Path-Q Solar
How should roof drainage routes be preserved when placing solar panels?
Answer
Lay out panels and attachments so that existing slopes, gutters, drains, scuppers, valleys, channels, and overflow paths remain functional and accessible. The design should preserve water-shedding details, avoid creating trapped water, and allow inspection and maintenance of drainage components.
Key points
- Map drainage features before finalizing the panel layout.
- Do not block drains, scuppers, gutters, valleys, or overflow routes.
- Coordinate panel edges, racking, flashing, and conduit with drainage paths.
- Check the layout for runoff concentration and maintenance access.
What it depends on
- Roof slope, drainage design, and existing condition
- Panel and racking dimensions
- Attachment and flashing details
- Roofing warranty and applicable design requirements
Risks and trade-offs
- Blocked or altered drainage can cause ponding, leaks, corrosion, or roof damage.
- Leaving larger drainage clearances may reduce panel count.
- Routing conduit across drainage features can create maintenance and waterproofing problems.
Information you may need
- Scaled roof and drainage plan
- Locations of drains, gutters, valleys, and overflow paths
- Proposed panel, attachment, and conduit layout
- Roofing professional's review where drainage is complex
Your next step
What to do next
Ask for a dimensioned layout showing all drainage features and have the roofer or designer confirm that the proposed panels and attachments preserve drainage.
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