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Cracking in older houses is a fact of nature. It can be especially aggravated in climates where the humidity changes rapidly and frequently, especially if the home does not breathe well (i.e., is very well insulated, but not very well vapor-barriered - and a house built in the 50's is almost certainly not vapor-barriered properly, if at all).
Recent drought conditions can also cause these problems, especially if occasional large rainfall amounts occur. However, a pier and beam foundation isn't a concrete vault type basement, and so you'd probably need some geological information about your area...are the piers on bedrock, for example? What is the soil composition?
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"To those of you who are wearing ties, I think my dad would appreciate it if you took them off." - Robert Moog
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