ELI5: Explain Like I'm 5

Building insulation materials

Insulation materials help to keep your home warm when it's cold outside and cool when it's hot outside and help to save energy. Insulation materials are usually made from glass, rock, or paper fibers that are very good at trapping heat and keeping it inside the house. They come in large rolls or small sheets that you can place in your roof, walls, windows, floors, and doors to keep the warm air in, and the cold air out. By insulating your home with these materials, your heating and cooling bills can be greatly reduced.