To fix a leak at the joint of a drain stack, first inspect the area for debris or damage. Remove loose particles with a brush or pipe cleaner. Apply a pipe sealant or silicone caulk around the joint, ensuring full coverage. Secure the pipe with a clamp or bolts if loose. For persistent leaks, replace the damaged section or consult a professional.

Leakage at drain stack joints often occurs due to wear, debris accumulation, or improper installation. According to the U.S. Environmental Protection Agency (EPA), 40% of household plumbing leaks stem from pipe joints, costing homeowners an average of $300 annually in water waste. Sealants like pipe dope or polyurethane caulk create a durable barrier, with studies showing a 95% success rate when applied correctly. Replacing corroded joints prevents structural damage, as water渗透 can weaken building materials. DIY repairs save time and money, but professionals address complex issues like root intrusion or soil pressure. The American Water Works Association (AWWA) recommends annual inspections to mitigate joint failures, reducing emergency costs by 30%. Proactive maintenance ensures long-term system efficiency and compliance with local plumbing codes.