Drop-in Anchors
Drop-in Anchors
(OP)
What are your thoughts on drop-in anchors?
I require that all concrete anchors have an ICC-ES report on my typical job. I don't know of any drop-in anchors that have an ICC-ES report (please tell me if you know of one). I'm guessing that drop-in anchors aren't as reliable as other anchor types and that's why there aren't any with reports. Contractors seem to love them, but that doesn't mean the should be used.
Do you allow drop-in anchors on your jobs? Why or why not.
I require that all concrete anchors have an ICC-ES report on my typical job. I don't know of any drop-in anchors that have an ICC-ES report (please tell me if you know of one). I'm guessing that drop-in anchors aren't as reliable as other anchor types and that's why there aren't any with reports. Contractors seem to love them, but that doesn't mean the should be used.
Do you allow drop-in anchors on your jobs? Why or why not.






RE: Drop-in Anchors
I allow them because we are not in a seismic area here, otherwise would prefer epoxy. I like Titens too.
RE: Drop-in Anchors
RE: Drop-in Anchors
An anchor is only as reliable as its installer.. we make sure our crews are trained by Hilti engineers. Proper cleaning of the drilled holes is the key to a good installation, and having the right equipment makes cleaning the holes easy. We usually have the steel erectors install the epoxy anchors, they tend to be much more accurate with their layout than concrete installers w/cast in place.
RE: Drop-in Anchors
RE: Drop-in Anchors
RE: Drop-in Anchors
Powers Fasteners makes a flush screw anchor with internal threads; see http://www.icc-es.org/reports/pdf_files/ESR-2272.p.... Also, I have seen Hilti HSL expansion anchors specified when a flush anchor is needed (only comes in metric sizes).
Crakerjack,
Hilti's drop-in anchor is the HDI, See https://www.us.hilti.com/anchor-systems/flush-anch...
RE: Drop-in Anchors
RE: Drop-in Anchors
RE: Drop-in Anchors
Do you have a reference or technical article saying that? I'm not being argumentative; I would like such a thing handy if I have to argue against their use. Thanks.
RE: Drop-in Anchors
It was per a Simpson Strong-Tie seminar, the speaker expressed it verbally. I will look into it later, right now I am involved with a truss failure conflict.
RE: Drop-in Anchors
Here are the answers. (This is from my notes and memory - what the speaker at the seminar said.)
Most modern Simpson drop-in bolts are rated by ICC to comply with cracked concrete conditions. They say so in the catalog.
If the bolt is not rated for cracked, then it will have huge decrease in actual capacity, when it is used in cracked concrete.
This Simpson bolt actually performs best in cracked concrete is very expensive, and the builder may get sticker shock. It is the Torq-Cut Self-Undercutting Anchor.
RE: Drop-in Anchors
Thank you very much! Especially since I know you are under the gun on the project you mentioned.