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Re: Nail Popping

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Roger Turk wrote:
> I recently inspected a house and when nail popping was pointed out to me, I
> dismissed it as being normal and explained that it was due to cycling of the
> moisture content of the wood.  I was then asked why the nails were popping
> only at the top of the wall and not lower in the wall and I couldn't answer
> that.
> Thinking about all the nail popping that I have seen, it seems that popping
> does occur predominately at the top of the wall and becomes less lower in the
> wall.  I have become very observant of the walls in my house and nail popping
> does seem to follow that pattern.
> Can anyone come up with a logical reason for this?
> I know that the temperature at the top of the wall is warmer than the
> temperature at floor level and that warmer air has the ability to hold more
> moisture than colder air, but can it make that much of a difference?
> A. Roger Turk, P.E.(Structural)
> Tucson, Arizona

I'm pretty sure that the nails don't "pop".  What happens is, the wood shrinks

James Bela
Oregon Earthquake Awareness