Title:
Concrete Q&A: Tolerances for Concrete Openings
Author(s):
Publication:
Concrete International
Volume:
45
Issue:
1
Appears on pages(s):
75-76
Keywords:
DOI:
10.14359/51738472
Date:
1/1/2023
Abstract:
Q: We recently completed a mid-rise concrete building. During construction, the owner’s testing agency conducted independent F-number and survey checks at all floor levels. The results indicated compliance with ACI 117-10(15)1 tolerances for floor flatness and top-of-slab elevations stated in the construction documents. We have just been advised that the window wall installer has complained that the full-height windows don’t fit between the slabs. Arguing that the separation between two slabs is considered an opening and therefore has a tighter tolerance than the slab elevation tolerances, the window installer is pressuring the owner to backcharge us to cover the cost of rework. We don’t think the space between two slabs constitutes an opening. Does ACI provide guidance on this tolerance issue?
Related References:
1. ACI Committee 117, “Specification for Tolerances for Concrete Construction and Materials (ACI 117-10) (Reapproved 2015),” American Concrete Institute, Farmington Hills, MI, 2010, 76 pp.
2. ACI Committee 117, “Guide for Tolerance Compatibility in Concrete Construction (ACI 117.1R-14),” American Concrete Institute, Farmington Hills, MI, 2014, 47 pp.