carl mciver wrote:
"Ignoramus677" wrote in message
. ..
| I am confused as to what happens when concrete nails are shot into
| concrete with nail shooting guns. Why don't the nails get bent? Where
| does the concrete that is displaced from the hole, go? Why would the
| incompressible nail hold in incompressible concrete and not fall out
| of its hole?
|
| i

If the concrete is a day or two old you can use a regular carpenter's
hammer, and for the next three weeks or so a power nailer will do just fine,
but after a few years you'd likely be better off boring holes. That's
pretty much been my experience, but YMMV.

Yea tell me about it. :-) While at the university I had the unplesant
task of "trying" to mount a few brackets to a poured concrete wall.
It was in the chemistry building, about 50 yrs old. I think they
must have used better concrete mix back then also. :-) Couldn't even
drill 1/4 in. holes with a hammer drill.
...lew...