Ask for drawings, risk assessments, insurances, conservation statements, and example site diaries. Accreditation, where relevant, adds context but should not outweigh demonstrated compatibility testing. Include photos of test panels, material datasheets, and disposal plans. A coherent package signals mature practice and reduces surprises once scaffolds rise and weather shifts.
Use scenario questions about salts, trapped moisture, failing finishes, and hidden services. Listen for caution, sequencing, and documentation, not bravado. The right mindset integrates trades, schedules trials around seasons, and invites independent oversight. Good answers reveal boundaries, contingency planning, and respect for the building’s cultural, emotional, and spiritual value.
Before committing, commission sample panels or small interventions on sacrificial zones. Track moisture, salts, adhesion, and visual integration over weeks. Invite stakeholders to compare outcomes under identical light. This shared evidence builds trust, clarifies expectations, and gives candidates a fair, transparent way to demonstrate competence without risking irreplaceable fabric.
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