
Moss on the chimney and mortar that never dries?
- Moss or green film on the crown and shaded faces
- Masonry that stays visibly damp from October to May
- Rust creeping across caps and screens
Why it happens in Oregon: Western Oregon's chimney problem is patient water: moss holding moisture on crowns, mortar that never dries between October and May, metal rusting from the wet side out. Frost is rare; rot and saturation are not. The post-winter look, in the brief dry season, is the one that counts.
What fixes it, and what it costs
In maritime rain the enemy is patient water, not sharp frost: moss holds moisture against the crown, joints stay saturated, metal rusts from the wet side out. The maintenance that works is seasonal: moss off and crown checked in the brief dry window, repairs cured while cure is possible, stainless for the metal, and a breathable repellent once the masonry is sound and dry.
- Flexible seal over a sound crown
- $200–$500
- Localised patch repair
- $300–$700






















