Your Ceiling Insulation R-Value

By using ceiling insulations with the correct ceiling insulation r value, you can have a comfy home.

During winter, such homes will remain warm while during the summer, the house will not heat up. This saves energy and hence money.Material used to make a ceiling insulation also greatly affects the insulation property. Most materials which are good thermal conductors normally have lower r value while materials that are poor thermal conductors have higher r value.

The Technical Information on R-values

R-value – or more commonly known as Thermal Resistance is an indication of the products performance. A higher R-value will mean a better insulating affect the insulation will have.

  • R-value = Thickness of the material
  • K-value= Its Thermal Conductivity

The K-value is determined in an accredited laboratory and the thickness of the product is determined by the manufacturer.

A sample of the product will be produced by the manufacturer at a stated density (weight) and will be sent to the laboratory for testing. What needs to be achieved here, is a low K-value (thermal conductivity). The product needs to be a bad conductor of heat flow.

Once the results come back for the k-value, the R-value can measured effectively, example:

A 50mm blanket that has a tested K-value of 0.046:

Thickness 0.05/ K-value 0.046 = 1.08 R-value

As long as the same thickness is used by the manufacturer in his range at the same density as the submitted sample, he can use the same K-value and formula to determin the R-values.

thermal insulation

A 100mm blanket example:

Thickness 0.1 / Tested K-value 0.046 = R-value 2.17

The determined R-value’s in the above examples are the product R-value. Remember that the ceiling and roof tiles as well as other roofing materials also have a small insulating affect. So the total R-value of both the insulation materials and the roofing materials must be considered. If you have a 2.17 R-value from the insulation material, and a 0.53 R-value from the roofing materials, you get a total R-value of 2.7.