Mineral stone wool insulation batts are slightly better insulators ... A 2×4 stud cavity filled with blown-in cellulose has an R-value of about 13. Spray foam insulates better than all of these ...

A green product derived from recycled materials, cellulose insulation comes in loose-fill or blown-in formats ... batt insulation but denser. Mineral wool also repels water so mold can’t ...