NCAA - DUAL CHAMPIONS!
Join Date: Mar 2000
Location: From Sarasota, FL sitting in front of a computer spewing random thoughts!
Bikes: Intense Uzzi SL, Masi Speciale, Trek 3700 Nashbar Single Speed, Old Cilo Road frame
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Actually it's not the vibrations causing the nails to come out, it's thermal expansion. Since the nail expands at a different rate than the wood, they back themselves out. Also, since the wood is fibrous and has different moisture contents, as the wood dries out the hole gets bigger. As it gets wet, it expands.
Combine these two factors and you have nail backing themselves out of holes constantly. A screw will prevent this from happening. However, if your screws are not coated or galvanized, the force is so great that it can actually pop the heads off of the screws at the weak point.
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