The answer to 'what causes soffit' is that soffit refers to the underside of the overhanging portion of a roof. Soffit can become damaged or deteriorated for several reasons, including:
Moisture and water damage: Leaks, poor ventilation, or high humidity can cause the soffit material to rot, warp, or become moldy over time.
Sun and weather exposure: Prolonged exposure to the elements like sun, wind, and rain can cause the soffit to fade, crack, or peel.
Pest infestations: Insects, birds, or rodents can burrow into or nest in the soffit, causing holes and other structural damage.
Improper installation: If the soffit was not properly installed or sealed, it may become loose, sag, or pull away from the roofline over time.