Insulation products come in two main categories/types ― bulk and reflective ― which are sometimes combined into a composite material. Bulk insulation comes in many shapes, thicknesses and materials and is primarily used in ceilings and sometimes in walls. The most common bulk insulation material is mineral wool or fiberglass. Other materials include recycled and virgin polyester, wool and cellulose fibre. Bulk insulation stops heat flow by trapping air in small air pockets. Reflective insulation usually made of an aluminum foil installed on a variety of backings, such as paper, rigid foam, plastic film, polyethylene bubbles or cardboard. They are designed to reduce heat transfer through radiation by placing a surface that reflects thermal radiation in combination with an air gap. We noticed that most people thought that only bulk insulation can reduce the heat transfer into their buildings but not aware about reflective insulation which is more effective for that function especially during/or in hot weather. Check the video below to know which insulation types will performs better in reducing the heat tranfer into your building.. The type and level of insulation you need for your home varies on where you live, the building materials used for your house and whether you will be using additional heating or cooling.