Cheap insulation. Is there such a thing?

Bad Sport said

Roll in fiberglass on metal walls = water in the fiberglass, not good.

Your best bet is closed cell vs. open cell spray in foam, it won't allow for condensation and it won't absorb moisture.

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This stuff is VERY pricey......And if not done right will end of falling off....There was a very large law suit a while back against one of the companies that manufactures/installs spray foam insulation....