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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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2 3 4 MASONRY CONCRETE CORE HAMMER DRILL BIT SDS Max
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160 X 10 mm SDS Rotary Hammer Concrete Masonry Drill Bit Round Shank Carbide Tip
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Wet Granite Concrete sander 1 1 2 40mm Half Bullnose Diamond core drill bit pad
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BLUEROCK Tools 12Z1 LRBTS CORE DRILL 2 SPEED W TILTING STAND CONCRETE CORI
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4 PIECES NEW CONCRETE CORE DRILL OF 52MM77 MM102MM127MM FOR WET CORE DRILLING
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NEW AERO DIAMOND CORE DRILL OF DIAMETER 127MM FOR WET CORE DRILLING OF CONCRETE
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NEW PREMIUM DIAMOND CORE DRILL OF 20MM DIAMETER FOR WET CUTTING OF CONCRETE
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