Where is CPVC water pipe NOT permitted for hot and cold supply lines?

The use of CPVC (Chlorinated Polyvinyl Chloride) water pipe is generally governed by plumbing codes that consider factors such as the temperature of the water being transported and the conditions under which the piping is installed. CPVC is approved for use in hot and cold water supply lines in many situations; however, it may not be permitted in multifamily residences due to specific local or national code requirements aimed at ensuring safety and preventing potential issues like expansion, contraction, or the risk of deterioration from higher temperatures under more demanding conditions that are typical in such settings.

Multifamily residences can experience more varied usage patterns and a greater strain on plumbing systems compared to single-family homes. This means the accountability for durability, leak prevention, and overall safety becomes heightened, prompting some jurisdictions to prohibit CPVC in these types of buildings despite its acceptance in single-family structures and other contexts. Therefore, understanding the regulations and the rationale behind them is critical for safe plumbing practices in multifamilyhousing.