Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

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APPENDIX A
Dimensional Tolerances
for Concrete Structures
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The plans or drawings for concrete structures frequently specify
the permissible variations from lines, grades, and dimensions
that the contractor is expected to observe. The tolerances
should be realistic, considering the nature of the structure. Tolerances
that are more rigid than justified will increase the cost of a
structure unnecessarily.
The following tolerances are excerpts from the American Concrete
Institute publication ACI 117-90, “Standard Tolerances for Concrete
Construction.” The ACI standard also contains tolerances related
to materials, precast concrete, and masonry. The following is reprinted
with permission from the American Concrete Institute.
Tolerances of Cast-in-Place Concrete for Buildings
1. Vertical alignment:
(a) For height 100 ft or less:
Lines, surfaces, and arrises ............................................ 1 in.
Outside corner of exposed corner columns and control
joint grooves in concrete exposed to view .............. ½ in.
(b) For heights greater than 100 ft:
Lines, surfaces, and arrises, ¹⁄1000 times the
height but not more than ............................................ 6 in.
Outside corner of exposed corner columns and
control joint grooves in concrete, ¹⁄1000 ¹⁄600 times
the height but not more than .................................... 3 in.
2. Lateral alignment:
(a) Members ........................................................................... 1 in.
(b) In slabs, centerline location of openings 12 in. or
smaller and edge location of larger openings ............ ½ in.
(c) Sawcuts, joints, and weakened plane embedments
in slabs .............................................................................. ¾ in.
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