While the Bay Area is known for its moderate winters, your roof can still face serious challenges during the colder months. From unexpected rainstorms to powerful winds, winter can expose underlying weaknesses in your roofing system — leading to leaks, water damage, and costly repairs.
At Roof by Tom, we’ve seen it all. With over 20 years of roofing experience across San Francisco, Oakland, Martinez, Concord, and surrounding cities, we know what to look for and how to protect your home before damage spreads.
Here are the most common winter roof problems we repair each year — and what you can do to stay ahead of them.
1. Leaks from Clogged Gutters or Flashing Failure
Clogged gutters are one of the leading causes of winter roof leaks. When leaves and debris build up, water overflows and backs up under your shingles or roof edge. Pair that with failing or rusted flashing (the thin metal that seals roof joints), and you’ve got a perfect recipe for ceiling stains, mold growth, and even wood rot.
Prevention Tip: Clean your gutters in late fall and inspect flashing before winter storms roll in.
2. Wind-Damaged Shingles
While the Bay Area doesn’t often see snow, it does get sudden wind gusts — especially in coastal and hillside neighborhoods. Wind can loosen or rip off shingles, leaving your roof deck exposed to rain and moisture. Missing shingles are a fast track to internal damage if not repaired promptly.
If you notice shingles in your yard or uneven patches on your roof, schedule a repair right away.
3. Pooling Water on Flat Roofs
Flat or low-slope roofs are especially vulnerable in the winter. If drainage isn’t properly maintained, rainwater can poolon the surface, leading to membrane damage, leaks, and even structural sagging. This is common on modern homes and commercial buildings in the Bay Area.
Roof by Tom provides specialized repairs and coatings for flat roof systems, including TPO and modified bitumen.
4. Ice Dams in Colder Inland Areas (e.g., Martinez & Concord)
While not as common along the coast, ice dams can form in colder inland locations like Martinez, Concord, and Walnut Creek, especially on north-facing or shaded roofs. Ice dams occur when heat escapes through the attic, melts snow, and then refreezes at the roof edge — trapping water and forcing it under the shingles.
Solution: Proper attic insulation and ventilation can reduce the risk of ice dams, and we can help retrofit your roofing system accordingly.
5. (Question) Can Roof Repairs Be Done During the Winter?
Yes — and in most cases, they should be. Waiting until spring can make a small problem worse. At Roof by Tom, we perform safe and effective winter roof repairs using techniques and materials suited for colder, wetter conditions. We also offer emergency tarping and leak control for active issues.
Book a Winter Roof Inspection Now »
Don’t Wait for the Damage to Spread
If you notice signs of roof trouble this winter — even a small leak or a loose shingle — don’t ignore it. Acting early can prevent structural damage, indoor mold, and thousands in future repairs.
📍 Serving San Francisco, Oakland, Martinez, Concord, and surrounding Bay Area cities
📞 Call today or schedule your free winter roof assessment