[bumpus]

If you leave sheetrock in the weather it will crumble. I plan on dumping mine in some foundation trenches after I weather it for a bit.

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I would advise against putting anything in or around a foundation of a house or other building that will rot or decay.

Later on there will be earth movements that could cause trouble, as the material changes it's form.

Dirt will settle in a little while but building material will take a lot longer and continue to decay and move for many years.

Anything that rots is not stable.