Mississippi Energy Extension Center, Cooperative Extension Service, Mississippi State University. Readily absorbs moisture which may affect flame retardant chemicals. Usually has boric acid or borax to resist rodent and varmint attraction caused by starch. Mineral wool fiber glass 2.0-3.7 Made from rock slag or glass. It will not burn.
Moisture can collect on fibers but when dry, R value is regained.
Is available in loose fill, batts and blankets. Available to contractors only. Urea formaldehyde 4-4.5 Resists spread of flames in case of fire. May absorb moisture but dries to original condition. Is formed in place.