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RE: ICC ES Memo Information From Simpson Strongtie

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Title: RE: ICC ES Memo Information From Simpson Strongtie

In response the Wendy Allen of Simpson Strong Tie letter dated March 13, 2007, I would like to offer up some clarification.  In the final paragraph of Ms. Allen's email she states:

It is important to note, that at this point in time, there are NO products on the market with code reports that meet the criteria of either AC193 or AC308.

Please note that a correct assessment of the situation should be stated as, "There are no concrete screw anchor or adhesive anchors on the market with code reports that meet the criteria of either AC193 or AC308."

There are however 5 reports of expansion and undercut anchors which meet the requirements of AC193 and are compliant with both the 1997 UBC [thus the 2001 CBC] as well as the 2000 and 2003 IBC.  4 of the 5 products comply with all seismic design categories A-F and are acceptable for use in cracked concrete.  The fifth is only approved for SDC A & B and non-seismic applications.

These 5 products in order of issue date are:

Hilti Kwik Bolt TZ Expansion Anchor ESR 1917
Hilti HSL-3 Heavy Duty Expansion Anchor ESR 1545
Hilti HDA Undercut Anchor ESR 1546
USP DUC Undercut Anchor ESR 1970
ITW Red Head Trubolt Expansion Anchor ESR 2251 [SDC A&B only, uncracked concrete]

These reports can be downloaded from the ICC website at

It is important to note that although all post-installed anchors [concrete screw, adhesive, undercut, and expansion] analyzed under the legacy criteria AC01, AC58, and AC106 have been stripped of their moderate and high seismic recognition [SDC C-F] in concrete base materials as of January 1, 2007, that the 5 products listed above can be used to comply with the current requirements of the CBC 2001 for seismic use.

Lucas Floriani, PE
Southwest Division Technical Services Manager

Hilti North America

5400 S 122nd E Ave I Tulsa, OK 74146
P 800-879-6000 ext. 7920 I F 918-461-7526 I M 714-814-0882