What type of vent pipes should have protection against freezing?

Vent pipes of vent stacks should have protection against freezing because they play a crucial role in maintaining proper airflow and pressure within the plumbing system. If these vent pipes freeze, it can block airflow, leading to a variety of issues such as sewer gas buildup and drainage problems.

The primary function of vent pipes is to allow air to enter the plumbing system to prevent vacuum conditions that could impede the flow of wastewater. Unlike other types of pipes, which may primarily transport water or waste, the vent pipes must remain clear and functional at all times to ensure that the system operates effectively.

In colder climates, proper insulation and heat tracing are often recommended for these vent stacks to prevent freeze-ups that could cause costly repairs and system failures. Maintaining the integrity of the venting system is vital for the efficient operation of plumbing fixtures and appliances.