Final answer:
Fiberglass batts are thick insulation material cut to fit between framing members and are assessed by the R factor, which calculates resistance from thermal conductivity and thickness.
Step-by-step explanation:
The insulation material described is often referred to as fiberglass batts, and it plays a crucial role in controlling heat transfer in buildings. When it comes to insulation efficiency, the R factor is a significant measurement, indicating the material's resistance to conductive heat transfer.
The strength of the R factor depends on two variables: the thermal conductivity (k) and the thickness (d) of the insulation material. A small k value and a large d result in a high R factor, equating to better insulation performance.
Typically, walls are insulated with 3.5-inch batts, exemplifying an R factor of 11, while ceilings, which are more prone to heat loss, often use 6.5-inch batts, resulting in a higher R factor of 19. These measurements help maintain the internal environment of a structure by reducing heat flow through the building envelope.