As the name suggests, expanding foam is a material which hardens and expands when it comes in contact with air. It is a material widely used in filling cracks, walls, crevices, packaging, water proofing, and insulation. Home improvement projects such as these frequently require this material. You don't need any prior experience in handling it. Uses This lightweight foam is widely used for filling under decks, and filling any cracks and voids. It is also used in different types of insulation and flotation applications. It is mainly used in drought prevention, wherein, old houses have all sorts of cracks and holes and draft can enter in the houses very easily. Thus, an expanding foam sealant is applied to all the small cavities and holes to ideally fill them up. It can deter all sorts of pests and rats to enter the house as well. As this material has high density, it is used in architectural castings and different support applications. Since expanding foam has a splendid insulating quality, it is used in sealing and waterproofing holes, crevices, and other damages in a building's structure. When a ready-made door or window frame is placed in its proper position, there is still a gap in between the wall and the frame. This foaming material acts as a tight seal to clasp-fit that gap and act as a supportive sealant to the whole area. Expanding foam acts as the most inexpensive and lightweight prop material in the television and film industry. It is also used to pack and seal objects so that they can sustain long travel. This holds true while shipping in containers, most importantly, in fire prevention―in case a fire breaks out. Tips to Remember This foam type is not supposed to be applied in places where you store your expensive clothes, jewelry, accessories, and footwear. Not even in rooms that have expensive furnishings, plush carpets, upholstery, etc. It sticks pretty well to any object. The foam doesn't stick to dirty and damp surfaces though. In case you plan to clean or remove the foam off any surface, use solvents and cleaning materials like petrol. Make sure you wear proper insulation on your hands to avoid sticking around with the smell for long! This foam is also available in spray nozzles, with the help of which you can directly spray the foam into crevices and holes, and fill them up. This material is quite messy to use; it's advisable you hire a professional if you plan to use spray foam in getting a job done. Once you familiarize yourself with this material, you will see its effectiveness and importance in no time!