Insulation batts are pre-cut insulation designed to fit between rafters, studs, or wall joists and are generally made from glass wool, Rockwool, and polyester insulation. They work by restricting the flow of heat or sound through walls, ceilings or floors and are one of the most relevant, affordable, easy to install, easy to access, and most effective of all insulations. It’s essential when installing insulation batts not to leave any gaps, which can reduce insulation’s efficiency