Health, comfort, energy use and sustainability issues related to the use of biobased building materials : to what extent are the effects supported by science and data? : what are next steps to take?

With the exception of wood, the use of natural (biobased) materials (based on hemp, flax, straw or other natural resources) is still limited. Nevertheless, many benefits are attributed to these materials in terms of a healthier and more comfortable indoor climate. Other potential benefits of natural insulation materials that are often mentioned are energy savings and reduced environmental impact. This report focuses on the empirical support for these claims, identifies research gaps and suggests, where appropriate, recommendations for next steps.