Fiberglass And Rockwool, Which One Is The Best Soundproofing Materials?

Installation of the material and its quality contribute to the quality of soundproofing, but the density of rockwool helps reduce sound transmission of ~ 10 decibels through a wall. Fiberglass, on the other hand, blocks ~ 4 to 10 decibels. 

Fiberglass rolls are very effective for laying underneath floors and in between walls. especially the foil backed rolls like this one because they can also keep heat and cool in in Winter and Summer, making them very economical as well.

Soundproofing is usually something that people do before moving into a house, while the builders are still fixing the last details, so add this to your shopping list!