Under CopyrightKünzel, H.M.H.M.KünzelSedlbauer, K.K.Sedlbauer2022-03-038.2.20082007https://publica.fraunhofer.de/handle/publica/21425610.24406/publica-fhg-214256The long-wave, infrared (IR) exchange of radiation of building surfaces with their environment or within a building component is a thermal transfer which must not be neglected. The reduction of this thermal transfer by means of infrared-reflecting layers can contribute to energy savings. Unfortunately, this contribution is frequently overestimated in practice. The aim of this IBP Report is to clarify the potential of IR-reflecting layers from a hygrothermal point of view.en690journal article