Well... funny you should ask...
Some 20 years ago I had my stash in a back bedroom in the apartment I rented. It was an old house - 1930's vintage - upper & lower flats. Plaster walls (not insulated), plaster ceilings. I and my stash were upstairs.
The ceiling of the bedroom directly below my sewing room developed some cracks, and the landlord tried to blame it on my stash.
Hmmm... I only had 100 half-bolts at the time, so...
Weighing it all out, and figuring that the furniture (shelves + sewing machine) that I had weighed about as much as a typical set of bedroom furniture, to say that the stash was the cause of the cracks would have been the same as saying that if four average-sized people were in that room, it would have been sufficient to cause the problem.
'Course... it's not likely that four persons would have STAYED in the back bedroom round-the-clock...
Oh, let's not even GO there!