We would like to determine which elements of building are to be renewed or changed. Among other things, we want know which elements are subject to a specific heat transfer.
Does exist a measuring method to determine the real existing value of thermal transmittance (W/(m²·K)) or R-value ((m²·K)/W) of a bulding component (e.g. wall, roof, window glass, window frame, ...)? And what accuracy is there?