"Rudy" wrote in message
...

Need a 1/2 hammer drill and mason bit for concrete. The combo will go
through most concrete and mortar like butter.

Why is it that when I try to (hammer) drill a series of 6-8 holes in my
basement floor slab to use TAPCONS (for 1 1/4" concrete penetration) to
anchor a bottom plate, HALF of them will only go down about 1/2" and then
thats it.. no further. I 've even moved the bit 1"-2" side to side and
started new holes but no luck..

Am I hitting ROCKS in the concrete mix or maybe REBAR ?

How old is the concrete? Is it possible there's a much newer layer over an
older one?

--
Bobby G.