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Re: Double Shots (no chaser)

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Personally, I have given up powder actuated tools due to safety issues.
I have returned to manually hammering smaller diameter concrete nails or rely
on other fastening methods.
It is my recollection that the second shot can bend/break the nail shank in
many instances.

Steven A.
Los Angeles


mkrakower(--nospam--at)earthlink.net wrote:

> During a recent site visit, the contractor casually mentioned that some of
> 1/4 inch diameter powder actuated fasteners had been shot twice per
> fastener. These fasteners were only functioning to hold some small zones of
> metal lath away from a concrete bond beam for support of some plaster
> finishes. Much to my surprise, several other contractors subsequently told
> me this practice is not uncommon. I temporarily stopped the installer and
> had several of the double shots tested in tension. The measured values were
> acceptable and the installer corrected his technique to use only one shot.
>
> My limited knowledge of shot pin "theory" is that pin values are based on
> friction from displaced concrete compressing the pin shaft plus a tip
> fusion effect(sintering). It seems like a second shot messes up the whole
> situation. Has anyone else encountered this condition?
>
> Thanks in advance,
>
> Michael Krakower SE
> Arcadia, CA.
>
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