I was going to hang up a curtain rod and thought the wall was lightweight concrete. I drilled an 8mm hole and inserted a lightweight concrete plug (one like this: http://75.126.23.201/25/38025.jpg). I started to screw in the screw and the whole plug disappeared, and I realized it's not a concrete wall. I pulled out the plug and now I have a hole that's 10mm, maybe even 12mm.
What should I do now? I've measured that the thickness of the wall is about 24mm, and then it's filled with insulation. Should I repair the hole and use a drywall expander or just use a drywall expander directly? Any other ideas?
Often when the walls are so porous, the hole always becomes larger when drilling, which means that regular plugs won't work. Try using a drywall anchor, and if that doesn't work, you can use threaded rod and anchor compound. However, it might not look so nice for what you intend to use it for.
There is also "driva" which looks like a large screw with a substantial thread, and then you screw the regular screw into it, but it should probably only have a 10mm hole. Molly pliers and drywall anchors are probably the best.
I would have tried a larger model metal expander (if it's drywall). You need a metal expander tool so the plug doesn't rotate and ruin the hole even more during the expansion phase.
If you then want to remove this plug, bend back the visible edges with something like needle-nose pliers and push the plug into the wall for minimal damage to the drywall. You should be able to try this without damaging the wall more than it already is.
Anchor paste and threaded rod? Is that for a concrete wall? I can't figure out how it would work with drywall.
If it is plasterboard (we assume double plasterboard since you say it is 24mm), then use a Molly bolt for double plasterboard, the easiest way to get it right is with a Molly tool.
The hole is even 14mm. There are expander plugs for this, but I don't think the screw will fit through the actual bracket. Maybe it's best to repair the hole, how do I do this in the best way so that it's stable enough to place an expander plug in the same spot?
Try using a slightly smaller metal expander with the expansion pliers in the existing hole (or as large as possible). As long as it expands on the backside, it will get support on the front with the help of the curtain rod. If it doesn't work, pry off the flange and push it into the wall.
After all, it's just a curtain, it won't hold if you swing on it.
There are no shortcuts, with plaster you often only get one chance... I don't think filler will be strong enough.
There are certainly smoother and better ways, but when you wrote that the screw for a suitably sized molly plug probably wouldn't fit the bracket for the curtain rod, I immediately thought of Helicoil.
Edit: I have to admit that the very first thing I thought was: "-why doesn't he just drill out the hole in the bracket?" but I assume that for various reasons it wouldn't work well.
Sometimes you can insert a piece of wood behind the frame before you attach the piece of plasterboard, it becomes strong and good. But damn, the trouble you get yourself into. Patch up and move 1-2 cm. Or drill a nice hole, glue in a piece of dowel, and screw in new, everything is allowed.
do you have two identical holes now or have you only done it on one side?
What do you have behind the insulation and that?
A curtain rod holder usually has two holes quite close to each other, so you should have two holes...?
I would have gone with Molly, the only downside is that the plate becomes so large that the mount might not cover it, depending on what your curtain rod mount looks like.
If it's a small mount, I've moved it and tried to place the hole behind the mount if possible (after it has been filled).
Long damn screws
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