Heat Loss Prevention Through Insulation
Basically definition of Batt Insulation: Type of insulation, which consists of a rigid fiberglass material such as a blanket, that is stuffed with a vapor barrier. The fiberglass can have the best insulation attached to it, or just the fiberglass alone can just be fiberglass. This is one type of insulation used in homes. This insulation is mostly found in wall cavities and attics.
The thermal resistance
of this fiber material depends on the vapor permeability properties of the fibers. Generally, fiberglass is treated so that it becomes impermeable to water vapor and thus increases the insulating effect. But then it also tends to reduce the thermal conductivity of the material, because of the presence of water vapor. But this is usually compensated by an increased R-value, which means it has a higher thermal conductivity. There are three types of fiber structures available for insulation; polyethylene (PE), polystyrene (PS), and extruded expanded polystyrene (EPS).
All these fiberglass insulation materials
are installed in a wide variety of building applications. For instance; fiberglass insulation made of cellulose is used in Class I and II buildings and attics. But then it reduces the energy effectiveness. In Class III and IV buildings, this type of insulation is recommended. So for the overall thermal performance of this type of insulation is not suggested. But for the heating and cooling systems which are not important in Class III and IV buildings, this type of insulation is very efficient.
In this classification insulation works
on the principle of convective heat transfer. It uses tiny air packets to move from outside to inside. So through this process, it effectively captures the heat energy and then moves it to either inside or outside walls. As far as the size of the air movement is concerned, the small pores lead to the slowest transfer of heat to the interior of the building.
The R-value per inch
is the basis of determining the amount of thermal resistance, the more the r-value per inch the more effective the insulation. For instance; a building constructed with one-inch thick insulation will have greater thermal resistance than a building constructed with ten-inch thick insulation. Another factor that affects the R-value per inch is the type of fill layer. There is no standard type of insulation. But generally, there are three types of insulation; blown-in, fiberglass batt insulation, and loose-fill.
The blown-in type of insulation
is designed to prevent heat transfers during the winter season. But it increases heat losses. Moreover, it also brings down the R-value per inch. Fiberglass is a good insulator and provides thermal resistance. But it is a little bit expensive. Last but not the least; polyurethane foam insulation is also a good insulator but has many shortcomings.