Moss gets on roofs primarily through airborne spores that land and take root in favorable conditions.
Here's a breakdown of the process:
- Spore Dispersal: Moss reproduces via spores, which are tiny, single-celled reproductive units. These spores are extremely light and easily become airborne.
- Airborne Travel: Wind, rain, and even animals can carry these spores over long distances.
- Landing on the Roof: Eventually, some spores will land on a roof. The texture of roofing materials like shingles provides a surface for them to adhere to.
- Favorable Conditions: For a spore to develop into moss, it needs moisture, shade, and a slightly acidic environment. Areas between shingles, under trees, or on the north-facing side of a roof are particularly susceptible.
- Growth and Establishment: Once the spore finds a suitable spot, it germinates and begins to grow. Moss acts like a sponge, absorbing rainwater. This can damage the roof over time, especially by weakening the shingles as it grows and spreads.
In summary, moss arrives on roofs as airborne spores, establishing itself in damp, shaded areas and growing into visible moss colonies.
