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  4. Insulation Properties
  5. Thermals

Thermals Perfromance

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
Roof system calculation


 




 
  • 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


For more information on thermals visit http://www.isover.com
 

THERMAL CONDUCTIVITY, (K / λ - VALUE)
 
  • 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

 
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Thermal Comfort

Thermal

R-value

R-value
R-value
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