Path-Q Solar
When should I request a structural engineer rather than rely on an installer's roof assessment?
Answer
Request an independent structural engineer when the roof’s capacity or condition is materially uncertain, the building is unusual or heavily modified, or the installer cannot clearly support the structural assumptions. An installer’s assessment may be adequate for routine conditions but is not a substitute for independent engineering when the risk is significant.
Key points
- Consider engineering for older roofs, unusual framing, large or complex arrays, prior damage, additions, or signs of sagging or movement.
- Also consider it when the roof will be repaired, overlaid, reinforced, or exposed to unusual environmental loads.
- Ask whether the installer’s review is a visual screening, an engineering calculation, or a stamped design.
What it depends on
- Roof age, framing, materials, and visible condition
- Array size, mounting method, and building characteristics
- The installer’s qualifications, scope, and documentation
Risks and trade-offs
- Engineering adds cost and may delay the project but can identify unsafe or unsuitable conditions.
- Relying only on a non-engineering assessment can create safety, damage, warranty, or redesign risks.
- An engineer may recommend roof work that changes the project budget.
Information you may need
- Roof plans, construction records, inspection reports, and repair history
- The proposed array and mounting design
- A written description of what the installer has and has not verified
Your next step
What to do next
Ask the installer to state in writing whether structural engineering is included; if significant uncertainty remains, obtain an independent engineer’s review before signing.
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