Roofing in Union City, CA

Serving Union City and Surrounding Areas

Common Roof Problems in Union City

Union City sits between dry inland heat and bay fog, so the same roof takes sun damage in August and storm-driven water in January. The mid-century ranch homes in Alvarado and the flat-roof Eichler tracts around the BART station were built to a different standard than anything we install today.

• Ceiling stains after rain — water seeps past worn step flashing at a chimney, wicks through old roofing felt, and saturates the roof deck; left alone it rots plywood sheathing and ruins attic insulation.
• Curled and cracked shingles — years of UV exposure dry out the asphalt and you find granule loss in the gutters; the next windstorm lifts fasteners and pulls field course shingles loose.
• Flat-roof ponding near Dyer Street — low spots on Eichler-era built-up roofs hold water against the membrane until it delaminates and blisters, which becomes a systemic leak over the living room.
• Clogged gutters and downspouts — grit and leaves pack the channel, water backs up under the drip edge, and the fascia and soffit board decay from the back side.
• Moss and algae streaks — low humidity slows growth, but shade on north-facing slopes still lets moss lift shingle edges and hold moisture against the underlayment.
• Sagging roofline and rafters — a stubborn leak softens a ridge beam or truss end and the roofline settles, which is structural rather than cosmetic.
• Loose ridge cap and cracked pipe boots — heat cycling splits the sealant and lets rain in around vent flashing, where mastic alone will not hold.