Mineral stone wool insulation batts are slightly better insulators ... compared with R-19 for fiberglass batts. A 2×4 stud cavity filled with blown-in cellulose has an R-value of about 13.

Cavity insulation is used in spaces between the ... Batts can also be made of mineral wool. Other types of insulation include loose-fill products made from fiberglass or cellulose that are blown ...

Trapped air between glass or mineral wool fibres reduces heat loss by conduction and convection. Walls 35 Cavity wall insulation fills the cavity between the outside walls with mineral wool ...