Building insulation materials is used depends on a wide variety of factors. Some insulation materials have health risks, some so significant the materials are no longer allowed to be used but remain in use in some older buildings such as asbestos fibers and urea. Factors affecting the type and amount of insulation to use in a building include: Considerations regarding building and climate: Often a combination of materials is used to achieve an optimum solution and there are products which combine different types of insulation into a single form. Spray foam is a type of insulation that is sprayed in place through a
Building insulation Aerogel was first discovered by Samuel Stephens Kistle in 1931. It is a kind of gel that the liquid part is replaced by gas, it actually is composed of 99% of air. This material has a relatively high R-value of around R-10 per inch which is considerably higher compared with conventional plastic foam insulation materials. But the difficulties in processing and low productivity limit the development of Aerogels, the cost price of this material still remains at a high level. Only two companies in the United States offer the commercial Aerogel product. In hot conditions, the greatest source of heat