Page 305 - 2018_IRC

WALL CONSTRUCTION

cement and foam insulation, a composite of cement and will not occur during the concrete placement operation.
wood chips, or other approved material suitable for sup- Steel reinforcement in concrete cast against the earth
porting and containing concrete. Forms shall provide suf- shall have a minimum cover of 3 inches (76 mm). Min-
ficient strength to contain concrete during the concrete imum cover for reinforcement in concrete cast in
placement operation. removable forms that will be exposed to the earth or
1
Form ties shall be steel, solid plastic, foam plastic, a weather shall be 1 / inches (38 mm) for No. 5 bars and
2
composite of cement and wood chips, a composite of smaller, and 2 inches (50 mm) for No. 6 bars and
cement and foam plastic, or other suitable material capable larger. For concrete cast in removable forms that will
of resisting the forces created by fluid pressure of fresh not be exposed to the earth or weather, and for concrete
3
concrete. cast in stay-in-place forms, minimum cover shall be / 4
inch (19 mm). The minus tolerance for cover shall not
R608.5.4 Reinforcement installation details. exceed the smaller of one-third the required cover and
R608.5.4.1 Support and cover. Reinforcement shall 3 / inch (10 mm). See Section R608.5.4.4 for cover
8
be secured in the proper location in the forms with tie requirements for hooks of bars developed in tension.
wire or other bar support system such that displacement
TABLE R608.5.4(1)
LAP SPLICE AND TENSION DEVELOPMENT LENGTHS
YIELD STRENGTH OF STEEL, f y - psi (MPa)
BAR SIZE 40,000 (280) 60,000 (420)

NO.
Splice length or tension development length
(inches)
4 2 0 3 0
Lap splice length-tension 5 2 5 3 8
6 3 0 4 5
4 1 5 2 3
Tension development length for straight bar 5 1 9 2 8
6 2 3 3 4
Tension development length for: 4 6 9
1
a.90-degree and 180-degree standard hooks with not less than 2 / inches
2
of side cover perpendicular to plane of hook, and 5 7 1 1
b.90-degree standard hooks with not less than 2 inches of cover on the bar
extension beyond the hook. 6 8 1 3
4 8 1 2
Tension development length for bar with 90-degree or 180-degree standard
hook having less cover than required in Items a and b. 5 1 0 1 5
6 1 2 1 8
For SI: 1 inch = 25.4 mm, 1 degree = 0.0175 rad, 1 pound per square inch = 6.895 kPa.

CONCRETE
REINFORCEMENT
AS REQUIRED

GAP SHALL NOT EXCEED
1
THE SMALLER OF / 5
LAP LENGTH AND 6 IN.
d b
REINFORCEMENT
AS REQUIRED

LAP SPLICE LENGTH-
SEE TABLE R608.5.4(1)
NOTE: BARS ARE PERMITTED
TO BE IN CONTACT WITH
EACH OTHER
For SI: 1 inch = 25.4 mm.
FIGURE R608.5.4(1)
LAP SPLICES

280 2018 INTERNATIONAL RESIDENTIAL CODE ®
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