Roof Lichen Treatment on Vancouver Island

Lichen is the slowest-growing roof organism — colonies visible to the naked eye are typically 3–8 years old. If you can see lichen from the ground, it has been established for years. Early treatment prevents the deep rhizine penetration that older colonies develop.

Both types cause structural damage through rhizine penetration. Xanthoria (orange) often indicates south-facing exposure with higher UV — which means the shingles beneath are also UV-stressed. Physcia (grey) is more common in persistently damp, shaded areas where wood rot co-exists with lichen.

One professional treatment is sufficient for most lichen infestations. For severe, multi-decade accumulations (common on older Victoria and Oak Bay cedar roofs), Roof Labs Canada may recommend a follow-up application at 90 days. Both are included in our 2-year guarantee.