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Cost vs. performance is often a primary debate when an owner or developer is deciding on material selection for their building. Decades ago, the debate on drainage pipe material selection was oftentimes not a debate at all. Cast Iron was the primary drainage material utilized for most all construction.
In recent times, PVC has become a very viable option for use in both residential and commercial construction. Cost and ease of use is often the justification for this selection. However, it’s important to discuss the pros and cons of each drainage piping material with the building owner before making a selection.
Below are a few discussion points that may be relevant when helping make a decision:
Cast Iron sanitary and vent stacks (black) for future connection by office tenant[/caption]
Durability:
Cast iron often lasts significantly longer than PVC piping when utilized in drainage systems. Cast iron piping can last several decades, if not for a century. One downside of cast iron is that it is susceptible to rusting if not maintained properly. The lifespan of PVC is harder to predict, as it’s use in drainage systems doesn’t have as long a history as does PVC. PVC has a lower temperature limit and higher expansion rate. It is important to consider the system that PVC will be utilized in, as it is susceptible to damage at high temperatures and highly acidic wastes. Bracing and hanger support also has to be taken into consideration for PVC, as it can expand with higher levels of temperature swing. PVC is not fire proof. It’s essential to ensure it is properly fire sealed at penetrations, as they will need to be handled differently than a cast iron penetration. Also, the use of PVC in return air plenums is not permitted. [caption id="attachment_33347" align="alignnone" width="300"]
Cast Iron sanitary and vent stacks (black) for future connection by office tenant[/caption]