How do you insulate a 70s home with 2x4 walls that has fiber glass insulation?
What is the best way to insulate from the outside? Rock wool? How costly of a project is this?
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Here is an article that will give you a starting place about tearing down or rebuilding old walls. And here's another page all about how best to insulate exterior walls from the outside on older homes. Have a read over that to get some ideas and send us more details if you like and we can help come up with a solution - are you planning to strip it to the studs? And did you have a performance goal in mind (as in how many inches) or a budget limitation? Best is to strip it back to the sheathing then choose an insulation material, weather barrier, strapping and new siding.