The equivalent thickness of different types of concrete masonry is provided in the following.
Underwriter labatories fire resistance ratings concrete walls.
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Fire resistance rated designs are used to achieve code compliant installations where the building codes require hourly rated designs.
These values are for solid walls or slabs.
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Aci tms 216 1 14 code requirements for determining fire resistance of concrete and masonry construction assemblies lists the minimum equivalent thickness of single layer concrete walls to meet fire resistance ratings ranging from 1 to 4 hours see table on following page.
For finishes on the fire exposed side of the wall a time from table 8 is assigned to the finish.
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The fire resistance rating of reinforced and plain concrete walls floors and roofs depend on equivalent thickness of the element and can be found out using table 3.