Post-Installed Concrete Anchor Installation Inspection
What this domain tests
Inspection of post-installed anchors is about verifying that the installed condition matches the design basis: the correct product, the correct hole, the correct cleaning, the correct setting, and the correct record. A candidate must know the anatomy of an adhesive or mechanical anchor system, the role of the manufacturer's printed installation instructions (MPII), and the difference between a design assumption and a field condition.
Core concepts
- Product identity: verify the anchor type, size, length, and thread grade against the approved submittal. Substitutions without engineering approval are a classic trap.
- Hole preparation: drill diameter and depth, drill type (hammer, rotary, core), and the condition of the bit. Oversized, shallow, or misaligned holes change capacity.
- Cleaning: the most common field failure. Know the specified sequence - brush diameter and number of passes, blow-out, and whether the hole must be dry, damp, or water-saturated per the product.
- Setting: adhesive mixing, gel and cure times as a function of base-material temperature, torque values, and embedment marks.
- Edge distance and spacing: compare as-built to the design; anchors moved in the field need re-evaluation.
- Records: installation logs, torque checks, and photographic evidence.
Traps in questions
Questions often describe a nearly correct installation - right product, right depth, but cleaning skipped or the wrong brush size. Another trap is temperature: cure time is set by concrete temperature, not air temperature, and cold concrete extends cure dramatically.
Worked example
An adhesive anchor requires a 5/8 in hole, 4-3/4 in embedment, and a 2-hour cure at 70 °F concrete. Field concrete reads 50 °F, which per the chart doubles cure time. The inspector should require 4 hours before torqueing, not 2.
Rule of thumb
If any step of hole preparation cannot be verified, treat the anchor as non-compliant until re-drilled or proven by testing.