Material in partition wall, 70s basement

[Daniel_76]

Hello everyone!

I have a brick house from the early 70s with a basement. I have a question regarding the material in one of the partition walls. I used 8-12mm cable holders (white plastic + nail) in the exterior wall, and these went in fine. However, I couldn't drive the last 3-4mm of the nail into the partition wall, it came to a complete stop with a "ringing" sound. Since there's a hole in the wall from before, I estimate the material is about 5cm before an air gap.

What is this material? What should I use to fasten the cable above the baseboard, as I don't want to nail into the board? The cable is an extension cord 5m long, slightly thicker than a standard outlet wire.

Regards,
Daniel

 

[Daniel_76]

Anyone have any idea what the wall consists of for a nail in a cable holder to come to a complete stop?
Tried in more places, same result...

/Daniel

 

[Krawk]

There is probably a steel beam at the bottom of the wall.
Or is it the same thing higher up?

 

[Jan-Å]

Concrete hollow block probably, with plaster on the outside. It's easy to nail into plaster, difficult in concrete. The hole you have beforehand is drilled in that case, and the air gap is the inside of the concrete hollow block.
I would nail into the floor baseboard or use shorter nails and nail into the plaster, but it works better in the baseboard.
Otherwise, you'll probably have to drill holes, plug, and screw.