Page 302 - 2018_IRC

WALL CONSTRUCTION

TABLE R608.3
DIMENSIONAL REQUIREMENTS FOR WALLS a
MAXIMUM
MINIMUM MINIMUM MAXIMUM
WALL TYPE MAXIMUM SPACING OF MINIMUM WEB
WIDTH, W, OF
SPACING OF
AND NOMINAL WALL WEIGHT b VERTICAL CORES THICKNESS, T, OF VERTICAL CORES HORIZONTAL THICKNESS
VERTICAL CORES
THICKNESS (psf) CORES (inches)
(inches) (inches) (inches)
(inches)
4″ Flat c 50 NA NA NA NA NA
6″ Flat c 75 NA NA NA NA NA
8″ Flat c 1 0 0 N A N A N A N A N A
10″ Flat c 1 2 5 N A N A N A N A N A
6″ Waffle-grid 56 8 d 5.5 d 12 16 2
8″ Waffle-grid 76 8 e 8 e 12 16 2
6″ Screen-grid 53 6.25 f 6.25 f 12 12 NA
3
2
4
For SI: 1 inch = 25.4 mm; 1 pound per square foot = 0.0479 kPa, 1 pound per cubic foot = 2402.77 kg/m , 1 square inch = 645.16 mm , 1 inch = 42 cm . 4
NA = Not Applicable.
a. Width “W,” thickness “T,” spacing and web thickness, refer to Figures R608.3(2) and R608.3(3).
b. Wall weight is based on a unit weight of concrete of 150 pcf. For flat walls the weight is based on the nominal thickness. The tabulated values do not include
any allowance for interior and exterior finishes.
1
c. Nominal wall thickness. The actual as-built thickness of a flat wall shall not be more than / inch less or more than / inch more than the nominal dimension
1
4
2
indicated.
d. Vertical core is assumed to be elliptical-shaped. Another shape of core is permitted provided the minimum thickness is 5 inches, the moment of inertia, I,
4
about the centerline of the wall (ignoring the web) is not less than 65 inch , and the area, A, is not less than 31.25 square inches. The width used to calculate A
and I shall not exceed 8 inches.
e. Vertical core is assumed to be circular. Another shape of core is permitted provided the minimum thickness is 7 inches, the moment of inertia, I, about the
4
centerline of the wall (ignoring the web) is not less than 200 inch , and the area, A, is not less than 49 square inches. The width used to calculate A and I shall
not exceed 8 inches.
f. Vertical core is assumed to be circular. Another shape of core is permitted provided the minimum thickness is 5.5 inches, the moment of inertia, I, about the
centerline of the wall is not less than 76 inch , and the area, A, is not less than 30.25 square inches. The width used to calculate A and I shall not exceed 6.25
4
inches.
CONCRETE WALL
THICKNESS

FORM
STAY-IN-PLACE
OR REMOVABLE

CONCRETE

VERTICAL WALL
REINFORCEMENT
AS REQUIRED

PLAN VIEW
SEE TABLE 608.3 FOR MINIMUM DIMENSIONS

FIGURE R608.3(1)
FLAT WALL SYSTEM

2018 INTERNATIONAL RESIDENTIAL CODE ® 277
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