Mineral Wool thickness needed to match ThermaCote® performance at 1mm
In this article we show how ThermaCote® compares to Mineral Wool insulation. You might be surprised just how much thinner ThermaCote® application is compared to the equivalent in Mineral Wool!
Published: Mar 8, 2025
Author: ThermaCote® UK
Thermal Conductivity of Rockwool Products
- ThermalRock S Series:
- S40 (Density: 40 kg/m³): λ = 0.037 W/m·K
- S50 (Density: 50 kg/m³): λ = 0.036 W/m·K
- S60 to S100 (Densities: 60-100 kg/m³): λ = 0.036 W/m·K
- Thermal Insulation Roll:
- Density: Not specified
- Thermal Conductivity: λ = 0.044 W/m·K (source rockwool.com)
ThermaCote’s R-Value at 1mm
ThermaCote achieves an R-value of 1.87 m²·K/W at a 1mm thickness.
Calculating Required Thickness to Match ThermaCote’s R-Value:
To determine the necessary thickness of Rockwool to match this R-value, we use the formula:
Thickness = R x λ
Applying this:
For ThermalRock S50 (λ = 0.036 W/m·K):
- Thickness = 1.87m².K/W x 0.036W/m.K
- = 0.06732m or 67.32mm
For Thermal Insulation Roll (λ = 0.044 W/m·K):
- Thickness = 1.87m².K/W x 0.044W/m.K
- = 0.08228m or 82.28mm
Comparison
As you can see, in comparison, ThermaCote offers excellent performance.
- ThermaCote’s R-value 1.87 m²·K/W at 1mm
- ThermalRock S50 equivalent R-value approximately 67.32 mm
- Thermal Insulation Roll equivalent R-value approximately 82.28 mm
