True or False: All joints in radon mitigation systems using plastic pipes must be permanently sealed with adhesives.

• A. True
• B. False
• C. Only for pressure systems
• D. Only if specified by manufacturers

Answer: (A)

The statement that all joints in radon mitigation systems using plastic pipes must be permanently sealed with adhesives is true. Permanent sealing of joints in radon mitigation systems is essential for ensuring that no radon gas can escape from the system, which would render the mitigation effort ineffective. Proper sealing prevents potential leaks that could allow radon, a radioactive gas found in soil and rock, to enter buildings again.

Additionally, using adhesives at joints helps to maintain the integrity and performance of the system over time, as changes in temperature and pressure can affect the tightness of the connections. This is particularly important in radon mitigation systems where maintaining a negative pressure in the sub-slab area is crucial for effective gas migration control.

While there could be exceptions based on specific installation scenarios or regulatory guidelines, the general principle is that joints should be permanently sealed to provide a robust barrier against radon infiltration, making the claim accurate.