Abstract: A composite element for use as an insulating and/or construction means, where at least one layer is configured in the form of a foam layer, and where the foam layer comprises a foam material comprising a natural, renewable raw material; methods of using composite elements for thermal and/or acoustic insulation, including of buildings and/or roofs, and in the installation of heating and/or utility systems, including in floors and/or walls of buildings; an in-situ foam as well as a particulate foam material in loose filling for use as an insulating means; and an installation panel.