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For installations regulated by the International Residential Code, the support foundation for the fireplace installed on concrete shall consist of a minimum of 6 inches thick reinforced concrete slab. The minimum specified compressive strength of f’c, shall be as required in Table R402.2 of the International Residential Code (IRC). Concrete subject to moderate or severe weathering as indicated in Figure R301.2(3) of the International Residential Code (IRC) shall be air entrained as specified in Table R402.2 of the International Residential Code (IRC). The maximum weight of fly ash, other pozzolans, silica fume, slag or blended cements that is included in concrete mixtures for garage floor slabs and for exterior porches, carport slabs and steps that will be exposed to deicing chemicals shall not exceed the percentages of the total weight of cementitious materials specified in Section 4.2.3 of ACI 318. Materials used to produce concrete and testing thereof shall comply with the applicable standards listed in Chapter 3 of ACI 318.
For installations regulated by the International Building Code (IBC), the support foundation for the fireplace installed on concrete shall consist of a minimum of 6 inches thick reinforced concrete slab. The concrete strength and durability shall comply with Sections 1903, 1904 and 1905 of the International Building Code (IBC).
TABLE R402.2 MINIMUM SPECIFIED COMPRESSIVE STRENGTH OF CONCRETE
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| MINIMUM SPECIFIED COMPRESSIVE STRENGTHa (f’c) |
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| TYPE OR LOCATION OF CONCRETE CONSTRUCTION |
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| Weathering Potentialb |
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| Negligible |
| Moderate |
| Severe |
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| Basement walls, foundations and other concrete not exposed to the weather |
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| 2,500 |
| 2,500 |
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| 2,500c |
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| Basement slabs and interior slabs on grade, except garage floor slabs |
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| 2,500 |
| 2,500 |
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| 2,500c |
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| Basement walls, foundation walls, exterior walls and other vertical concrete |
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| 2,500 |
| 3,000d |
| 3,000d |
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| work exposed to the weather |
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| Porches, carport slabs and steps exposed to the weather, and garage floor slabs |
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| 2,500 |
| 3,000d,e,f |
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| 3,500d,e,f |
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a.Strength at 28 days psi.
b.See Figure R301.2(3) for weathering potential.
c.Concrete in these locations that may be subject to freezing and thawing during construction shall be
d.Concrete shall be
e.See Section R402.2 for maximum cementitious materials content.
f.For garage floors with a steel troweled finish, reduction of the total air content (percent by volume of concrete) to not less than 3 percent is permitted if the specified compressive strength of the concrete is increased to not less than 4,000 psi.