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
Wool insulation insulation, also called slag wool or rock wool, which only resembles natural wool fibers. It is actually made from rock, blast furnace slag, and other raw materials which are melted and spun into fibers. Sheep wool is a natural, sustainable, recyclable material, which is biodegradable, and has low embodied energy. It does not endanger the health of people or the environment, and does not require protection to install, unlike fiberglass insulation. Wool is a highly effective insulating material which performs better than its rated R value because it can absorb and release moisture. Mongolian nomads used felted and woven sheep