The house was built around 1958. It has aluminum siding. It has little to no insulation in the walls. About 15 years ago I tried to get sprayed in insulation put in the walls. The company told me they couldn't because the 2x4s were the wrong way and the foam didn't have room to expand. The interior walls that touch the outside keep getting mold on them. I keep cleaning with bleach, but it keeps coming back. Someone told me if take of the siding, put insulation, and put new siding that the mold would go away. Is that true? If not, what would be the best way to fix this problem? Over the years it is getting worse.
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