Tried to install the roller blind in the living room earlier today.
Drilled and inserted a wall plug - which disappeared deep into the hole. Inserted a larger plug, which also fit even though I hadn't drilled such a deep hole.
No screws hold, everything just spins around and enlarges the hole. It feels like the whole wall is crumbling.
I'll see if I can take a picture or film it later, but I was wondering if anyone knows what to do instead or what might be wrong?
The strange thing is that the hole drilled 2 cm lower doesn't behave that way at all. It holds perfectly right away.
We have a couple of walls like this, completely hopeless. Now we have to go without a roller blind in that room since it's not possible to drill any more holes.
For me, who knows nothing, it first seems like there's something gray and concrete-like that crumbles and makes a huge hole, and inside that, there's a void.
Drilled and inserted a wall plug - which disappeared deep into the hole. Inserted a larger plug, which also fit even though I hadn't drilled such a deep hole.
No screws hold, everything just spins around and enlarges the hole. It feels like the whole wall is crumbling.
I'll see if I can take a picture or film it later, but I was wondering if anyone knows what to do instead or what might be wrong?
The strange thing is that the hole drilled 2 cm lower doesn't behave that way at all. It holds perfectly right away.
We have a couple of walls like this, completely hopeless. Now we have to go without a roller blind in that room since it's not possible to drill any more holes.
For me, who knows nothing, it first seems like there's something gray and concrete-like that crumbles and makes a huge hole, and inside that, there's a void.
Siporex? or some other type of lightweight concrete? or concrete block seems like it. Our house is built with a mix of blåbetong, siporex (or however it's spelled?) and concrete block, and that's what it's like to drill here. Most of the time, I can drill with the screwdriver without percussion and a concrete drill bit that just disappears into the wall, but once in a while, I have to use the hammer drill to make a 5.5 mm hole. I've had to wedge many plugs with wood splinters, which works just fine. Sometimes the drill hits something that makes it suddenly veer 45 degrees, and the hole becomes the size of a 1-krona coin. All the walls are plastered as well, so that layer can always be penetrated with "anything." I've learned to always start with a smaller drill bit than the plug requires and be "easy on the gas" 
and to have many different sizes and models of Fisher plugs at home.
You need a plug that can both function as a plug in the concrete if you drilled between the holes in the stone and turns into an anchor if it ends up in the stone's hole. But you must get the first layer of plaster to hold together preferably so that the plug can fasten in it too. But if you have walls like ours, sometimes it's hopeless to get it right, and then you might have to cast some sort of mortar that you can press the plug into and wait for it to dry.
and to have many different sizes and models of Fisher plugs at home. You need a plug that can both function as a plug in the concrete if you drilled between the holes in the stone and turns into an anchor if it ends up in the stone's hole. But you must get the first layer of plaster to hold together preferably so that the plug can fasten in it too. But if you have walls like ours, sometimes it's hopeless to get it right, and then you might have to cast some sort of mortar that you can press the plug into and wait for it to dry.
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In such situations, toxtrika plugs are good, there are also similar plugs that are not of that brand but look the same.
I have the same walls as you, it's blue concrete with just slag on the outside and in many places it's already drilled. As mentioned before, always use a smaller drill bit, for a 6mm plug use a 5mm drill bit, ideally, you should need to tap the plug in slightly. When you've drilled, don't blow away the dust in the hole, it fills in and helps prevent the plug from spinning, you can moisten the plug in your mouth and drag it a bit in the fine dust on the floor, then it sticks on the plug, and it’s not so smooth that it spins around. But if it goes in tight, you probably don't need it.
If the holes are too large, you can buy superspackel that you use to fill your, for example, 8mm holes and then when it's cured for 2 days or so, you drill new, for example, 6mm...
What kind of plugs are you using?
I have the same walls as you, it's blue concrete with just slag on the outside and in many places it's already drilled. As mentioned before, always use a smaller drill bit, for a 6mm plug use a 5mm drill bit, ideally, you should need to tap the plug in slightly. When you've drilled, don't blow away the dust in the hole, it fills in and helps prevent the plug from spinning, you can moisten the plug in your mouth and drag it a bit in the fine dust on the floor, then it sticks on the plug, and it’s not so smooth that it spins around. But if it goes in tight, you probably don't need it.
If the holes are too large, you can buy superspackel that you use to fill your, for example, 8mm holes and then when it's cured for 2 days or so, you drill new, for example, 6mm...
What kind of plugs are you using?
Roller blinds, curtain rods are indeed a classic in old houses because that's where all previous owners have drilled too That's when the tip from "Andy78" is good, knock off everything loose and fill with superspackel and start over.
That's when the tip from "Andy78" is good, knock off everything loose and fill with superspackel and start over.The building material should be white Ytong.
We will test with a smaller drill later, but I experienced the same issue when I was drilling in the bedroom where there's a limited area that is as bad as where Annkina tried to put up the roller blind.
It is doubtful if it makes a difference how you use the drill, because it wasn't even possible to gently place a nail where it's at its worst. At least not if something with weight is supposed to hang on it...
It's also not just where curtain rods or other things have been hung, but also where it seems to be untouched since someone drilled before.
We will test with a smaller drill later, but I experienced the same issue when I was drilling in the bedroom where there's a limited area that is as bad as where Annkina tried to put up the roller blind.
It is doubtful if it makes a difference how you use the drill, because it wasn't even possible to gently place a nail where it's at its worst. At least not if something with weight is supposed to hang on it...
It's also not just where curtain rods or other things have been hung, but also where it seems to be untouched since someone drilled before.
I recognize this problem from my garage, where I was going to put up brackets (is that how it's spelled?).Annkina said:
I'm not really familiar with the difference between plaster and various types of concrete and mortar etc. But I used long anchor bolts and then screwed even longer wood screws into them and it worked well. But it wasn't very professional, of course.