01
Identify what each lot actually contains
Assign a lot number and record the source if known, dimensions, thickness range, color, approximate quantity and condition. Link the lot to photographs and the buildings it may match. Keep uncertain identifications marked as uncertain. A crate labeled old slate offers little help when a contractor needs to know whether there are enough compatible pieces for a repair.
02
Separate availability from suitability
Record whether pieces have been assessed, require sorting or are reserved for a particular project. A count of stored pieces is not a count of roof-ready replacements. Ask the slater to confirm suitability for the intended location before issuing material. Keep rejected and nonroofing material separate so an untrained person cannot accidentally release it as accepted stock.
03
Log withdrawals and additions
Use a simple ledger with date, quantity, destination roof area and contractor. Record new material returned after a project as its own lot if its identity differs. Keep the ledger available to the building manager and the maintenance contractor. Periodically compare the recorded balance with the actual stock so emergency planning does not rely on an outdated number.
04
Review stock during maintenance planning
When a roof assessment predicts repeated repairs, ask whether the reserve is adequate and whether additional matching material should be sourced. Consider storage access and handling arrangements before acquiring another large lot. Include the inventory and its location in ownership or facilities handovers so useful material is not discarded during a storeroom cleanup.