Path-Q Solar
How should roof drainage be evaluated before installing panels on a low-slope roof?
Answer
Map existing drainage paths, drains, scuppers, gutters, overflow routes, ponding areas, and maintenance access, then verify that the proposed array and mounting system will not block, overload, or redirect water. Address drainage defects before adding solar.
Key points
- Inspect for ponding, blocked drains, membrane damage, and inadequate overflow protection.
- Show panels, supports, ballast, walkways, conduits, and equipment on a drainage plan.
- Check whether mounting changes roof loading, membrane movement, or access for drain maintenance.
- Coordinate the solar layout with the roof warranty and drainage design.
What it depends on
- Roof slope and drainage configuration
- Existing water-management problems
- Mounting, ballast, and equipment placement
- Roof structure and membrane condition
Risks and trade-offs
- Blocked or redirected water can cause leaks, ponding, structural stress, or membrane deterioration.
- Preserving drainage and access may reduce the usable array area.
- Ignoring an existing drainage defect can make later responsibility difficult to assign.
Information you may need
- Roof and drainage plan
- Inspection findings and ponding history
- Proposed mounting and ballast layout
- Maintenance and warranty requirements
Your next step
What to do next
Have a qualified roof professional review the drainage and proposed layout, and require corrections or written acceptance before approving the solar design.
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