Roof fade’s Just As Any Other Paint Fade,

When substance like water, pollution, and chemicals in the atmosphere, specifically environment react with the pigment of the paint.

In other words the pigment begins to break down and becomes chalking this causes the colour of the paint to change. Or

When a panel exposes to sunlight or UV rays, the resin begins to break down, once the resin start to break down and continues to expose to sun, oxygen, and other pollution it loses its adhesion to the surface and reacted.
And Those degraded particles begins to turn whitist.

Keywords

Chalking: It is the whitist residue that can become visible on the painted or coated metal surface over time.

Resin: it is the ingredients or the chemical component that protects and preserves the colour and provides added durability. It’s also bind the paint system to metal.

Factors Affecting Roofing To Fade

There are several factors that affect roofing to fade but the major ones are

1. Sunlight or UV rays, The degree of strength the panel exposes to the sun causes the resin or the chemical component of the paint to break down therefore changes its colour.

2. Temperature: frequent or fluctuation temperature weakens the pigment by manipulating the chemical make up of the paint thereby cause it to fade.