These requirements are summarized as follows in Section D.9.2.4 of ACI 318-11:
Adhesive anchors installed in horizontal or upwardly inclined orientations to resist sustained tension loads shall be continuously inspected during installation by an inspector specially approved for that purpose by the building official. The special inspector shall furnish a report to the licensed design professional and building official that the work covered by the report has been performed and that the materials used and the installation procedures used conform with the approved contract documents and the Manufacturer’s Printed Installation Instructions (MPII).
Do all adhesive anchors require a certified installer?
No. As stated above, only adhesive anchors installed horizontally or upwardly inclined to resist sustained tension loads require a certified installer. Adhesive anchors installed vertically down, for instance when a wall or column dowel bar is missing, should not require a certified installer. If an adhesive anchor is installed horizontally for shear, a certified installer should not be required because that anchor does not resist sustained tension loads. However, only EORs will be able to make such a decision and they might not be willing to make a decision. Thus contractors should consider using a certified installer for all horizontal or upwardly inclined adhesive anchors.
Can workers install the anchors in a manner differing from that stated in the MPII?
Yes, but the contractor should get a form of permission prior to installing the anchors. Read the MPII and determine whether you need or want to do anything differently. You will need to get that variance in writing from the manufacturer and approved by the EOR prior to installing the anchor.
Based on the preceding information, contractors’ costs for anchor installation will increase and maintaining certified personnel will probably be a continuing activity when each installer, rather than an installation supervisor or supervisors, must be certified. Certifying seasonal employees may not return the investment on their training.