How many patch tests must be conducted prior to encapsulating?

The requirement to conduct one patch test per room before encapsulating is based on ensuring that lead-based paint hazards are properly assessed in each specific area where encapsulation will occur. This process helps to determine the condition of the paint surfaces in different rooms, which might have varied levels of lead content or different types of paint. By performing a patch test in each room, a lead inspector can gather adequate data to evaluate the efficacy of the encapsulation effort, ensuring that all potential hazards are identified and managed properly.

This approach prioritizes safety and thoroughness, giving a clear understanding of lead exposure risks specific to each room. In situations where different rooms might have differences in paint condition or potential lead exposure, this testing methodology is crucial to ensure that all areas are appropriately addressed before proceeding with encapsulation, which is a form of remediation aimed at preventing lead exposure.