The picture shows a concrete wall cast in the form of rough-sawn boards. Since the shelf apparently weighs 20kg, red plugs should be sufficient. If the concrete has a high percentage of stone as was common before factory-mixed concrete, or for other reasons contains a lot of aggregate, I recommend a proper rotary hammer drill. Using anything else in such material takes more of a toll on your psyche than the wall.
Thank you so much for the great answer!
I have brought out both the Hitachi rotary hammer drill and various screwdrivers.
I unfortunately didn't have any "rödplugg". Could these work? I see they have some wings that rödplugg doesn't seem to have.
It can work, but you should use good plugs and not something from ÖoB. That, like the rotary hammer, saves your sanity. There is a big difference in the plastic of the plugs, and whether it's a good kind is hard to know without squeezing and feeling.
You mentioned earlier one screw per bracket, that sounds very little. What kind of brackets are they actually? I would be more worried about them than about the mounting in the wall.
If you're worried, you can always load-test the shelf without water. A decent shelf with brackets mounted in a solid concrete wall can easily support an adult sitting on it.
Thanks for the help in the thread! The question may seem silly, but previous setup attempts have often failed...
Now it's up. Seems as stable as can be. I've pressed firmly on the shelf without it moving.
It was 2 plugs per bracket.
I switched and used fischer Duo instead, which I also had at home.
I used a hammer drill and perceived the wall as somewhat porous (it took about 2 seconds to drill 5cm deep holes)
Killinallan said:
