When there is a conflict between code requirements and installation instructions, which requirements prevail?

In the context of plumbing installations, when there's a conflict between code requirements and installation instructions, the more restrictive requirements take precedence. This principle is rooted in the idea that safety and compliance are paramount in plumbing practices.

Code requirements are established to ensure that plumbing systems are safe, efficient, and environmentally responsible. However, manufacturers may provide installation instructions that are specific to their products—these instructions can include certain allowances or methods that may not meet the codes in a strict sense.

By adhering to the more restrictive requirement, the plumbing professional ensures a higher standard of safety and compliance with industry best practices. This approach minimizes risks related to code violations or system failures, which could arise from a less stringent installation process.

This principle emphasizes the importance of not just following what is written but rather understanding that safety and functionality should be prioritized when interpreting conflicting guidelines. The more restrictive approach typically leads to better outcomes in terms of the long-term reliability and safety of plumbing installations.