Rock wool is installed as loose insulation or as woven insulation batts. If your loose-fill insulation fits the visual cues for vermiculite, the first thing to do is to avoid disturbing it.
House Digest on MSN4mon
How To Insulate A Shed On A Budget (& Common Mistakes To Avoid Making)Less expensive mineral wool batt insulation is now widely available ... only because the building is a small recording studio ...
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