In what scenario is it essential to inform the client about membrane conditions?

Informing the client about membrane conditions is most critical when there are signs of potential water accumulation. This scenario is vital because water accumulation can significantly compromise the integrity of a radon mitigation system. Membranes are essential components of these systems, designed to prevent the entry of radon from the soil, but if moisture accumulates, it can lead to potential leaks or structural issues in the system. Addressing these concerns promptly is crucial to maintain the system's effectiveness and to ensure the safety of the indoor environment.

In contrast, notifying the client during system installation or at the end of the project may be too late to address potential issues that could arise from accumulated water. Regular check-ins are valuable for ongoing maintenance and reassurance but might not allow for the immediate response that is required when actual signs of water accumulation are observed. Therefore, the focus should be on real-time conditions that could impact the system’s performance and safety, making it essential to inform clients immediately when potential water issues arise.