Drill in ceiling

[Fredrik111]

I'm going to install a ceiling light fixture in my kitchen ceiling and planned to drill three small holes. It stops after just over a centimeter. I've tried both hammer and metal drill bits. What could the material be?

The building is a multi-family house built in 1943. I believe the walls are called "franska väggar". Could it be granite in the ceiling, or?

 

[maah]

Sounds like plaster on concrete.
What kind of drill do you have?
Have you tried in multiple places?
You might have bad luck hitting a stone in the concrete, and then it becomes hard.

 

[Fredrik111]

Sounds like plaster on concrete.
What kind of hammer drill do you have?
Have you tried in several places?
You could be unlucky and hit a stone in the concrete, and then it becomes hard.

Yes, similar in all holes. Does it stop if you hit a stone in concrete, or should my machine handle it?

 

[etompau]

Does the drill have a hammer function? It's not clear from the picture.
What type of drill bit are you using? Drill bits for metal are not suitable to use.

 

[Fredrik111]

Does the drill have a hammer function? It's not clear from the picture.
What drill bit are you using? Drill bits for metal are not suitable to use.

Absolutely, it has a hammer function. And in the picture, I have a metal drill bit, but that was just to test to see if I hadn't reached wood. When I use the hammer function, I have a cormant drill (or whatever it's called).

 

[Gukken]

The drill should have a hammer function. At least it said so when I googled the model number.
Unclear if you are using a concrete drill?

 

[Gukken]

Absolutely, it has percussion. And in the picture, I have a metal drill bit, but that was just to test that I hadn't reached the wood. When I use percussion, I have a cormant drill bit (or whatever it's called).

It could be that you're hitting a rebar as well. Then it becomes difficult. Alternatively, you can move the hole a bit.

 

[Stefan N]

Get a real machine, that one is not made for drilling into concrete.

 

[roli]

It could be that you hit a reinforcing bar as well. Then it goes slowly. Alternatively, move the hole a little.

Not after 1 cm drilling depth, the reinforcement should be deeper in the concrete otherwise it isn't much of a reinforcement...

 

[Gukken]

Not after 1 cm of drilling depth, the reinforcement should be further into the concrete otherwise it's not much of a reinforcement...

Sure, at 10mm there shouldn't be much reinforcement. But reinforcement is used for other things too. Like mounting bars, creating distance, etc.

 

[roli]

Sure, at 10mm there shouldn't be that much reinforcement. But reinforcement is also used for some other things. Like mounting iron, creating distance, etc.

Sure, but they should still be laid with a "covering concrete layer" regardless of use, and the covering concrete layer is not 10mm. And since the first 10mm was easy to drill, it's probably not concrete. The minimum measure from the edge of the concrete to where reinforcement may be found is at least 20-30mm, probably more.

 

[Fredrik111]

It was probably me being a bit timid with the drilling, and also the first drill bit was probably a bit worn. When I switched to a larger drill bit and applied more pressure, I was able to drill.