Stone-coated steel roofs are a popular choice for homes because they weigh only 1.4 lbs per square foot, making them lighter than wet wood shakes or composition shingles that can be up to 10 pounds heavier each depending on the material used by the manufacturer! You won't need any extra engineering and reinforcing when installing these lightweight panels over most existing types of roofs either - just make sure it's been done before you start installing your new Boral Panel installation process so nothing gets damaged during transport and installation.