Path-Q Solar
When should a small business request a structural assessment before pursuing rooftop solar?
Answer
Request an early structural assessment when the commercial roof is older, heavily loaded, damaged, unusual, long-span, near its design limits, or subject to planned replacement or expansion. It is also prudent when the proposed system is large, the roof has uncertain records, or delaying the assessment could lead to redesign or construction changes.
Key points
- The assessment should consider existing loads, proposed solar and ballast or attachment loads, wind and environmental effects, roof condition, and load paths.
- Coordinate structural findings with the roofing contractor and solar designer.
- Existing drawings, prior assessments, and roof warranty requirements can improve the review.
What it depends on
- Roof structure and condition
- Proposed system size and attachment method
- Existing rooftop equipment and loads
- Building records and local project requirements
Risks and trade-offs
- Early assessment adds cost and time but can prevent redesign, construction delay, roof damage, or an unsuitable project.
- A favorable desktop review may not replace field verification where conditions are uncertain.
Information you may need
- Structural and roof drawings
- Roof age, repairs, and warranties
- Existing rooftop equipment and planned additions
- Preliminary solar layout and loading information
Your next step
What to do next
Give the roof and building records to a qualified structural professional and solar designer before finalizing system size or signing a construction contract.
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