My house has wooden trim fastened to the rendered exterior, using rectangular section iron nails. Much of this trim is in poor condition and needs replacing. (I would remove it and make good, but The Management wants it replaced).
It would make my life a lot easier if I could fasten the replacement on by some means other than hammering masonry nails in while trying to hold a six feet length of 3" x 0.5" horizontal, up a ladder. Would a nail gun knock a masonry nail into cement render over blockwork? The blocks are soft enough to poke holes in with your bare hands, but the render is apparently proof against a nuclear attack and I suspect it holds the house up ...