Final answer:
Granules on IKO cap sheet membranes protect against UV radiation, enhance durability, contribute to fire resistance, and provide aesthetic color options while also reflecting sunlight to reduce roof surface temperature, leading to potential energy savings.
Step-by-step explanation:
The purpose of granules on IKO cap sheet membranes is multifaceted. These granules are embedded into the cap sheet to provide protection from the UV rays of the sun, which can cause the membrane to deteriorate over time. The granules also contribute to the membrane's fire resistance, improve its durability, and offer a variety of colors for aesthetic purposes. Furthermore, they aid in reducing the surface temperature of the roof by reflecting sunlight, which in turn can lead to energy savings by minimizing the heat gain within a building.