I've got a client looking for a letter certifying the "longevity" of using powder actuated fasteners for a ceiling grid system. I know these fasteners have been used for ceiling grids as well as pipe supports for some time now. I am unwilling to write a letter unless I have some kind of testing, certification, or reference saying why it can be used. I've review AC70, ASTM E1190 and Hilti's ESR 2347 (I'm actually using threaded stud fasteners) and have not found anything definitive. The only statement that is close is in ESR 2347 Section 2.0 USES, where it says that the fasteners maybe used to replace welds and bolts used to attach materials to structural steel (which is my base material) as per IBC 2204.1 and 2204.2. Is this enough? Any thoughts would be helpful!
Oh bye the way, I already asked Hilti and they are still looking...
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