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[–][deleted] 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (1 child)

The original design called for concrete, not spray foam which can flake off.

[–]Tom_Bombadil 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

Source?

Edit: FYI - This spray foam can resist shotgun blasts. It is quite resilient.