01
Start with access and structural clearance
Do not begin sorting on an uncleared roof. The project team must first establish safe access and the condition of the supporting structure. Keep recovered slate from different roof zones separate and identify where each lot originated. Photographs and location labels help an assessor connect the material to its exposure history rather than treating the entire roof as one uniform batch.
02
Review heat exposure and prior condition
The National Slate Association cautions that fire exposure cannot be judged with a universal reuse rule. Previous deterioration and exposure to the hottest areas matter. Ask the assessor to explain the proposed acceptance criteria and reasons for rejecting particular lots. Do not use the fact that slate is noncombustible as evidence that its strength was unaffected by a specific fire.
03
Decide whether testing answers the question
For significant quantities, discuss representative laboratory testing with the consultant before paying for extensive cleaning or transport. Define which lots are sampled and what decision the results will support. A favorable result for one selected piece should not be treated as certification of every recovered slate. A field sound assessment can inform sorting but does not replace the complete evaluation.
04
Compare the delivered usable quantity
Price careful removal, sorting, testing, storage and breakage against the quantity likely to be accepted. Identify where approved pieces will be reused and whether their dimensions fit that layout. Keep rejected material separate so it cannot return accidentally to the roofing supply. Retain the acceptance report and final lot identification with the project record.