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Reinforcing Steel Placing Tolerances

 

Placement Tolerance of Reinforcing Bars

 

 
When member depth (or thickness) is 4 in. or less ± 1/4 in.
When member depth (or thickness) is over 4 in. and not over 12 in ± 1/2 in.

When member depth (or thickness) is over 12 in.

± 3/8 in.
 
 

 

Concrete Cover Tolerances, Measure Perpendicular to Concrete Surface

 

 
When member depth (or thickness) is 12 in. or less - 3/8 in.
When member depth (or thickness) is over 12 in - 1/2 in.
 

Reduction in cover shall not exceed 1/3 the specified concrete cover. Reduction in cover to formed soffits shall not exceed 1/4.

 

Clearance Tolerance Between Reinforcing Bars

 

 
On-quarter specified distance not to exceed - 3/4 in.
 

Distance between reinforcement shall not be less than the greater of the bar diameter or 1 in. for unbundled bars. For bundled bars, the distrance between bundles shall not be less than the greater of 1 in. or a bar diameter derived from the equivalent total area of all bars in the bundle. 

 

Spacing Tolerance of Reinforcing Bars

 

 
Except as noted below ± 3 in.
 

Stirrups, the less of ±3 inches or ±1 inch per foot of beam depth. Ties, the lesser of ±3 inches per foot of at least column width. The total number of bars shall not be fewer than that specified. 

 

Location Tolerance of Bends in Bars and End Location Tolerance of Bars

 

 
At discontinuous ends of other corbels and brackets ± 1/2 in.
At discontinuous ends of other elements ± 1 in.
All other locations ± 2 in.
 

 

Embedment Length Tolerance of Bars and Length Tolerance of Bar Laps

 

 
#3 through #11 bars - 1 in.
#14 through #18 bars - 2 in.
 

 

Placing Tolerances of Dowels

 

 
Centerline of dowel, vertical deviation measured from bottom of concrete slab at the joint for element depth 8 in. or less ±1/2 in.
When element depth is over 8 in. ±1 in.
Spacing of dowels, measured along a lone parallel to the specified spacing

 

±3 in.
Centerline of dowel with respect to a horizontal line that is perpendicular to the plane established by the joint: Horizontal and/or Vertical deviation ±1/2 in.
 

The total number of dowels shall not be fewer than that specified.

 

Source

CRSI Placing Reinforcing Bars - 9th Edition - get the guide now


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