Path-Q Solar

How should dormers and skylights affect the solar layout on my roof?

Answer

Treat dormers and skylights as exclusions or constraints when laying out panels, while preserving required access, drainage, flashing, and maintenance clearances. They reduce usable area and can cast shade, but a careful design may place panels around them or use another roof plane.

Key points

  • Measure the actual obstruction footprint and any required service clearance.
  • Consider shadows from dormer walls, skylight wells, and nearby roof structures.
  • Avoid placing panels where they would obstruct skylight operation, repair, or emergency access.
  • The final layout should account for panel dimensions, setbacks, pathways, and roof attachment locations.

What it depends on

  • Size and position of dormers and skylights
  • Required maintenance and safety clearances
  • Shading at different times of year
  • Roof geometry and panel dimensions
  • Whether the obstructions may be relocated or modified

Risks and trade-offs

  • Packing panels tightly around obstructions can complicate installation and future roof work.
  • Leaving generous clearances may reduce capacity but improve access and reduce risk.
  • Ignoring obstruction shade can overstate production.

Information you may need

  • Scaled roof measurements and obstruction locations
  • Skylight and dormer maintenance requirements
  • Shading analysis
  • Proposed panel layout and access paths
  • Roof condition around the obstructions

Your next step

What to do next

Provide the installer with accurate obstruction measurements and ask for a scaled layout showing clearances, shading assumptions, and the resulting capacity.

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