Best building thermal insulation

Glass wool or Rock wool, which is the best choice of thermal insulation material?

It depends on the application and your budget. The rockwool insulation is more dense (KG/M3) than the glasswool insulation. The rockwool is also economical as compared to glasswool insulation. In some cases where the air velocity is greater one must use rockwool because it does not decay to much and does not cause any health issues. Glasswool and rockwool, both are incombustible so you can choose whatever you want. But we will suggested you the economy one up to yours detail project.