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Fiberglass Insulation

What is Fiberglass Insulation?

Fiberglass – which consists of extremely fine glass fibers – is an insulation material that is found in most homes.

It is commonly used in two different types of insulation, which are batts and rolls, and loose-fill. It is also available as rigid boards and duct insulation.

Currently, manufacturers produce medium- and high-density fiberglass batt insulation products that have a slightly higher R-Value than standard batts. Fiberglass can be placed in unfinished walls, floors, and ceilings. It is fitted between studs, joists, and beams.

Fiberglass is made to slow the spread of heat and cold in both residential and commercial insulation projects. Fiberglass makes for a good option for homeowners looking to save a few dollars or do the installation as a do-it-yourself project.


How Fiberglass Insulation Works

Fiberglass as an insulator slows the spread of heat, cold, and sound in structures.

The material does this by trapping pockets of air, keeping rooms warm in the winter and cooler in the summer, according to the International Association of Certified Home Inspectors (InterNACHI).

Limiting the amount of air coming into and leaking from a home can work to make a home comfortable. It's important to note that fiberglass limits air movement, but doesn't stop it completely.

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What is R-Value?

R-Value is the capacity of an insulating material's resistance to heat flow.

Basically, that means the higher the R-Value, the greater the insulating power of the material. While R-Value is something that is good to know, it’s not the revered determiner for all things insulation.

The amount of insulation you need to hit the R-Value required where you live is determined by your region's climate zone. For example, a colder state like Michigan will require a higher R-Value when compared to a warmer state like Florida.

Fiberglass insulation can get you to the higher R-Value you need to achieve because you can double and even triple the material.

Now, reducing insulation to a number doesn’t tell the whole story, since heat flows in and out through radiation and convection. Heat loss through convection, or airflow, can account for nearly 40 percent of total energy loss in the home.

This is an issue if you are only using R-Value to choose your insulation and not looking at the performance of other insulation materials.

Sep 19, 2022