Hello, I have a house from 1970. The wall is load-bearing and about 15 cm thick. The first 5 cm is incredibly porous and easy to drill into. It looks like lecablock but in the middle, it suddenly stops and it's not rebar, but it looks gray like concrete. Is it hard concrete in the middle?
Probably concrete, which is well "procentad".
That is, it contains a lot of stone (gneiss, graystone, granite, take your pick) that is difficult to get through with a regular drill.
The first, porous layer is probably plaster.
That is, it contains a lot of stone (gneiss, graystone, granite, take your pick) that is difficult to get through with a regular drill.
The first, porous layer is probably plaster.
I'm drilling high up on the wall because an electrical cable is supposed to go out into the ceiling molding.
First, I encountered a rebar, so I angled the drill a bit sideways to bypass it, but it felt just as hard. I tried a new hole, and it stopped after 5.5 cm. I worked longer on the first hole, and it is actually 6 cm deep. I hit the rebar exactly at 5 cm, which would mean it's located between the porous and hard concrete if that makes sense. I'll try to take a photo inside the hole.
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It is too difficult to photograph inside the hole with the light but interpret it as that hard concrete may exist in the middle of aerated concrete.
Ordinary drill with hammer drilling function is what I had in the garage.
Since one of the holes was a bit deeper, I concluded it was hard concrete. I got through with a large Hiltiborr I found in the garage. Yes, there also seems to be some steel behind, which you can see if you look into the damaged concrete at the top of the wall to the left in the picture.
Since one of the holes was a bit deeper, I concluded it was hard concrete. I got through with a large Hiltiborr I found in the garage. Yes, there also seems to be some steel behind, which you can see if you look into the damaged concrete at the top of the wall to the left in the picture.
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