How does a nail hold two things together? How doesn’t it not fall back out of the hole it created over time?
In: Engineering
It is just friction. Often on things that get a lot of movement (decks are a good example of this) the nails do slowly push themselves out of the holes. You’ve got to tap them back in.
Screws aren’t really any different except they have larger contact areas and the movement needs to be directional.
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