I have bought a 40x20x1.8 cm pine board that is finger-jointed from Biltema. My idea is to attach brackets similar to these:
These are attached with expansion screws in a plaster wall, and then a speaker weighing 10 KG is placed on this. If I'm unlucky, the cat might also decide to jump up on the speaker, making it 20 KG.
Should I consider different shelving units or will this work?
Exactly, the glulam board is not the weak link in that solution. With such small brackets, you will have a large tensile force in the expander, so I would be most worried about it pulling a hole in the plaster. The bracket itself will surely hold.
I have previously used expansion bolts in drywall successfully. Right now, I have a 65" TV hanging on 4 expansions and 2 wood screws in the same wall. Previously, I have had the following brackets with similar expansions (2 pcs) with the same speakers.
According to the description on the back of the bracket package, they should support 20 kg, and since they come with screws and plugs, it applies to this specific screw. An expansion bolt of the model I have should support 30-40 kg in a whole drywall, in this case, I use 2 so 60-80 kg and I need a maximum of 20 kg, so one would think that part should be calm?
BUT of course, I'm a bit unsure now when thomasx talks about how the expansion could actually be pulled outwards and that it could damage the 16mm thick drywall I have.
The weak point could clearly be the laminated pine board, but it sounds like it should be fine, which is impressive!
What other suggestions do you have for brackets that can easily support 20 kg?
I'm using 6D but the drywall is only 16 mm thick, so it's not really double which is a bit strange, but it's not single either. The expanders I've bought should work well though, it's better for them to be a bit deeper than shallow, the claws must not unfold inside the drywall as that would be bad.
That console is not a bit better.
It's the distance from the top screw to the bottom of the console that determines how much load there will be on the expander.
If you drill a new hole at the top of the fold on the first console, it will be stronger.
16 mm plasterboard? Is it really old, or is it newly built?
One option is to do as I did in the basement, set up double brackets, i.e., 4 of them. The question is whether it really makes any difference when the expanders are spread out over only 40 cm? It won't be as sleek, but it should hold better.
If the center falls, the TV will likely be lost, and this is a nicer Plasma that can't be replaced anymore unless you spend a large amount of money, so it's very important that the center stays where it should.
That bracket is not any better. It is the distance from the top screw to the bottom of the bracket that determines how much load there is on the expander. If you drill a new hole at the top in the crease of the first bracket, it becomes stronger.
16 mm drywall? Is it really old or newly built?
Protte
Unfortunately, I see no possibility to modify the first bracket.
The house is from the 70s, but the wall was set up much later, probably during the 2000s. Single drywall, as I understand, is 12-13 mm, but this is 16 mm, which is probably counted as single drywall, otherwise, the sheets would have to be really thin (8mm).
Maybe use a planed painted board or sheet rule to rule between the brackets and wall, screw the bracket into a stronger material and they will be fine!
Maybe use a planed painted board or plank rule to rule between the brackets and the wall, screw the bracket into a stronger material, and they should be fine!
You mean to put a planed painted board on the wall, fastened with expanders, and then mount the brackets on it? That would certainly allow for more expanders along the board, but it also means the speaker would be an additional 2-3 cm from the wall.
Do you really think that 2 or even 4 expanders wouldn't be able to hold a center in place when it's in 16mm drywall?
I had the same center in drywall in the apartment before with the other brackets I showed. At that time, it had 2 expanders in the top holes, and in the bottom, there were just regular screws directly into the drywall, i.e., not much more than looks.
If nothing else, shouldn't 4 brackets instead of 2 do the trick?
