown in the table can be determined by direct interpolation.
  2. Where combustible members are framed into the wall, the thickness of solid material between the end of each member and the opposite face of the wall, or between members set in from opposite sides, shall be not less than 93 percent of the thickness shown in the table.
  3. Requirements of ASTM C55, ASTM C73, ASTM C90 or ASTM C744 shall apply.
  4. Minimum required equivalent thickness corresponding to the hourly fire-resistance rating for units with a combination of aggregate shall be determined by linear interpolation based on the percent by volume of each aggregate used in manufacture.

722.3.2.1 Finish on Nonfire-Exposed Side

Where plaster or gypsum wallboard is applied to the side of the wall not exposed to fire, the contribution of the finish to the total fire-resistance rating shall be determined as follows: The thickness of gypsum wallboard or plaster shall be corrected by multiplying the actual thickness of the finish by applicable factor determined from Table 722.2.1.4(1). This corrected thickness of finish shall be added to the equivalent thickness of masonry and the fire-resistance rating of the masonry and finish determined from Table 722.3.2.

722.3.2.2 Finish on Fire-Exposed Side

Where plaster or gypsum wallboard is applied to the fire-exposed side of the wall, the contribution of the finish to the total fire-resistance rating shall be determined as follows: The time assigned to the finish as established by Table 722.2.1.4(2) shall be added to the fire-resistance rating determined in Section 722.3.2 for the masonry alone, or in Section 722.3.2.1 for the masonry and finish on the nonfire-exposed side.

722.3.2.3 Nonsymmetrical Assemblies

For a wall having no finish on one side or having different types or thicknesses of finish on each side, the calculation procedures of this section shall be performed twice, assuming either side of the wall to be the fire-exposed side. The fire-resistance rating of the wall shall not exceed the lower of the two values calculated.
Exception: For exterior walls with a fire separation distance greater than 5 feet (1524 mm), the fire shall be assumed to occur on the interior side only.

722.3.2.4 Minimum Concrete Masonry Fire-Resistance Rating

Where the finish applied to a concrete masonry wall contributes to its fire-resistance rating, the masonry alone shall provide not less than one-half the total required fire-resistance rating.

722.3.2.5 Attachment of Finishes

Installation of finishes shall be as follows:
  1. Gypsum wallboard and gypsum lath applied to concrete masonry or concrete walls shall be secured to wood or steel furring members spaced not more than 16 inches (406 mm) on center (o.c.).
  2. Gypsum wallboard shall be installed with the long dimension parallel to the furring members and shall have all joints finished.
  3. Other aspects of the installation of finishes shall comply with the applicable provisions of Chapters 7 and 25.

Related Code Sections


722.3.2 Fire and Smoke Protection Features, Concrete Masonry Walls
The fire-resistance rating of walls and partitions constructed of concrete masonry units shall be determined from Table 722.3.2. The rating shall ...
Building Code 2015 of Utah > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.3 Concrete Masonry > 722.3.2 Concrete Masonry Walls
722.3.2 Fire and Smoke Protection Features, Concrete Masonry Walls
The fire-resistance rating of walls and partitions constructed of concrete masonry units shall be determined from Table 722.3.2. The rating shall ...
Building Code 2018 of Utah > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.3 Concrete Masonry > 722.3.2 Concrete Masonry Walls
403.2.3.3 Special Detailed Requirements Based on Occupancy and Use, Concrete and Masonry Walls
Concrete or masonry walls shall be deemed to satisfy the requirements of Sections 403.2.3.1 and 403.2.3.2 ...
Building Code 2018 of Utah > 4 Special Detailed Requirements Based on Occupancy and Use > 403 High-Rise Buildings > 403.2 Construction > 403.2.3 Structural Integrity of Interior Exit Stairways and Elevator Hoistway Enclosures > 403.2.3.3 Concrete and Masonry Walls
403.2.3.3 Special Detailed Requirements Based on Use and Occupancy, Concrete and Masonry Walls
Concrete or masonry walls shall be deemed to satisfy the requirements of Sections 403.2.3.1 and 403.2.3.2 ...
Building Code 2015 of Utah > 4 Special Detailed Requirements Based on Use and Occupancy > 403 High-Rise Buildings > 403.2 Construction > 403.2.3 Structural Integrity of Interior Exit Stairways and Elevator Hoistway Enclosures > 403.2.3.3 Concrete and Masonry Walls
722.3.2.2 Fire and Smoke Protection Features, Finish on Fire-Exposed Side
Where plaster or gypsum wallboard is applied to the fire-exposed side of the wall, the contribution of the finish to the total fire-resistance ...
Building Code 2015 of Utah > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.3 Concrete Masonry > 722.3.2 Concrete Masonry Walls > 722.3.2.2 Finish on Fire-Exposed Side
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