Diagnose and Repair Common Plumbing Leaks

A. Finished-Project Specification

Quantity: one reported leak, traced to one confirmed source, corrected using one controlled repair type — compression, threaded, or slip-joint trap — and verified by one repeated condition test and one delayed dry reinspection, all recorded on one completed Leak Diagnosis and Repair Record.

B. Leak Diagnosis and Repair Schedule

Item	Target Condition	Verification Method
Reported symptom	Location, timing, water use, and weather condition defined in writing before testing	Written record on the repair record
Stop-work sweep	No electrical exposure, sewage, hot water, structural damage, mold, or ceiling saturation left unaddressed	Visual inspection before testing begins
Single-condition testing	Each possibility (supply, fixture, appliance, drain, overflow, sealant, condensation, exterior water) tested one at a time	Dry tissue, inspection mirror, moisture meter, or dye at each condition
Confirmed source	Highest confirmed wet point identified and documented, not assumed from the visible drip	Direct observation at the traced point
Repair	Compression, threaded, or slip-joint correction performed only on the confirmed source, matching the confirmed repair type	Visual inspection of the completed repair
Repeated condition test	Exact original condition reproduced without leakage at the repaired point	Direct observation during and immediately after the repeated condition
Delayed dry reinspection	Repaired area remains dry after the specified observation period	Dry-tissue or moisture-meter check after the observation period

C. Material Takeoff

• Compression-repair materials: a replacement ferrule and compression nut matching the fitting manufacturer's specification and the confirmed tube size.
• Threaded-repair materials: thread sealant rated for the service and pipe material, sized to the confirmed connection.
• Slip-joint repair materials: a replacement slip-joint washer matching the trap or tailpiece diameter.
• Diagnostic materials: leak dye tablets, dry tissue, and floor protection sufficient to cover the affected area during testing.
• Documentation: one Leak Diagnosis and Repair Record per project, plus photographs of the wet pattern, the confirmed source, and the completed repair.

D. Acceptance Standards

Check	Standard
Symptom definition	Location, timing, water use, and weather condition recorded before any diagnostic test begins
Source confirmation	Leak source identified by direct testing at the traced point, not by assumption from the visible drip
Repair match	Repair method matches the confirmed leak type exactly — compression, threaded, or slip-joint — with no substitution of a different correction
Repeated test	The exact condition that produced the original leak is reproduced, and no leakage is observed at the repaired point
Delayed reinspection	The repaired area and adjacent lower building areas remain dry after the specified observation period
Documentation	Leak Diagnosis and Repair Record complete with symptom, confirmed source, repair method, and both test results
Escalation	Any leak outside the three controlled repair types referred to the required qualified professional and documented as escalated

E. Symptom Definition and Initial Inspection

1. Define the reported symptom, location, timing, water use, weather condition, and prior repair history. Record the exact wording of the reported symptom before any testing begins.
2. Inspect for electrical exposure, sewage, hot water, structural damage, mold, ceiling saturation, and other stop-work conditions. Treat any of these as an immediate stop-work condition until corrected or escalated.
3. Protect the area and isolate energy or water where immediate damage is occurring. Use the Chapter 1 isolation and protection procedure for the affected system.

F. Staged Single-Condition Testing

1. Dry all accessible surfaces before testing. Confirm a dry starting condition at every point that will be tested.
2. Observe the water meter or other approved indicator with all fixtures off where appropriate. Record whether the indicator shows continuous flow with no fixture in use.
3. Separate the system into supply, fixture, appliance, drain, overflow, sealant, condensation, and exterior-water possibilities. List each possibility present in the affected area before testing any of them.
4. Test cold supply, hot supply, fixture operation, basin fill, overflow, full-basin drain, trap, appliance cycle, and nearby penetrations one condition at a time. Dry the area between each tested condition.
5. Use dry tissue, inspection mirror, moisture meter, dye, or other approved confirmation tool. Record the result of each test as confirmed wet, confirmed dry, or inconclusive.
6. Trace water to the highest confirmed wet point rather than assuming the visible drip is the source. Continue tracing upward and outward until no further wet point is confirmed.
7. Document the confirmed leak source and repair boundary. Record the exact joint, fitting, or connection identified as the source before selecting a repair method.

G. Controlled Repair by Confirmed Type

1. For a compression leak, isolate and depressurize, inspect alignment and ferrule condition, and perform only the approved adjustment or replacement. Use backup wrenches, hold the fitting body stationary, and do not overtighten the compression nut beyond the manufacturer's controlled procedure.
2. For a threaded leak, isolate and disassemble, inspect thread condition, clean, apply compatible sealant, and reassemble with backup support. Apply thread sealant only to the confirmed threaded connection, not to any other joint in the affected run.
3. For a slip-joint trap leak, drain the assembly, correct alignment, replace damaged washers, and retighten within the permitted range. Confirm the trap seal depth and alignment match the Chapter 9 configuration before retightening.
4. For a fixture or appliance leak outside these controlled repair types, follow the exact manufacturer procedure or refer the work. Document the referral and the reason the leak falls outside this chapter's controlled repair types.
5. Do not coat an active leak externally with caulk, tape, epoxy, solder, or sealant unless the approved repair system specifically requires it. Confirm the repair addresses the confirmed source directly rather than concealing the symptom.

H. Verification and Documentation

1. Restore water or operation gradually. Observe the repaired connection continuously while pressure or flow is restored.
2. Repeat the exact condition that produced the original leak. Reproduce the same fixture use, water temperature, or operating cycle described in the original symptom.
3. Inspect immediately and after the specified observation period. Record both the immediate result and the delayed result separately.
4. Check adjacent and lower building areas for retained moisture or secondary damage. Confirm no secondary leak path was created by the original leak or by the repair.
5. Dry the area and record repair materials, test conditions, observations, and results. Complete every field on the Leak Diagnosis and Repair Record.
6. Escalate concealed, recurring, structural, sewage, gas, or water-heater leaks to the required professional. Document the escalation and the reason before closing out the project.
7. Complete the leak-repair closeout and owner monitoring instructions. Provide the owner with the confirmed source, repair performed, and what to monitor going forward.