How can screwing a massively heavy object to a wall with four screws (like a water tank) be safe? I feel its always going to fall, taking a piece of the wall with it.

Question

Or screwing workout equipment which you constantly pull with your own weight.

EDIT: Forgot to add, I’m not in the US, I’m talking about brick or concrete walls, not drywalls. Although probably the basic principle applies when it comes to explaining how force works.

In: Physics

Answer 1

If in doubt, and if I’m hanging anything – excluding small stuff obviously, I use expanding bolts, so I don’t have to have that niggle in the back of my mind of if/when something gives out. I do a lot of “odd bits” for folk, and find the standard fitting supplied with so many things “ok” but, just that. Big fat expanding bolts are the way forward, they havn’t let me down yet 👌🏾