The structure, from the inside

Rafters don't show up on imagery. The technician goes into the attic and records size, spacing and span, so the engineer designs attachments onto framing that is actually there.

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Residential attic framing with rafters, ducting and junction boxes — Field photo · Attic framing and obstructions

Rafter size

Measured, then photographed

Nominal is not actual. A "2x6" in an older house can be a true two by six, or something that was cut down decades ago. The tape settles it.

Every measurement is photographed where it was taken, so the number and the proof arrive together.

Tape measure reading the depth of an attic rafter — **Depth** measured on the member

Spacing and span

Where the attachments can land

Spacing decides where the rails can attach. Span decides whether the roof can take the load without reinforcement. Both get recorded across the planes that will carry the array.

Decking, sheathing and anything in the way of a lag, ducting, wiring, bracing, is noted before anyone is on the roof with a drill.