The risk of condensation in the roofing system is a major concern in any proposed built-up by the designer. Moisture entrapments and condensation inside the roof will lead to accelerated corrosion, reducing the lifespan of the roof.

EP uses software to calculate the risk of interstitial condensation forming at the interfaces of layers within an element in accordance to BS 5250:2002, code of practice for control of condensation in buildings. The method of analysis is defined in BS EN ISO 13788:2002.