Foam injection should be mandatory, and spray foam roofs too!
There is the huge benefit of helping to keep bugs out as well, as the foam contains boric acid. There is a reason Publix stores, and others I'm sure, always foam inject. It also strengthens walls (and roofs). It used to be less than 1500 bucks, the best upgrade imho, but again, it should be a standard feature. A good builder would use it.
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