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Concrete Drill

What is inside this concrete interior wall?

This is the first time I've lived in a house made with concrete walls, and I'm having trouble installing shelves, towel bars, etc.

I have a concrete drill bit; that's not the problem. What happens is that I can only drill in about an inch, then the drill bit hits another surface with more resistance...except in some spots, where it goes through with no problem.

It seems like maybe it's just drywall covering the concrete, except for how this only happens in certain areas. There doesn't seem to be any rhyme or reason to it, and I'm worried that I might hit some electrical wiring.

Could anybody tell me how concrete interior walls are generally constructed?

Thanks.

the above posts sound correct. You probably have sheet rock over masonry walls.

Cheers and good luck!

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