Fiberglass Insulation

Fiberglass Insulation

Fiberglass insulation is a widely used thermal insulation material that provides reliable performance when installed correctly. It remains a practical option for many residential and light commercial applications where budget, accessibility, and assembly requirements make other insulation systems less suitable.

Structo Insulation installs fiberglass insulation as part of a complete insulation strategy, ensuring it is applied correctly and performs as intended within the overall building envelope.

Why Choose Fiberglass Insulation

Fiberglass insulation is manufactured from extremely fine glass fibers formed into batts, rolls, or loose fill. These fibers trap air within the material, slowing conductive heat transfer and improving thermal resistance.

When properly installed, fiberglass insulation offers consistent thermal performance and dependable fire resistance at a lower cost compared to higher performance systems.

Material Characteristics and Performance

Fiberglass insulation provides several inherent advantages:

Cost efficiency
One of the most affordable insulation materials available, making it suitable for large coverage areas and budget conscious projects.

Fire resistance
Fiberglass is naturally non combustible and does not contribute to flame spread.

Moisture behavior
Fiberglass fibers do not absorb water. However, performance can be reduced if the surrounding assembly allows moisture intrusion or air movement.

Acoustic control
Fiberglass provides moderate sound dampening, particularly in wall and floor assemblies.

Fiberglass insulation performs best when air movement is controlled through proper air sealing measures.

Common Fiberglass Forms

Fiberglass batts and rolls
Pre cut insulation designed to fit between framing members. Performance depends heavily on proper sizing, cutting, and placement.

Loose fill fiberglass
Blown into attics or cavities to provide uniform coverage. Proper depth and density are critical to maintaining target R value.

Ideal Applications

Fiberglass insulation is commonly used in the following areas:

• Attics: Loose fill or batt insulation provides a thermal blanket that reduces heat loss in winter and heat gain in summer. Air sealing at penetrations is critical to performance.
• Exterior wall cavities: Installed between studs in framed walls to improve thermal efficiency. Careful cutting and fitting are required to avoid gaps and compression.
• Floors and crawl spaces: Used to reduce drafts and stabilize floor temperatures when combined with proper vapor and air control strategies.

Fiberglass insulation is most effective when paired with appropriate air sealing measures.

Installation Quality Matters

Fiberglass insulation is often viewed as simple to install. In practice, improper installation is one of the most common causes of underperformance. Common installation errors include:

• Gaps around electrical boxes and plumbing
• Compression that reduces effective R value
• Misaligned batts that leave voids
• Poor fit in irregular or non standard framing

Structo Insulation installers are trained to install fiberglass insulation with precision. Materials are cut and fit carefully around obstructions, cavities are fully filled without compression, and installation is verified to ensure the intended thermal performance is achieved.

Request an Insulation Evaluation

Not every building requires spray foam. Not every building performs well with fiberglass alone. The correct solution depends on the structure, exposure conditions, and performance goals.

Request an insulation evaluation to determine whether fiberglass insulation is appropriate for your project and how it should be integrated into a complete insulation strategy.