Fiberglass is a type of fiber primarily composed of glass that is used in a wide variety of applications, and is predominantly employed as a residential and commercial thermal insulator. Fiberglass is also used to create products as varied as automobile bodies, boat hulls, arrows, roofing, shower curtains, and tent poles.

As an insulator, it slows the spread of heat, cold, and sound in structures, cars and aircraft. By trapping pockets of air, it keeps rooms warm in the winter and cool in the summer and thereby serves as a convenient method to increase energy efficiency.

Fiberglass can be a practical insulation option in suitable assemblies. Compare the specified product and any facing, its tested fire performance, fit, and required protective layers. Actual energy savings depend on the complete building, not the material name alone.

Benefits of Spray Foam Insulation include the following:

Lowers energy costs for both heating and cooling
Excellent at trapping heat
Highly effective at reducing sound
Non-combustible and non-absorbent
Does not wear out or lose efficacy over time
Light weight and cheap cost to manufacture

Commonly found in blanket form, called batts, it is available in bags containing standard pre-cut lengths and widths. Batts are typically stapled into place. It also comes in bags as loose fill that can be blown into attic, wall and floor cavities.

Most fiberglass batts are manufactured with a paper or foil backing that faces the direction of warmth. When installed correctly, it creates a continuous membrane that retards the passage of moisture and reduces the likelihood that fibrous particles will enter the living space. It is important that the backing always faces the warm side of the structure in which the insulation is installed.

Batts are available in different thicknesses, with the thicker batts offering a higher resistance to heat flow. This resistance is known as R-value, with common R-values for walls being R11 to R19, and R30 to R38 for ceilings.

How does fiberglass insulation improve energy efficiency?

Fiberglass limits heat transfer when correctly fitted at the specified depth without gaps or compression. Air sealing and the condition of the building also affect comfort and energy use; a fixed utility-bill reduction is not guaranteed.

What is an R-value, and why is it important?

R-value measures the resistance to heat flow. The higher the R-value, the better the insulation performance. Common R-values:

Walls: R11 to R19
Ceilings: R30 to R38

How does insulation help with energy efficiency?

Insulation traps pockets of air, keeping rooms warm in the winter and cool in the summer. This reduces the need for excessive heating or cooling, leading to lower energy bills and a more eco-friendly home.

What types of insulation are available?

Insulation is commonly available in blanket form (batts) and as loose fill that can be blown into attics, walls, and floors. Batts come in pre-cut lengths and widths, often with a paper or foil backing to prevent moisture buildup.

How is insulation installed?

Batts are typically stapled into place, while loose-fill insulation is blown into cavities using special equipment. Proper installation ensures a continuous barrier that maximizes energy efficiency and prevents air leaks.

Air Sealing alone in your home doesn’t eliminate the need for proper insulation to reduce heat flow through the building envelope.

Reducing the amount of air that leaks in and out of your home is a cost-effective way to cut heating and cooling costs, improve durability, increase comfort, and create a healthier indoor environment. Caulking and weatherstripping are two simple and effective air-sealing techniques that offer quick returns on investment, often one year or less. Caulk is generally used for cracks and openings between stationary house components such as around door and window frames, and weatherstripping is used to seal components that move, such as doors and operable windows.

Air leakage occurs when outside air enters and conditioned air leaves your house uncontrollably through cracks and openings. It is unwise to rely on air leakage for ventilation. During cold or windy weather, too much air may enter the house. When it’s warmer and less windy, not enough air may enter, which can result in poor indoor air quality. Air leakage also contributes to moisture problems that can affect occupants’ health and the structure’s durability. An added benefit is that sealing cracks and openings reduces drafts and cold spots, improving comfort.

Planning this insulation work

Fiberglass can be considered for accessible walls, ceilings, and floor framing. In a retrofit attic, compare the plan with blown-in attic insulation and identify the air sealing needed before installation. We assess these options for properties across our local service area.

Fiberglass Insulation Services in East Alabama & West Georgia: Reduce Energy Costs & Improve Comfort