01
Measure the pattern of failure
Scattered broken pieces, localized storm damage or failed flashings may support repair. Widespread breakage, severe delamination, systemic fastening problems or extensive deck failure may point toward larger work. The percentage and distribution of serviceable slate should be documented.
02
Consider salvage and reuse
Sound existing slate may be reusable on the same project, subject to careful removal, sorting and project requirements. Salvage can preserve historic character and provide matching material for less visible elevations or future repairs. Handling and storage need to be planned before tear-off begins.
03
Compare complete scopes
A replacement proposal should identify slate, underlayment, fasteners, flashings, ventilation, deck repairs and disposal. A repair proposal should identify expected service goals and known limitations. Compare like-for-like scopes rather than deciding from the bottom-line number alone.