Common building boards are heavier than lightweight glass wool rolls, so supports and fixings must match the selected product.Key selling points:
- Grades with verified A 1 classification are available in the market for noncombustible material specifications.
- The porous structure absorbs sound within suitable assemblies.
- Cut-to-fit boards help fill cavities when installed and fixed correctly.
- Water-repellent options can reduce the effects of incidental water contact.
- Building and industrial grades can be selected separately for their intended duties.

Specification guide Property Selection guidance Density 12–48 kg/m³; compare conductivity and thickness as well as density Thickness 50 / 75 / 100 / 150 mm; 75–100 mm can be evaluated for tropical buildings, subject to design Thermal conductivity λ Approximately 0.032–0.040 W/(m·K) for selected grades; some low-density grades are around 0.041 or higher; verify mean test temperature Illustrative thermal resistance 100 mm at λ=0.036 gives material R≈2.78 m²·K/W, excluding thermal bridges and other roof layers Reaction to fire Select an unfaced grade with a verified A 1 classification where required; confirm the faced product separately Service temperature Grade-dependent; do not assume the blanket, binder, adhesive and facing are all rated to 200°C Moisture behavior Vapor-open; water ingress and condensation can impair performance Water repellency Hydrophobic grades may be specified; request the value and test method Water absorption Request the selected product’s short- or long-term test result and reporting units NRC Report for the actual thickness, facing and mounting; no universal value applies Dimensions and packing Confirm roll width, length, overlap tabs and compression recovery