2023 Utah Code › Title 15A - State Construction and Fire Codes Act › Chapter 3 - Statewide Amendments Incorporated as Part of State Construction Code › Part 1 - Statewide Amendments to International Building Code › Section 108 - Amendments to Chapters 17 through 19 of IBC.

Effective 7/1/2023
15A-3-108.
Amendments to Chapters 17 through 19 of IBC.
(1) A new IBC, Section 1807.1.6.4, is added as follows: "1807.1.6.4 Empirical concrete foundation design. Group R, Division 3 Occupancies three stories or less in height, and Group U Occupancies, which are constructed in accordance with Section 2308, or with other methods employing repetitive wood-frame construction or repetitive cold-formed steel structural member construction, shall be permitted to have concrete foundations constructed in accordance with Table 1807.1.6.4."
(2) A new IBC, Table 1807.1.6.4 is added as follows:
"TABLE 1807.1.6.4
EMPIRICAL FOUNDATION WALLS (1,7,8)
Max. HeightTop Edge SupportMin.
Thickn essVertic al Steel (2)Horizon tal Steel (3)Steel at
Openings (4)Max. Lintel LengthMin. Lintel Length
2'(610 mm)None6"(5)2- #4 Bars2- #4 Bars above
1- #4 Bar each side
1- #4 Bar below2'(610 mm)2" for each foot of opening width;
min. 6"
3'(914 mm)None6"#4@3 2"3- #4 Bars2- #4 Bars above
1- #4 Bar each side
1- #4 Bar below2'(610 mm)2" for each foot of opening width;
min. 6"
4'(1,219 mm)None6"#4@3 2"4- #4 Bars2- #4 Bars above
1- #4 Bar each side
1- #4 Bar below3'(914 mm)2" for each foot of opening width;
min. 6"
6'(1,829 mm)Floor or roof Diaphra gm (6)8"#4@2 4"5- #4 Bars2- #4 Bars above
1- #4 Bar each side
1- #4 Bar below6'(1,829 mm)2" for each foot of opening width;
min. 6"
8'(2,438 mm)Floor or roof Diaphra gm (6)8"#4@2 4"6- #4 Bars2- #4 Bars above
1- #4 Bar each side
1- #4 Bar below6'(1,829 mm)2" for each foot of opening width;
min. 6"
9'(2,743 mm)Floor or roof Diaphra gm (6)8"#4@1 6"7- #4 Bars2- #4 Bars above
1- #4 Bar each side
1- #4 Bar below6'(1,829 mm)2" for each foot of opening width;
min. 6"
Over 9'(2,743 mm), Engineering required for each column
Footnotes:
(1) Based on 3,000 psi (20.6 Mpa) concrete and 60,000 psi (414 Mpa) reinforcing steel.
(2) To be placed in the center of the wall, and extended from the footing to within three inches (76 mm) of the top of the wall; dowels of #4 bars to match vertical steel placement shall be provided in the footing, extending 24 inches (610 mm) into the foundation wall.
(3) One bar shall be located in the top four inches (102 mm), one bar in the bottom four inches (102 mm) and the other bars equally spaced between. Such bar placement satisfies the requirements of Section 1808.8.6. Corner reinforcing shall be provided so as to lap 24 inches (610 mm).
(4) Bars shall be placed within two inches (51 mm) of the openings and extend 24 inches (610 mm) beyond the edge of the opening; vertical bars may terminate three inches (76 mm) from the top of the concrete.
(5) Dowels of #4 bar at 32 inches on center shall be provided in the footing, extending 18 inches (457 mm) into the foundation wall.
(6) Diaphragm shall conform to the requirements of Section 2308.
(7) Footing shall be a minimum of nine inches thick by 20 inches wide.
(8) Soil backfill shall be soil classification types GW, GP, SW, or SP, per Table 1610.1. Soil shall not be submerged or saturated in groundwater."
(3) A new IBC, Section 1905.1.9, is added as follows: "1905.1.9 ACI 318, Section 19.3.1.1." Modify ACI 318, Table 19.3.1.1 to read as follows: In the portion of the table designated as "Conditions", the following Exposure category and class is deleted and replaced with the following:
"F0: Concrete elements not exposed to freezing and thawing cycles including footing elements, such as footings, tie beams, piles, and pile caps, etc., that are completely buried in soil."
Amended by Chapter 209, 2023 General Session