Path-Q Solar
When is a professional roof assessment more useful than relying on satellite imagery for solar planning?
Answer
A professional roof assessment is more useful when roof condition, structure, penetrations, drainage, access, shading detail, or future roof work could materially affect the design. Satellite imagery can support early screening but cannot reliably reveal those conditions.
Key points
- Satellite images may miss roof age, leaks, membrane condition, structural limitations, obstructions, and attachment details.
- An assessment is especially important for older, complex, steep, damaged, or heavily modified roofs.
- Roof replacement timing can be more important than small differences in modeled solar output.
What it depends on
- Roof age, material, slope, and condition
- Array size, weight, attachment method, and wind or snow exposure
- Visible and concealed obstructions
- Planned renovations, penetrations, and maintenance access
Risks and trade-offs
- Relying only on imagery can lead to redesign, removal, leaks, or structural problems after contracting.
- A professional assessment adds time and cost but may prevent larger downstream costs.
- A roof assessment does not replace a complete solar electrical and production design.
Information you may need
- Roof installation and repair history
- Interior evidence of leaks or structural movement
- Roof plans, photos, and utility or HVAC layouts
- Installer's proposed attachment and access plan
Your next step
What to do next
Obtain a roof assessment before finalizing the solar design when roof condition or structural suitability is uncertain, then give the findings to bidders.
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