no matter how well they pack the dirt underneath or how thick they make the concrete foundation a house is very heavy.
and on the grand scale of things stuff like wood and sheetrock may seem stiff and solid but trying to hold all that weight and pressure together over time things begin to flex and shift as the weight of the house finds its final resting position. this is called settling and is what causes cracks in the concrete and warps in door frames for example.
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