01
Demand product identity
Ask for producer, quarry, product name, dimensions, thickness range, weathering characteristics and applicable test reports. Avoid descriptions that can be switched among unrelated sources.
02
Evaluate logistics and continuity
Confirm inventory, lead time, packaging, freight responsibility, breakage procedures and the ability to supply matching pieces later. Large projects may need phased production and retained samples.
03
Test technical support
A knowledgeable supplier should answer questions about sizes, quantities, sorting, fasteners and system limitations without replacing the role of the designer or installer.