Proper structural composition is a determining factor for the life expectancy of the roof. In conventional roof structures, insulation is placed below the waterproof layer and therefore membrane is isolated from rest of roof construction, thus exposed to wide temperature fluctuations which cause a failure. Therefore in inverted roof, membrane is placed on the top of the Synergy XPS boards which provide protection against factors such as UV-radiation, blistering of the membrane and temperature extremes, as well as a lower risk of failure.
