Workmanship and installation standards can strongly affect the thermal transmittance. The better-insulated a structure is, the lower the U-value will be.
Thermal transmittance, also known as U-value, is the rate of transfer of heat through a structure (which can be a single material or a composite), divided by the difference in temperature across that structure. U-value, or thermal transmittance (reciprocal of R-value) The various terminologies, and how they relate to one another, are explained in this article. A number of the terms have subtly similar meanings, and conflicting interpretations can be found across the internet.
U-value calculations will invariably be required when establishing construction strategies.
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