Illustrative inspection checklist

Bolt torque

Checked with a calibrated wrench, and recorded per connection type

Clamp position

Within the declared clamp zone, measured from the module corner

Rail span

As drawn, because a longer span changes the load path

Fixing depth

Into the structure, not only into the roof covering

Earthing continuity

Bonding between rails and modules, measured

Dissimilar metal separation

Washers present where the drawing calls for them

Cable management

Clear of the roof and of sharp edges

Marking

Batch identifier legible on the rail or its packaging

An illustrative checklist for a fictional range. A real programme defines the tolerance, the sampling method, the inspection window and the remedy if a batch fails.

The four things a programme needs in writing.

The tolerance, the sampling method, the window in which inspection happens, and what happens if the batch fails. Without all four, a failed delivery becomes an argument rather than a process.

Why torque is recorded rather than checked.

Because it cannot be verified afterwards without loosening the joint. A record made at the time is the only evidence that it was done, and it is what an insurer will ask for.