Thermal insulation in buildings is an important factor to achieving thermal comfort for its occupants. Insulation reduces unwanted heat loss or gain and can decrease the energy demands of heating and cooling systems. It does not necessarily deal with issues of adequate ventilation and may or may not affect the level of sound insulation. In a narrow sense insulation can just refer to the insulation materials employed to slow heat loss, such as: cellulose, glass wool, rock wool, polystyrene, urethane foam, vermiculite, perlite, wood fibre, plant fibre (cannabis, flax, cotton, cork, etc.), plant straw, animal fibre (sheep's wool), cement, and earth or soil, but it can also involve a range of designs and techniques to address the main modes of heat transfer - conduction, radiation and convection materials.
The effectiveness of insulation is commonly evaluated by its R-value. However, an R-value does not take into account the quality of construction or local environmental factors for each building. Construction quality issues include inadequate vapor barriers, and problems with draft-proofing. In addition, the properties and density of the insulation material itself is critical.
Read more about this topic: Building Insulation
Other articles related to "thermal insulation, insulation, thermal":
... applications, but in household situations (appliances and building insulation), air tightness is the key in reducing heat transfer due to air leakage (forced ... shown that for some systems, there is a minimum insulation thickness required for an improvement to be realized ...
... As a result, high temperature insulation is used, more commonly known as heat barriers, for exhaust heat management ... Thermal barrier ceramic-coatings are specifically designed to reduce heat loss from engine exhaust system components including exhaust manifolds, turbocharger casings, exhaust ... As well as providing thermal protection, these coatings are also used to prevent physical degradation of the composite due to frictional processes ...