Roofing in San Leandro, CA

Serving San Leandro and Surrounding Areas

Roof Problems Mill Valley Homeowners Actually Face

Two things drive most of the damage we find here: coastal fog that leaves the roof wet most mornings, and Pacific storms dropping heavy rain on hillside homes already shaded by redwoods and oaks. Add roofs that were last shingled twenty years ago, and water finds the weak point quickly.

• Fog-driven moisture at the eave — constant damp keeps the drip edge and the first field course wet, water wicks under the asphalt shingle, and rot moves into the fascia and plywood decking behind it.
• Flashing that has pulled away — where a gable or hip roof meets a chimney or dormer, step flashing and counter-flashing separate from the masonry, and the gap lets water seep down a truss bay and stain the ceiling below.
• Cracked pipe boots and vent flashing — the rubber collar on a pipe boot or vent boot splits after years of UV, and every storm sends water straight down the rafter and joist.
• Wood shake and cedar shake decay — older shake roofs in Cascade and Alto hold fog moisture, split at the nail line, and grow moss that lifts the staggered courses and lets water under the roofing felt.
• Gutters packed with redwood needles — gutter overflow backs up under the starter course, and the soffit and raking eave begin to peel and spall.
• Attic ventilation and insulation failure — a blocked ridge vent or a dead attic fan traps heat and moisture, which delaminates the synthetic underlayment and cooks the tar paper and bitumen from below.
• Ponding water on low-slope sections — on a flat roof over a garage or a mansard front, water sits at the scupper and coping, erodes the modified bitumen or PVC membrane, and turns into a systemic leak that travels sideways.