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Direct answer: If you see moss, algae or lichen on an Ogden or Davis County roof this fall, don’t scrub or pressure-wash it. Before snow, have gutters and valleys cleared by a pro, trim branches shading the roof, and check the attic for damp spots. Schedule a professional inspection if growth is thick, sits in valleys, or comes with leaks.
Why fall is the time to look
The NuRoof Guys Utah see the same pattern every October and November along the northern Wasatch Front. Leaves and needles drop, nights get colder, and shaded slopes stay damp longer. Then the first real snow covers everything until spring.
That makes the weeks before snow the best window to know what’s on your roof. Once a roof is under snow, you can’t see growth, debris or damage, and moisture trapped under leaf piles and moss just sits there through freeze-thaw cycles.
If you want the basics on what algae streaks, moss and lichen actually are, our earlier guide, Black Streaks, Moss and Lichen: What Biological Growth Means on a Utah Asphalt Roof, covers identification. This post is about timing: what to do on Ogden and Davis County roofs this season.
Which roofs in Ogden and Davis County get growth
Utah is drier than the Pacific Northwest, so biological growth is less common here. It still shows up in predictable spots:
- North-facing slopes. They get the least winter sun and stay damp and shaded the longest, especially once the sun angle drops in late fall.
- Bench and foothill homes. Lots on the Ogden east bench and the foothills above Kaysville, Farmington and Fruit Heights often sit under mature trees and near canyon shade.
- Roofs under big trees. Older neighborhoods in Ogden, Layton and Kaysville have tall shade trees that drop leaves and needles into valleys and gutters.
- Valleys and behind chimneys. Debris collects where two slopes meet or behind a chimney, holding moisture against the shingles.
A roof with growth isn’t automatically a failing roof. But growth tells you that part of the roof stays wet, and that’s worth a look before winter.
What to do before the first snow
Everything on this list can be done from the ground or handed to a professional. You don’t need to get on a ladder or on your roof for any of it.
- Look from the ground. Walk around the house on a clear day. Binoculars help. Note where you see green or dark patches, crusty spots or streaks, and which side of the house they’re on.
- Have gutters and valleys cleared. Clogged gutters and leaf-packed valleys are the biggest fall moisture problem. Hire a pro who works with proper fall protection.
- Trim overhanging branches. Letting more sun reach a shaded slope helps it dry. Use a tree service for anything near the roofline.
- Check the attic. From inside, look for damp insulation, dark spots on the roof deck or daylight where it shouldn’t be. Step only on framing, never on insulation.
- Watch the eaves after a storm. Staining or drips under the eaves after rain can point to backed-up gutters or moisture at the roof edge.
What not to do
Don’t pressure-wash a roof, and don’t scrub moss off with a brush or broom. As our earlier guide explains, roofing manufacturers warn that high-pressure washing and scrubbing can damage asphalt shingles. Wet roofs with growth are also slippery, which is one more reason to leave roof-level work to a trained crew.
Don’t apply chemicals you bought at a hardware store without checking your shingle manufacturer’s instructions and warranty first. And don’t assume a dark patch is just dirt. It could be algae, granule loss or storm wear, and each one points to a different next step.
When to call for an inspection
Call for a professional inspection before snow if you notice:
- Thick moss in valleys, along the eaves or behind a chimney.
- Growth together with a ceiling stain, attic moisture or a leak.
- Shingles that look lifted, curled or bare near the growth.
- Granules piling up in gutters or at downspouts.
- Growth that has spread noticeably since last year.
An inspection sorts what you’re seeing into one of three answers: Repair, Restore, or Replace.
- Repair fits when the problem is local, like a wet valley, a bad pipe boot or a few damaged shingles under heavy debris.
- Restore may fit when an asphalt roof is weathered but still sound. The NuRoof Guys Utah are an authorized GoNano installer in Utah, and we recommend GoNano roof treatment only when the inspection supports it. Restoration isn’t right for every roof. Where it does fit, warranty coverage is up to 15 years on qualified roofs, backed by a GoNano warranty; ask for written terms.
- Replace is the honest answer when shingles have failed across the roof. If you’re replacing on a heavily shaded lot, ask about algae-resistant shingle options.
Growth on its own isn’t a diagnosis. The inspection decides, not the streak.
Learn more about our role as an authorized GoNano installer in Utah.
GoNano is a trademark of its owner.
Schedule a free inspection before snow
The NuRoof Guys Utah inspect roofs across Ogden, Layton, Kaysville, Clinton and the rest of Weber and Davis County, with proper fall protection and photos of what we find.
- Call: 385-383-8479
- Email: [email protected]
- Schedule online: https://thenuroofguys.dripjobs.com/appointmentrequests
- The NuRoof Guys Utah, Utah license #14225732-5501
- Free inspection
Sources and further reading
Frequently asked questions
Should I remove moss from my roof before winter in Ogden or Davis County?
Don’t scrape or pressure-wash it yourself. Have gutters and valleys cleared and branches trimmed, then have a professional inspect thick or spreading growth before snow covers the roof.
Why does moss grow on the north side of my Utah roof?
North-facing slopes get the least sun, especially in late fall and winter, so they stay damp longer. Shade from trees or nearby foothills makes it more likely.
Can snow sitting on moss damage my roof?
Moss and leaf debris hold moisture against shingles. Under snow and freeze-thaw cycles, that moisture can’t dry out, so it’s best to clear debris and check problem areas before winter.
Is it safe to pressure-wash algae or moss off my roof?
No. Pressure washing and scrubbing can damage asphalt shingles, and wet roofs are slippery. Leave cleaning and roof-level work to trained professionals.
Does moss or algae mean I need a new roof?
Not by itself. An inspection shows whether the roof needs a local repair, may be a candidate for restoration, or needs replacement. Restoration isn’t right for every roof.
When should I call for a roof inspection in Ogden or Davis County?
Call before the first snow if you see thick moss in valleys, growth near a leak or attic moisture, lifted or bare shingles, or heavy granules in your gutters.