Page 207 - Masonry and Concrete

Footings, Foundation Walls, Basements, and Slabs

REINFORCED CONCRETE AND MASONRY FOUNDATION WALLS 1
Maximum Vertical Reinforcement
Size and Spacing 2,3 for 8-inch
Nominal Wall Thickness
Soil Classes 4
Maximum
Max. Unbalanced SC, MH,
Wall Backfill GW, GP, SW and GM, GC, SM, ML-CL and
5
Height, ft Height , ft SP SM-SC and ML Inorganic CL
6 5 #4 @ 48″ o.c. #4 @ 48″ o.c. #4 @ 48″ o.c.
6 #4 @ 48″ o.c. #4 @ 40″ o.c. #5 @ 48″ o.c.
7 4 #4 @ 48″ o.c. #4 @ 48″ o.c. #4 @ 48″ o.c.
5 #4 @ 48″ o.c. #4 @ 48″ o.c. #4 @ 40″ o.c.
6 #4 @ 48″ o.c. #5 @ 48″ o.c. #5 @ 40″ o.c.
7 #4 @ 40″ o.c. #5 @ 40″ o.c. #6 @ 48″ o.c.
8 5 #4 @ 48″ o.c. #4 @ 48″ o.c. #4 @ 48″ o.c.
6 #4 @ 48″ o.c. #5 @ 48″ o.c. #5 @ 40″ o.c.
7 #5 @ 48″ o.c. #6 @ 48″ o.c. #6 @ 40″ o.c.
8 #4 @ 40″ o.c. #6 @ 40″ o.c. #6 @ 24″ o.c.
9 5 #4 @ 48″ o.c. #4 @ 48″ o.c. #5 @ 48″ o.c.
6 #4 @ 48″ o.c. #5 @ 48″ o.c. #6 @ 48″ o.c.
7 #5 @ 48″ o.c. #6 @ 48″ o.c. #6 @ 32″ o.c.
8 #5 @ 40″ o.c. #6 @ 32″ o.c. #6 @ 24″ o.c.
9 #6 @ 40″ o.c. #6 @ 24″ o.c. #6 @ 16″ o.c.

NOTES: 1. Mortar shall be Type M or S and masonry shall be laid in running bond.
2. Alternative reinforcing bar sizes and spacings having an equivalent cross-sec-
tional area of reinforcement per lineal foot of wall shall be permitted provided
the spacing of the reinforcement does not exceed 72 in.
3. Vertical reinforcement shall be Grade 60 minimum. The distance from the face
of the soil side of the wall to the center of the vertical reinforcement shall be
at least 5 in.
4. Soil classes are in accordance with Unified Soil Classification System (Figure
6-13).
5. Unbalanced backfill height is the difference in height of the exterior and inte-
rior finish ground levels. Where an interior concrete slab is provided, the
unbalanced backfill height shall be measured from the exterior finish ground
level to the top of the interior concrete slab.
FIGURE 6-15

Minimum code requirements for reinforced concrete and masonry foundation walls. (from Council of American
Building Officials, One and Two-Family Dwelling Code, Falls Church, VA).

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