Path-Q Solar
What structural information is needed before installing solar on a roof with engineered trusses?
Answer
The project needs enough information to verify that the trusses, connections, roof sheathing, and supporting walls can carry the solar system's dead, wind, snow, and other applicable loads. This usually requires truss plans or field measurements, existing-condition information, and a design-specific structural review.
Key points
- Truss capacity depends on span, spacing, member sizes, connections, bracing, supports, and existing alterations.
- Loads must be evaluated where attachments transfer forces into the trusses and supporting structure.
- Solar attachments should not be assumed acceptable based only on roof surface appearance.
What it depends on
- Original truss drawings, as-built changes, and field condition
- Solar panel, racking, attachment, ballast, wind, and snow loads
- Load paths, roof condition, and applicable structural design requirements
Risks and trade-offs
- Unverified attachments can damage trusses, sheathing, roofing, or interior finishes.
- Reinforcement or a revised layout may increase cost or reduce the system size.
- Drilling or cutting truss members without engineering approval can compromise the structure.
Information you may need
- Truss design drawings, framing plans, permits, and alteration history
- Roof measurements and photographs of accessible framing
- Design-specific load calculations and attachment details
Your next step
What to do next
Provide the structural records and proposed solar design to a qualified structural professional for an eligibility review before installation.
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