Oklahoma Administrative Code
Title 748 - Oklahoma Uniform Building Code Commission
Chapter 20 - Adopted Codes
Subchapter 6 - IRC[®] 2018
Section 748:20-6-9 - IRC[®] 2018 Chapter 4 Foundations

Universal Citation: OK Admin Code 748:20-6-9

Current through Vol. 41, No. 13, March 15, 2024

Chapter 4 of the IRC® 2018 is adopted with the following modifications:

(1) Section R402.2 Concrete. This section has been modified to include an exception for interior concrete slabs on grade and enclosed garage slabs to the requirement the concrete be air entrained. This section has been modified to read: R402.2 Concrete. Concrete shall have a minimum specified compressive strength of f 'c, as shown in Table R402.2. Concrete subject to moderate or severe weathering as indicated in Table R301.2(1) shall be air entrained as specified in Table R402.2. 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 the cementitious materials specified in Section 19.3.3.4 of ACI 318. Materials used to produce concrete testing thereof shall comply with the applicable standards listed in Chapters 19 and 20 of ACI 318 or ACI 332. Exception: Interior concrete slabs on grade and enclosed garage slabs are not required to be air-entrained.

(2) Table R403.1(1) Minimum width and thickness for concrete footings for light-frame construction (inches) with a superscript "a" and "b" to indicate footnotes "a" and "b" are applicable. This table has been modified to strike footnote "b" from the table title and from underneath the table. No other modifications were made to the table. The table title has been modified to read: Table R403.1(1) Minimum width and thickness for concrete footings for light-frame construction (inches) with a superscript "a" to indicate footnote "a" applies. The footnote at the bottom of the table has been amended to read: "a. Interpolation allowed. Extrapolation is not allowed."

(3) Table R403.1(2) Minimum width and thickness for concrete footings for light-frame construction with brick veneer (inches) with a superscript "a" and "b" to indicate footnotes "a" and "b" are applicable. This table has been modified to strike footnote "b" from the title and from underneath the table. No other modifications were made to the table. The table title has been modified to read: Table R403.1(2) Minimum width and thickness for No other modifications were made to the table. concert footings for light-frame construction with brick veneer (inches) with a super script "a" to indicate footnote "a" applies. The footnote at the bottom of the table has been amended to read: "a. Interpolation allowed. Extrapolation is not allowed."

(4) Table R403.1(3) Minimum width and thickness for concrete footings with cast-in-place concrete or fully grouted masonry wall construction (inches) with a superscript "a" and "b" to indicate footnotes "a" and "b" are applicable. This table has been modified to strike footnote "b" from the title and from underneath the table. No other modifications to the table were made. The table title has been modified to read: Table R403.1(3) Minimum width and thickness for concrete footings with cast-in-place concrete or fully grouted masonry wall construction (inches) with a superscript "a" to indicate footnote "a" applies. The footnote at the bottom of the table has been amended to read: "a. Interpolation allowed. Extrapolation is not allowed."

(5) Section R403.1. General. This section has been modified to provide language specifying rebar reinforcement requirements in concrete footings. This section has been modified to read: R403.1 General. All exterior walls shall be supported on continuous solid or fully grouted masonry or concrete footings, crushed stone footings, wood foundations, or other approved structural system that 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 by the character of the soil. Footings shall be supported on undisturbed natural soils or engineered fill. Concrete footings shall be designed and constructed in accordance with the provisions of Section R403 or in accordance with ACI 332. Concrete footings shall meet the following requirements:

(A) Item 1. Add 2 number four (4) rebar to all footings.

(B) Item 2. All cold joints between footings and foundation walls (stem walls) shall be tied together by a number four (4) rebar at every corner not to exceed 6 feet (1828 mm) o.c. with embedment of 12 inches (304 mm) into each footing and wall.

(6) Section R403.1.6 Foundation anchorage. This section has been modified to specify hand driven cut and concrete nails are not an approved fastener and include an exception for wood sole plates of braced wall panels anchorage under specific criteria. This section has been modified to read:

(A) R403.1.6 Foundation anchorage: Wood sill plates and wood walls supported directly on continuous foundations shall be anchored to the foundation in accordance with this section.

(B) Cold-formed steel framing shall be anchored directly to the foundation or fastened to wood sill plates anchored to the foundation. Anchorage of cold-formed steel framing shall be in accordance with Section R505.3.1 or R603.3.1, as applicable. Wood sill plates supporting cold-formed steel framing shall be anchored to the foundation in accordance with this section.

(C) Wood sole plates at the exterior walls on monolithic slabs, wood sole plates of braced wall panels at building interiors on monolithic slabs and all wood sill plates shall be anchored to the foundation with minimum 1/2-inch-diameter (12.7 mm) anchor bolts spaced not greater than 6 feet (1829 mm) on center or approved anchors or anchor straps spaced as required to provide equivalent anchorage to 1/2-inch-diameter (12.7 mm) anchor bolts. Bolts shall extend not less than 7 inches (178 mm) into concrete or grouted cells of concrete masonry units. The bolts shall be located in the middle third of the width of the plate. A nut and washer shall be tightened on each anchor bolt. There shall not be fewer than two bolts per plate section with one bolt located not more than 12 inches (305 mm) or less than seven bolt diameters from each end of the plate section. Interior load bearing wall sole plates that are not part of a braced wall panel shall be positively anchored with approved fasteners. Hand driven cut or concrete nails are not approved fasteners. Sill plates and sole plates shall be protected against decay and termites where required by Section R317 and R318. Exceptions:
(i) Exception 1. Walls 24 inches (610 mm) total length or shorter connecting offset braced wall panels shall be anchored to the foundation with not less than one anchor bolt located in the center third of the plate section and shall be attached to adjacent braced wall panels at corners as shown in Item 9 of Table R602.3(1).

(ii) Exception 2. Connection of walls 12 inches (305 mm) total length or shorter connecting offset braced wall panels to the foundation without anchor bolts shall be permitted. The wall shall be attached at corners as shown in Item 9 of Table R602.3(1).

(iii) Exception 3. Wood sole plates of braced wall panels at building interiors on monolithic slabs may be anchored using connector(s) with a shear capacity of 2300 pounds and a tensile capacity of 800 pounds over a maximum span of 6 feet.

(7) Section R403.1.7.3 Foundation Elevation. This section has been stricken from the code.

(8) Section R403.1.9. Protection of footings. This section has been added to provide protection to footings when trenching work is needed. This section has been added to read: R403.1.9. Protection of footings. Trenching for work including but not limited to plumbing, electrical, storm shelters, and pools shall comply with this section. Trenching installed parallel to footings and walls shall not extend into the bearing plane of a footing wall. The upper boundary of the bearing plane is a line that extends downward, at an angle of 45 degrees from horizontal, from the outside bottom edge of the footing wall.

Disclaimer: These regulations may not be the most recent version. Oklahoma may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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