If you’re a homeowner in cities like Portland, Seattle, Vancouver, or even on the East Coast in places like Boston or New York, where damp climates are common, dealing with moss growth is a persistent and costly issue. Sure, moss-covered roofs may look charming, but moss retains moisture, weakens roofing materials, and can lead to expensive repairs if left untreated.
To help you protect the health and longevity of your roof—whether it’s a cozy cottage, modern townhouse or a single-family home—we interviewed industry experts who shared their insights in this Redfin article on nature’s green rug, the best ways to remove moss from your roof, and how to prevent it from returning.
Why moss grows on roofs in the first place
If your roof gets little sunlight—especially if it’s under trees or facing north—you’re more likely to see moss buildup over time. Patrick Roden of On Top Home Services explains, “Moss thrives in cool, damp areas with limited sunlight, like shaded roofs where moisture is retained.”
Moss spreads through windblown spores, meaning even if you clean your roof, new spores can still settle. Roden also notes that leaves and branches trap moisture, further fueling moss growth. Certain roofing materials, like asphalt shingles filled with calcium carbonate, are particularly vulnerable to moss. “Moss can cling to shingles and other materials and retain water, which can lead to the growth of fungi and accelerate roof decay,” he warns.
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Renovating your home?
Find out what your home’s worth, edit facts, and see the impact of home projects.
Is moss really that bad for your roof?
Moss may seem harmless, but it can cause serious damage to your roof. Chris Sloan of Sloan’s Home Solutions explains, “Moss retains moisture and can cause roofing materials to deteriorate faster. Over time, it can lead…