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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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NEW 12 Diamond WET Coring Bit For Concrete Core Drill by BLUEROCK  Tools
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NEW AERO DIAMOND CORE DRILL OF DIAMETER 127MM FOR WET CORE DRILLING OF CONCRETE
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BLUEROCK Tools 12Z1 LRBTS CORE DRILL 2 SPEED W TILTING STAND CONCRETE CORING
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NEW PREMIUM CONCRETE CORE DRILL OF DIAMETER 52MM77 MM102MM 127MM 1 PIECE EACH
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4 PIECES NEW CONCRETE CORE DRILL OF 52MM77 MM102MM127MM FOR WET CORE DRILLING
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NEW PREMIUM DIAMOND CORE DRILL OF 20MM DIAMETER FOR WET CUTTING OF CONCRETE
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NEW 22MM DIAMETER PREMIUM DIAMOND CORE DRILL FOR WET CUTTING OF CONCRETE
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Heavy Duty Sds Plus Masonry Drill Bit 65X210mm Tungsten Carbide Concrete Stone
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1pc 350mm Long SDS Max Core Shank Drill Arbor for Wall Concrete Drill Holesaw US
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260 X 8 mm SDS Rotary Hammer Concrete Masonry Drill Bit Round Shank Carbide Tip
260 X 8 mm SDS Rotary Hammer Concrete Masonry Drill Bit Round Shank Carbide Tip
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260 X 10 mm SDS Rotary Hammer Concrete Masonry Drill Bit Round Shank Carbide Tip
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350 X 10 mm SDS Rotary Hammer Concrete Masonry Drill Bit Round Shank Carbide Tip
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460 X 8 mm SDS Rotary Hammer Concrete Masonry Drill Bit Round Shank Carbide Tip
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10mm Round Shank SDS Plus Rotary Hammer Concrete Masonary Drill Bit
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