Traditional heavyweight construction methods provided buildings with small windows and thick walls (and therefore high thermal mass) that feel cool even on the hottest day because they warm up slowly and have limited temperature fluctuations between day and night. Modern building design calls for efficient use of materials and large windows for a brighter environment.  These buildings from lightweight construction methods often have poor thermal mass characteristics and tend to quickly heat up and cool down beyond the comfortable temperature range if left uncontrolled. External, energy intensive cooling or heating is therefore required to create a comfortable environment all year-round. CrodaTherm bio-based phase change materials can be applied to lightweight building methods to “put back in” high thermal mass characteristics.