How do you insulate a 70s home with 2x4 walls that has fiber glass insulation?

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How do you insulate a 70s home with 2x4 walls that has fiber glass insulation?

Mark Aussenegg Published: Nov. 26, 2018, 6:49 p.m.Last updated: Aug. 2, 2020, 12:29 p.m.

What is the best way to insulate from the outside? Rock wool? How costly of a project is this?

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