Insulation Panel Insulation Values
The insulation thickness of a profiled roof panel varies from 30 mm to 300 mm. To achieve the same insulating value as a flat panel, a profiled roof panel needs to be thicker. The through fasteners or fixing clips are thermal bridges, but it has been shown that these are unlikely to decrease the R-value by more than 2%.
Different cores will also have different values for thermal insulation and noise attenuation, as will the details of panel joints and interfaces with other materials.
The nett insulation value of a panel must be calculated and stated by the manufacturer.
Since we say it won't increase by more than...we can stay with the top value.
R-values are the reciprocal of U-values. We will stick with R-value because that is the most commonly used value for roofs and walls.
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