Path-Q Solar
What roof and structural information should I gather to determine whether my solar project needs a structural engineer?
Answer
Gather roof age and condition, construction and framing information, prior alterations or damage, available plans, and the proposed panel and attachment layout; then ask the installer whether the project triggers an engineer review under applicable requirements.
Key points
- Collect roof material, approximate age, repair history, leaks, visible sagging, and areas with deterioration.
- Provide attic or structural information such as framing type, spacing if known, trusses or rafters, and previous additions or modifications.
- Gather building plans, prior inspection reports, renovation records, and any known structural concerns.
- Ask for the proposed system weight, attachment locations, wind and weather design assumptions, and whether an engineer’s letter or stamped design is required.
- An installer’s initial screening does not replace an independent structural assessment when the condition or load path is uncertain.
What it depends on
- Roof condition, framing, and existing structural loads
- System size, panel arrangement, attachment method, and equipment location
- Local permitting, building-code, and engineering requirements
- Whether the roof will be replaced or repaired before installation
Risks and trade-offs
- Installing on a roof near the end of its useful life can require costly removal and reinstallation.
- Hidden damage or inadequate framing can delay the project and increase cost.
- Avoiding an appropriate engineering review can create safety, permit, insurance, or resale problems.
Information you may need
- Roof inspection or repair records
- Construction drawings or attic observations
- The installer’s preliminary layout and structural-loading information
- The applicable authority’s engineering and permit requirements
Your next step
What to do next
Give the installer your roof and structural records and request a written determination of whether engineering review is needed; verify that determination with the permitting authority or a qualified structural engineer when required or uncertain.
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Some details may depend on your location, installer, utility, incentives, regulations, or specific property.
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