Try screws for lightweight concrete and lecablock.
http://essve.se/lattbetongskruv/
https://www.byggmax.se/spik-och-skruv/övriga-skruvar/lättbetongskruv-p24376
If it works, it's incredibly convenient compared to plugs, etc. Be prepared that not all screws will fasten perfectly. They are usually very sensitive to being over-tightened.
If you want thicker/higher battens than the screw is intended for, it usually works well to countersink first with a spade bit.
http://essve.se/lattbetongskruv/
https://www.byggmax.se/spik-och-skruv/övriga-skruvar/lättbetongskruv-p24376
If it works, it's incredibly convenient compared to plugs, etc. Be prepared that not all screws will fasten perfectly. They are usually very sensitive to being over-tightened.
If you want thicker/higher battens than the screw is intended for, it usually works well to countersink first with a spade bit.
How was it to drill? Very soft/easy or hard/slow?
Soft/easy = lättbetong
Hard/slow = concrete
What did the drill dust look like?
Depending on which manufacturer it is of concrete block, the voids can be in slightly different places, so if you are lucky/unlucky, it might be solid concrete all the way where you are drilling. It also depends on how the wall has been built, if mortar happened to be right where you drilled.
Soft/easy = lättbetong
Hard/slow = concrete
What did the drill dust look like?
Depending on which manufacturer it is of concrete block, the voids can be in slightly different places, so if you are lucky/unlucky, it might be solid concrete all the way where you are drilling. It also depends on how the wall has been built, if mortar happened to be right where you drilled.
Haven’t gotten around to it yet. No holes in the stone. The stones are just over 6 cm deep, then there's plaster/concrete or something. The picture is taken from the side and shows the wall in cross-section (there’s a "doorway" in the middle of the wall). Any new ideas based on one? Maybe concrete screws?
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· Västernorrland
· 11 692 posts
I would use long nail plugs. By long, I mean about a decimeter into the stone and perhaps more. The length will ensure it holds even if the holes aren't perfect. Concrete screws work in solid concrete, probably less effectively in porous stones.
Looks like lightweight concrete in some form; if you've drilled and it's easy to drill into and is porous, then it's lightweight concrete. If so, I would glue spacers with MS polymer glue and crisscross with a nail gun (i.e., place two nails at an angle against each other at each nail point). It will hold firmly and goes fairly quickly.
If you want to use nail plugs as described above and it's lightweight concrete, you can probably sacrifice a wood drill bit or buy a more expensive combo drill bit and do all the drilling in one step to save some time. However, my opinion is that nail plugs don't grip very well in lightweight concrete.
Regardless, a good combination of glue and mechanical fastening leaves no one disappointed.
If you want to use nail plugs as described above and it's lightweight concrete, you can probably sacrifice a wood drill bit or buy a more expensive combo drill bit and do all the drilling in one step to save some time. However, my opinion is that nail plugs don't grip very well in lightweight concrete.
Regardless, a good combination of glue and mechanical fastening leaves no one disappointed.
If it's slag block, the drill dust is usually black and stains terribly. The best fastening in slag block is coarse wood screws without plugs.
I think it looks more like old-model lightweight concrete blocks. They're also not great for securing things to, especially anything that might be subjected to jerks and impacts like a basketball hoop and climbing holds.
If you're going to frame the wall anyway, you might as well add a stud in the floor and ceiling and build an entirely new wall that can support what you want.
I think it looks more like old-model lightweight concrete blocks. They're also not great for securing things to, especially anything that might be subjected to jerks and impacts like a basketball hoop and climbing holds.
If you're going to frame the wall anyway, you might as well add a stud in the floor and ceiling and build an entirely new wall that can support what you want.