A small leak is found on a soldered joint on an internal cold water supply pipe, what action should be taken

• A. Drain the system down and resolder fitting
• B. Tighten the joint
• C. Insulate the pipe
• D. Isolate and replace the pipe

Answer: (A)

When a soldered joint leaks, the seal at the joint has failed, not just a loose nut. The fix is to restore the joint with proper soldering, which requires the area to be dry and clean so the solder can form a proper bond. The safest and most effective immediate action is to isolate the line, drain the system down to reduce or remove pressure, and re-solder the joint. This creates a watertight connection and prevents further water damage.

Tightening the joint won’t fix a leaked soldered joint because the solder has failed at the joint interface rather than simply being loose. Insulating the pipe won’t stop the leak, it only reduces heat loss and doesn’t address the water escaping. Replacing an entire section of pipe is more work than necessary for a small joint leak and is typically reserved for when the pipe or joint is damaged beyond repair.