South-facing slopes, valleys under trees, anywhere the winter sun never quite reaches — that is where Christchurch roofs go green first. Spores land, damp winters feed them, and moss and lichen spread slowly across tiles, iron and shingles, holding moisture against the surface around the clock.
Why it matters
Growth lifts edges, works roots into coatings and keeps the roof damp long after rain stops. A roof that cannot dry out ages faster — what starts as discolouration ends as premature replacement.
The fix
Treatment first, so the growth dies at the root and releases, then a measured washdown that takes the roof back to clean without damaging the surface. Most shaded roofs in Christchurch benefit from treatment every couple of years. If yours is going green, send a photo via Bark and I will tell you what it needs.