RE: Cement fastening ...

[hkelsey]

I had a whole wall of shelves come down on me with the self tapping anchor
screws. The hole gets enlarged as the drill point wears, and in old concrete
the holes are crumbling on the surfaces.
Best anchor is lag bolts and expansion shield inserts. The expansion shields
are about 3/4" long. I have a 3/8" combination hammer drill/drill that works
OK. If you can though, borrow or rent a Hilty . They put holes in old
concrete like going through butter.
Harley