Rockwool insulation is highly resistant to moisture and at the same time, it is also vapor permeable. It does not wick water. However, Rockwool is different because it is made from slag and basalt, which make it resistant to fire.
Fire-Resistant and non-combustible: adds extra minutes of fire safety to exterior and basement walls
Superior acoustic performance - increases the acoustic performance of exterior walls
Vapor permeable and water-resistant: allows the wall system to breathe
High recycled content: made from natural stone recycled content, HFC free