Trade Exam · Module 5
Leak Detection and Repair
Spot visible leaks first, use the water meter to find hidden leaks, thermal imaging and acoustic detection for slab leaks, always pressure test after repair.
Key Takeaways
Why This Matters on the Exam
Leaks are the bread and butter of service plumbing. A small drip wastes thousands of gallons a year and turns into tens of thousands of dollars in water damage. The C-36 exam tests your ability to find leaks, diagnose them, and understand repair options. You need to know the difference between visible leaks (easy) and hidden leaks (detective work). Master this and you'll be fielding calls every day.
What You Must Know
Leaks come in two flavors: visible (you see the water) and hidden (water escapes inside walls, under slabs, or in underground lines). Finding and fixing leaks quickly saves customers thousands and prevents structural damage, mold, and code violations. Know your diagnostic tools: observation, the water meter, thermal imaging, acoustic detection. Know your repair materials: copper, PEX, galvanized. Know how to test the repair: pressure testing.
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