The manufacturer's instructions for its own panel: fastener type and spacing, clip layout, minimum slope, underlayment requirements, and detail drawings for every junction. It is written for installers, and it is also the document your material warranty is measured against.
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Because manufacturer coverage is conditional on the panel being installed the way the manufacturer specified. Depart from the manual and the finish warranty can be reduced or voided, regardless of how well the roof performs.
That is worth knowing before a company suggests a shortcut, whether that is wider clip spacing, a different underlayment or a substitute fastener. how metal roofing is installed covers how the system is meant to go together.
You are not installing the roof, so most of it is not for you. Four parts are.
how installed prices are built up covers what a properly specified installation adds to a quote.
From the manufacturer, usually free on their website. Ask the company which panel it is quoting and look it up.
For the warranty to hold, generally yes. Experienced crews have their own methods, but departures should be deliberate and discussed.
The drawings are usually part of it, covering eave, valley, wall and penetration junctions for that specific profile.
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