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Concrete footing shall be designed and constructed in accordance with the provisions of Section R403 or in accordance with ACI 332. Footings shall be supported on undisturbed natural soils or engineered fill. Porches, carport slabs and steps exposed to the weather, and garage floor slabsĪll exterior walls shall be supported on continuous solid or fully grouted masonry or concrete footings, crushed stone footings, wood foundations, or other approved structural systems which shall be of sufficient design to accommodate all loads according to Section R301 and to transmit the resulting loads to the soil within the limitations as determined from the character of the soil.

MINIMUM SPECIFIED COMPRESSIVE STRENGTH a ( f' c)īasement walls, foundations and other concrete not exposed to the weatherīasement slabs and interior slabs on grade, except garage floor slabsīasement walls, foundation walls, exterior walls and other vertical concrete work exposed to the weather TABLE R402.2 MINIMUM SPECIFIED COMPRESSIVE STRENGTH OF CONCRETE TYPE OR LOCATION OF CONCRETE CONSTRUCTION

Materials used to produce concrete and testing thereof shall comply with the applicable standards listed in Chapters 19 and 20 of ACI 318 or ACI 332. 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 19.3.3.4 of ACI 318.

Concrete subject to moderate or severe weathering as indicated in Table R301.2(1) shall be air entrained as specified in Table R402.2. Concrete shall have a minimum specified compressive strength of f ' c, as shown in Table R402.2.

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