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You directly say how thick your wall is, a single brick wall 12mm can be hung outside,
In principle, hollow bricks make exterior walls noisy, because the sealing of hollow bricks is really bad.
Normally, it shouldn't be, although the thickness of the board is not very thick, but it is also in centimeters, mainly because the length of the board is one foot smaller, that is, 30 cm, so if you give a little strength, it will not break.
The key is whether the beams under the bed are strong enough for the planks are not a problem, and the slats on the plank beds sold in furniture stores are no more than that.
The more sticks, the more the force can be dispersed, no problem.
This is a bit difficult, the wood has a certain elasticity, and the size of this specification is short, and it can only be broken hard!