Path-Q Solar

How can I determine whether an installer has accounted for roof drainage in the proposed layout?

Answer

Ask the installer to overlay the array on the roof’s drainage features and explain how water flows around panels, attachments, walkways, penetrations, gutters, drains, scuppers, and service areas without creating ponding or obstructing maintenance.

Key points

  • Request roof plans or marked-up drawings showing slopes, valleys, drains, gutters, scuppers, and downspouts.
  • Ask how attachments and cable routes avoid blocking or redirecting water.
  • Confirm that access paths and future repair zones preserve drainage.
  • Have the installer identify any assumptions requiring a roofing or structural professional.

What it depends on

  • Roof slope, membrane or covering, drainage design, and condition
  • Array, racking, attachment, and cable layout
  • Site-specific building and installation requirements

Risks and trade-offs

  • A layout that maximizes panel area may interfere with drainage or roof maintenance.
  • Poor drainage planning can contribute to leaks, ponding, corrosion, or difficult repairs.
  • Redesigning after roofing work may cost more than preserving drainage space initially.

Information you may need

  • Roof and drainage drawings
  • Installer’s attachment and cable-routing plan
  • Roof inspection or condition report
  • Any known history of ponding or leaks

Your next step

What to do next

Ask for a drainage-overlay drawing and written confirmation that the layout preserves existing drainage paths and service access.

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SQ02087