Common solar structural corrections

Structural corrections stall solar permits just as often as electrical ones, and they can be harder to fix in the field. Reviewers need to see that the roof can carry the array and resist wind and snow, with attachments specified precisely. Here are the top structural rejections and how to clear each.

1. Missing or vague attachment details

The most common structural correction is an attachment that is not fully specified. Reviewers want the fastener type, embedment, and spacing — lag screws, standoffs, or hardware into the framing, not just the sheathing.

Fix: call out the exact attachment product, the fastener and its penetration into the rafter, and the spacing, matching the racking manufacturer's listing.

2. Rafter or truss capacity not verified

An array adds load to existing framing. If the plan does not show the rafter size, span, and spacing and demonstrate they can carry the added load, it gets corrected.

Fix: document the existing framing (for example, 2x rafters at a given spacing and span) and show it is adequate, or provide an engineer's analysis where the framing is marginal.

3. Missing or incorrect load calculations

Reviewers check that the design accounts for the site's dead, wind, and snow loads per the adopted building code. A set with no load basis, or the wrong wind speed or snow load for the location, is corrected.

Fix: use the correct site-specific design values and show the attachment spacing that satisfies the resulting loads.

4. Attachment spacing exceeds the racking limit

Even with the right fastener, spacing the attachments too far apart exceeds the racking manufacturer's span tables and the framing's capacity under uplift.

Fix: tighten the attachment spacing to the manufacturer's certified layout for the site's wind load.

5. No engineer's stamp where required

Older roofs, unusual framing, tile or heavy roofing, and high wind or snow zones often trigger an AHJ requirement for a licensed engineer's structural analysis and stamp. Filing without it when required is an automatic correction.

Fix: confirm with your AHJ whether a stamp is required, and engage a licensed PE early if so.

Why these repeat

Structural corrections come down to specificity: a reviewer cannot approve an attachment or framing assumption they cannot see documented. A set that names the fastener and spacing, verifies the rafters, uses the correct site loads, and includes a PE stamp where required clears structural plan check far more often. For the broader list, see why solar permits get rejected and what is in a permit set.

A design tool cannot guarantee approval, and a licensed engineer must review and stamp structural work where the AHJ requires it. But building an accurate, complete set — starting with our DIY workflow — is how you avoid the structural correction cycle.

Educational reference, reviewed 2026-07. A design aid, not a substitute for a licensed electrician or PE. Confirm the enforced NEC edition and local amendments with your AHJ.