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All thermal insulation materials are rated for their performance
in restricting heat transfer. This rating is expressed as the R
Value, and is the measure of the materials resistance to heat
transfer (thermal resistance). It is a guide to its performance as
an insulator. The higher the R Value , the greater to insulating
effect.
R Values are expressed using metric units (m2.K/W) where:
•m2 refers to 1 square meter of the material (of a specified
thickness).
•K refers to degree Kelvin temperature.
•W refers to the amount of heat flowing across the material in
watts.
Products which have the same R Value will provide exactly the
same insulating effect as one another, provided they are correctly
installed. Remember, it is not the thickness of the insulation
product that counts; it is the R Value. Some products will resist
heat transfer more effectively and so will have a higher R Rating
for a given thickness.
Interpretation of "R" Value
When specifying or purchasing a product based on the "R" Value,
care needs to be taken to ensure the values of competing products
are rated under the same circumstances. For instance, is the R
Value an "Added" R Value" or is the value quoted the summation of
the system the insulation is being put into. As a general rule bulk
insulation is normally quoted either as a stand alone or Added R
Value, while those products with reflective surfaces are quoted on
a system basis.
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