Fiberglass Insulation
Fiberglass insulation is one of the most common and cost-effective insulation materials used in residential and commercial construction, providing thermal and acoustic performance.
Composition
Silica-based material with additives for specific performance characteristics
Properties
R-Value
R-2.9 to R-3.8 per inch
Provides moderate thermal resistance, with effectiveness dependent on proper installation.
Density
0.5 to 1.0 lb/ft³
Lightweight material that comes in different densities for various applications.
Fire Resistance
Class A (ASTM E84)
Non-combustible material that doesn't burn or support combustion.
Sound Absorption
NRC 0.90-0.95
Excellent sound absorption properties, reducing noise transmission between spaces.
Moisture Resistance
Low to Moderate
Can absorb moisture, which reduces effectiveness and may lead to mold growth.
Lifespan
20-30+ years
Long-lasting when properly installed and kept dry.
Applications
Wall Cavity Insulation
Installed between wall studs in batts or rolls to provide thermal and acoustic insulation in exterior and interior walls.
Attic Insulation
Laid between and over ceiling joists to reduce heat transfer through the roof, available in batts or loose-fill form.
Floor Insulation
Installed between floor joists to insulate against cold from below or to provide sound insulation between floors.
HVAC Duct Insulation
Wrapped around ducts to prevent energy loss and condensation on cold surfaces.
Acoustic Treatment
Used in walls, ceilings, and specialized acoustic panels to absorb sound and reduce noise transmission.
Pipe Insulation
Wrapped around pipes to prevent heat loss, freezing, and condensation.
Advantages
- Cost-effective compared to many other insulation options
- Widely available and familiar to contractors
- Non-combustible and doesn't support fire spread
- Excellent sound absorption properties
- Doesn't settle significantly over time when properly installed
- Available in various forms (batts, rolls, loose-fill) for different applications
- Can be manufactured with recycled glass content
Limitations
- Can cause skin, eye, and respiratory irritation during installation
- Requires proper protective equipment during handling
- Performance is highly dependent on proper installation without gaps or compression
- Absorbs moisture, which reduces effectiveness and can lead to mold growth
- Lower R-value per inch compared to some alternatives like spray foam
- Can be damaged by pests and rodents
- Requires vapor barrier in many applications to prevent moisture issues
Sustainability Profile
Glass is infinitely recyclable without quality degradation, though production is energy-intensive. Its ability to harness passive solar energy in buildings can offset energy costs over time.