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Rigid fiberglass insulation board is a high-density thermal and acoustic material used extensively in HVAC, mechanical systems, commercial buildings, and industrial equipment. Compared with loose fill fiberglass, these boards provide dimensional stability, predictable R-values, and smooth installation across flat and irregular surfaces.
Structured panel format provides uniform density
Lower risk of air gaps
Better performance in ducts and mechanical spaces
Suitable for OEM fabrication and lamination
Rigid fiberglass insulation is widely used where engineers require:
Thermal efficiency
Fire safety (noncombustible fiber matrix)
Sound attenuation
Lightweight installation
Moisture and mold resistance
Made from interwoven inorganic glass fibers, the material maintains thermal stability and does not settle over time.
Boards typically range from 3–12 lb/ft³:
Low density for acoustic panels
Medium density for HVAC ducts
High density for industrial machinery
Many applications require specialized facings:
Foil for vapor barriers
FSK (Foil-Scrim-Kraft) for mechanical rooms
Black or white mat for exposed ceilings
Maintains R-value even under mechanical vibration or temperature swings.
Ideal for sound control in:
Mechanical rooms
Air handling units
Auditoriums and studio applications
Fiberglass fibers are noncombustible and resist mold growth, making them suitable for demanding environments.
Rigid fiberglass insulation board is a standard for interior duct lining and exterior duct wrap due to its thermal and acoustic properties.
Applied on compressors, turbines, pumps, and high-temperature housings to control heat loss and noise.
Mechanical rooms benefit from Class A fire ratings, while commercial ceilings use fiberglass panels for acoustics.
Foam board offers higher initial R-value but:
Melts under heat
Produces smoke
Lacks acoustic absorption
Rigid fiberglass is better for fire safety and sound performance.
Mineral wool is denser and more moisture resistant, while fiberglass is lighter and easier to cut, with better acoustic properties.
Use a sharp utility knife or insulation saw.
Boards may be attached using:
Mechanical fasteners
Adhesives
Pins and washers
Foil facings must be oriented toward the warm-side environment when used as a vapor barrier.
For cutting details, reference the GTOFRP guide on how to cut FRP or insulation panels.
Higher density increases both thermal stability and cost.
Foil, FSK, fabric mats, and custom laminations add to final pricing.
Costs remain competitive compared to foam board and mineral wool, especially for acoustic-thermal combined requirements.
Panels can be produced from ½ inch to 3 inches depending on thermal targets.
Aluminum foil, polyester mat, or woven fabric can be added for specific building codes.
GTOFRP provides tailored insulation boards for:
HVAC equipment
Generator housings
Modular building systems
1. What is the R-value of rigid fiberglass insulation board?
Typically R-2.8 to R-4.3 per inch, depending on density.
2. Can fiberglass insulation boards be used indoors and outdoors?
Yes, with proper facing such as foil or weather-resistant laminates.
3. Are rigid fiberglass boards fire-resistant?
Yes. Fiberglass fibers are inherently noncombustible.
4. Is rigid fiberglass suitable for acoustic panels?
Absolutely—its fiber structure absorbs sound efficiently.
5. Does fiberglass insulation absorb moisture?
It resists moisture and does not support mold when kept dry.
Rigid fiberglass insulation board offers a reliable combination of thermal performance, acoustic absorption, and fire resistance for industrial and commercial environments. With customizable thickness, density, and facing options, GTOFRP supports engineering teams, HVAC contractors, and equipment manufacturers in specifying the right insulation solution for demanding projects.
Suggested navigation: explore GTOFRP's fiberglass insulation products, HVAC duct panels, and composite sheet solutions to support complete thermal system design.
