Moss Growth

Moss thrives in damp, shaded conditions with limited airflow — making south-facing roof planes, shaded areas under overhanging trees, and valley channels prime locations for growth. Moss colonises the porous surface of concrete and terracotta tiles, as well as the joints and overlaps between metal roof sheets, where moisture lingers after rain. As moss grows, its root-like structures (rhizoids) penetrate into the tile surface, lifting the surface coating and creating micro-channels that increase water absorption. On tile roofs, moss growth can be structurally significant. Thick moss accumulations between tile courses can lift tiles off their battens, compromising the overlap and creating gaps for wind-driven rain to enter. Moss in valleys blocks the water flow path, causing water to dam up and overflow into the roof space. The weight of saturated moss also adds dead load to the roof structure. In Gippsland, moss growth is one of the most common aesthetic and functional issues affecting tile roofs. The region's relatively high rainfall, moderate humidity, and abundance of mature trees create ideal conditions for moss proliferation. Town & Country Roofing removes moss as part of the high-pressure cleaning stage of roof restoration, and the application of a roof membrane coating after cleaning creates a sealed surface that inhibits moss re-establishment for many years.