Need to put up a small shelf with a 17kg load that MUST not fall down.
I want to ensure it's secure. How should I proceed?
The basement wall looks like the one in the picture and is very solid when you knock on it (regular concrete?).
Drill type?
Hammer drill?
Plug type?
Dimensions for screws, plugs, and drill?
Technique? Depth of drill holes?
Some previous attempts at installing on concrete walls have failed where the wall crumbled and had no bearing capacity, and the wall and floor looked like a sandbox...
Once you've fixed a bracket, hang from it with your entire weight. That's what I would do.
(The hearing protection is so ABBA doesn't sound like death metal for the rest of your life, nothing wrong with death metal perhaps, but sometimes you might want to listen to something else.)
You have Heavy in the headline, but then you write 17kg. If you're going to load with 17kg, one screw is actually enough; most shelves probably need 2 brackets and 2 screws for each bracket.
If you lack your own means to drill into concrete, I would rent or borrow a small rotary hammer with an SDS drill, such as a Hilti TE2.
A 5.5mm drill and red plug are sufficient for such a small load; typically, you drill about 4cm deep and can use screws with 30-40mm length.
Why not invest in something like this instead?
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This way you avoid all the drilling and screwing.
There are shelves in many designs:
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Thanks, but in this case, it's not possible as the sofa etc. is in the way. However, I have several of these in the garage and other basement areas.
Ssinuslinus said:
What does the shelf look like?
It's hard to give advice on suitable screws without a picture or description.
It's a shelf board with 2 standard brackets. There will be one screw hole per bracket.
Ffribygg said:
You have "Tung" in the title, but then write 17kg.
If you're going to load with 17kg, one screw is actually enough; most shelves need 2 brackets and 2 screws for each bracket.
If you lack the means to drill into concrete, I would rent or borrow a small hammer drill with an SDS drill, like a Hilti TE2.
A 5.5mm drill and red plug is enough for such a small load; usually, you drill about 4cm deep and can use screws with 30-40mm length.
Okay! Thanks for the clarification. I perceive 17kg as quite a lot more than I usually have on shelves. There will be 2 water-filled hydroponic grow boxes on it, so if they fall, I'll have water everywhere. It's 17kg plus the shelf board itself, so about 20kg in total.
When I screwed up shoe shelves on the wall next to it, the plugs were really bad, but maybe that was due to wrong technique/plugs, etc.
Thanks for all the great answers in the thread. I'll do as you said. Mounting the shelf this afternoon. I have access to a Hitachi screwdriver with percussion function (hammer drill).
What is the wall material? A basement can range from reinforced cast concrete to leca to hollow concrete blocks. When was the house built?
Have you tried drilling into the wall somewhere you don't plan to mount the shelf? Does it drill slowly or easily, and what color is the drill dust?
If it's tough and hard to drill, it might be concrete, in which case regular plugs work.
If it's easy to drill and the dust is slightly dark gray, it could be leca. In that case, ribbed nylon plugs might work.
If it's light gray, it could be concrete hollow blocks or just a thick layer of plaster. It might work with 6*120mm wood screws directly in without drilling. It might require plugs.
You can always install bracket rails instead of just brackets. This provides more attachment points and a better lever for the mounting. Using long screws with the plug pushed into the hole or plugs with a long neck can also work. This way, you get the attachment deep into the holler so the wall doesn't crack.
Thank you for all the good answers in the thread. I will now do as you suggested. I'm putting up the shelf this afternoon. I have access to a Hitachi screwdriver with impact function (hammer drill)
If you can get into the wall with a screwdriver with "impact drill function," I'd consider the wall weak. If you can get in with an impact screwdriver, I'd call it porous.
A final resort is always threaded rod and rubber expander or hollow sleeve and anchoring compound.
The image shows a concrete wall cast in the form of rough-sawn boards, since the shelf is apparently going to weigh 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 hammer drill, using anything else on such material takes more of a toll on the psyche than on the wall.
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KnockOnWood said: