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// CODE SNIPPET

R404.1.3.2 Reinforcement for Foundation Walls

Residential Code 2021 of Colorado > 4 Foundations > R404 Foundation and Retaining Walls > R404.1 Concrete and Masonry Foundation Walls > R404.1.3 Concrete Foundation Walls > R404.1.3.2 Reinforcement for Foundation Walls
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Concrete foundation walls shall be laterally supported at the top and bottom. Horizontal reinforcement shall be provided in accordance with Table R404.1.2(1). Vertical reinforcement shall be provided in accordance with Table R404.1.2(2), R404.1.2(3), R404.1.2(4), R404.1.2(5), R404.1.2(6), R404.1.2(7) or R404.1.2(8). Vertical reinforcement for flat basement walls retaining 4 feet (1219 mm) or more of unbalanced backfill is permitted to be determined in accordance with Table R404.1.2(9). For basement walls supporting above-grade concrete walls, vertical reinforcement shall be the greater of that required by Tables R404.1.2(2) through R404.1.2(8) or by Section R608.6 for the above-grade wall. In buildings assigned to Seismic Design Category D0, D1 or D2, concrete foundation walls shall also comply with Section R404.1.4.2.

R404.1.3.2.1 Concrete Foundation Stem Walls Supporting Above-Grade Concrete Walls

Foundation stem walls that support above-grade concrete walls shall be designed and constructed in accordance with this section.
  1. Stem walls not laterally supported at top. Concrete stem walls that are not monolithic with slabs-on-ground or are not otherwise laterally supported by slabs-on-ground shall comply with this section. Where unbalanced backfill retained by the stem wall is less than or equal to 18 inches (457 mm), the stem wall and above-grade wall it supports shall be provided with vertical reinforcement in accordance with Section R608.6 and Table R608.6(1), R608.6(2) or R608.6(3) for above-grade walls. Where unbalanced backfill retained by the stem wall is greater than 18 inches (457 mm), the stem wall and above-grade wall it supports shall be provided with vertical reinforcement in accordance with Section R608.6 and Table R608.6(1).
  2. Stem walls laterally supported at top. Concrete stem walls that are monolithic with slabs-on-ground or are otherwise laterally supported by slabs-on-ground shall be vertically reinforced in accordance with Section R608.6 and Table R608.6(1), R608.6(2) or R608.6(3) for above-grade walls. Where the unbalanced backfill retained by the stem wall is greater than 18 inches (457 mm), the connection between the stem wall and the slab-on-ground, and the portion of the slab-on-ground providing lateral support for the wall shall be designed in accordance with PCA 100 or with accepted engineering practice. Where the unbalanced backfill retained by the stem wall is greater than 18 inches (457 mm), the minimum nominal thickness of the wall shall be 6 inches (152 mm).

R404.1.3.2.2 Concrete Foundation Stem Walls Supporting Light-Frame Above-Grade Walls

Concrete foundation stem walls that support light-frame above-grade walls shall be designed and constructed in accordance with this section.
  1. Stem walls not laterally supported at top. Concrete stem walls that are not monolithic with slabs-on-ground or are not otherwise laterally supported by slabs-on-ground and retain 48 inches (1219 mm) or less of unbalanced fill, measured from the top of the wall, shall be constructed in accordance with Section R404.1.3. Foundation stem walls that retain more than 48 inches (1219 mm) of unbalanced fill, measured from the top of the wall, shall be designed in accordance with Sections R404.1.1 and R404.4.
  2. Stem walls laterally supported at top. Concrete stem walls that are monolithic with slabs-on-ground or are otherwise laterally supported by slabs-on-ground shall be constructed in accordance with Section R404.1.3. Where the unbalanced backfill retained by the stem wall is greater than 48 inches (1219 mm), the connection between the stem wall and the slab-on-ground, and the portion of the slab-on-ground providing lateral support for the wall, shall be designed in accordance with PCA 100 or in accordance with accepted engineering practice.

Related Code Sections


R404.1.3.2 Foundations, Reinforcement for Foundation Walls
Concrete foundation walls shall be laterally supported at the top and bottom. Horizontal reinforcement shall be provided in accordance with Table ...
Residential Code 2021 of Colorado > 4 Foundations > R404 Foundation and Retaining Walls > R404.1 Concrete and Masonry Foundation Walls > R404.1.3 Concrete Foundation Walls > R404.1.3.2 Reinforcement for Foundation Walls
R608.5.4.2 Wall Construction, Location of Reinforcement in Walls
For location of reinforcement in foundation walls and above-grade walls, see Sections R404.1.3.3.7.2 and R608.6.5, respectively ...
Residential Code 2021 of Colorado > 6 Wall Construction > R608 Exterior Concrete Wall Construction > R608.5 Materials > R608.5.4 Reinforcement Installation Details > R608.5.4.2 Location of Reinforcement in Walls
1807.1.6.3.1 Soils and Foundations, Alternative Foundation Wall Reinforcement
In lieu of the reinforcement provisions for masonry foundation walls in Table 1807.1.6.3(2), 1807.1.6.3(3) or 1807.1.6.3(4), alternative reinforcing ...
Building Code of the Department of Personnel & Administration/Office of the State Architect (DPA/OSA) > 18 Soils and Foundations > 1807 Foundation Walls, Retaining Walls and Embedded Posts and Poles > 1807.1 Foundation Walls > 1807.1.6 Prescriptive Design of Concrete and Masonry Foundation Walls > 1807.1.6.3 Masonry Foundation Walls > 1807.1.6.3.1 Alternative Foundation Wall Reinforcement
1807.1.6.3.1 Soils and Foundations, Alternative Foundation Wall Reinforcement
In lieu of the reinforcement provisions for masonry foundation walls in Table 1807.1.6.3(2), 1807.1.6.3(3) or 1807.1.6.3(4), alternative reinforcing ...
Building Code of the Department of Personnel & Administration/Office of the State Architect (DPA/OSA) > 18 Soils and Foundations > 1807 Foundation Walls, Retaining Walls and Embedded Posts and Poles > 1807.1 Foundation Walls > 1807.1.6 Prescriptive Design of Concrete and Masonry Foundation Walls > 1807.1.6.3 Masonry Foundation Walls > 1807.1.6.3.1 Alternative Foundation Wall Reinforcement
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