Check Flat-Roof Drainage Before California Winter Rain

Before winter rain, confirm that drainage paths are clear and ask a professional to assess visible damage or water-entry concerns. Do not access the roof yourself if it is wet, high, or not designed for safe access.

Check drainage and visible warning signs

From a safe location, look for blocked or damaged drains, scuppers, or gutters and for debris that could obstruct the path water needs to take. After rain, note any water that appears to remain in the same area, but do not use a single observation to diagnose a defect. The roof’s design, drain layout, and inspection findings matter.

Inside, watch for new ceiling stains, dampness, or recurring moisture near the roof. Take dated photos from a safe location and share them with the contractor.

The California Coastal Commission recommends checking roofs for wear or damage and clearing drains and gutters before severe weather (California Coastal Commission guidance). FEMA’s property-preparation guidance also emphasizes keeping gutters and downspouts clear (FEMA).

Questions for a roofer

• Are drains, scuppers, and drainage paths clear and functioning?
• Is there visible damage to the roof covering or details around penetrations?
• Does the observed condition need repair now, or should it be monitored?
• What areas are included in the written scope?
• Could concealed damage change the proposed work?

Do not assume every low-slope roof needs replacement because a wet winter is forecast. Ask for an assessment and a clear explanation of the options. See Green Conception’s roofing page or roof quote page.