Why is fiberglass the preferred material for most batt insulation?

Fiberglass is preferred for most batt insulation primarily due to its lightweight nature combined with excellent insulation properties. Being lightweight makes it easier to handle and install, which is a significant advantage for both professional installers and DIY homeowners. Additionally, fiberglass has a high R-value, which measures its thermal resistance. This means that it effectively slows down heat transfer, making spaces more energy-efficient by keeping heat in during colder months and out during warmer months.

While cost and environmental considerations are important, the combination of lightweight handling and superior insulation performance primarily drives fiberglass's popularity as a batt insulation material. It is crucial to note that, although fiberglass is durable and offers ease of installation, these traits are secondary to its fundamental insulation benefits. Furthermore, while there are environmentally sensitive options available, fiberglass itself is often made with recycled materials which may not make it a primary environmental choice relative to its thermal efficiencies.