01
Identify the claim's scope
Request the relevant documentation from the supplier or design team and ask whether it concerns the stone, a tested roof assembly, or a specific system configuration. Have the responsible professional confirm its relevance to the project and applicable requirements. Avoid treating a broad description of natural slate as a substitute for the documents needed for the proposed roof.
02
Check changes against the documentation
If the deck, underlayment, support system, or other component differs from the documented arrangement, ask how that difference is addressed. Keep the accepted evidence with the final specification. This is particularly important when comparing conventional slate with proprietary systems: the shared appearance of stone does not establish that their assembly documentation is interchangeable.