Understanding the thermal performance of insulation is imperative when choosing insulation.
ISOVER`S impressive array of thermal insulation, in either roll of batts is suited to almost every conceivable application.
Our thermal insulation is second to none offering a wide range of R / lambda values.
Thermal performance of insulation
THERMAL RESISTANCE, (R - VALUE)
- The ability of a product to resist the transfer of heat
- To calculate the R value you need to know the Thermal Conductivity (K Value) and the thickness of the material being used.
(R value = Thickness in meters)
K Value
Calculation of R-Values for typical Roof/Ceiling Construction Products
- Total R-value of a construction element (Wall or roof) can be obtained by adding the R-values of the different components
- The higher the R value the better the products thermal resistance
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- All materials conduct heat, some better than others depending on their thermal conductivity. Good insulation materials must have a LOW conductivity.
- Eg. A material with a low conductivity allows heat from one side of a wall to travel very slowly towards the other side of the wall.
- Thermal conductivity is calculated in W/mK (Watts per meter Kelvin degrees). If you test two products with similar densities at the same temperature and one has a K value of 0.040 W/mk and the other has a K value of 0.045 W/mK, the material with the lower K value insulates better which means that the heat will travel slower from a higher temperature to a lower temperature until and equilibrium temperature is reached.
- The ability of a product to conduct heat
- Steel is a good conductor of heat (heat flows faster through steel)
- Wood is a poor conductor (heat flows slower through wood thus making wood a better insulator)
- Calculated in W/m.K (Watts per meter Kelvin degrees)
- K values of typical building materials
- The lower the K value the lower the heat flow through the product
