NBOPE/IAPMO Master Plumber study plan

Draw the full DWV stack for a two-story house from memory, labeling every trap, vent, and cleanout, then verify each against code minimums

Calculate fixture units for a 3-bath dwelling using a fixture-unit table and size the building drain and building sewer

Explain the difference between a common vent, a wet vent, and a circuit vent by writing a 150-word comparison with a sketch for each

List the vertical and horizontal trap-arm distance limits and the vent-termination clearances, and recite them without notes

Size a cold and hot water distribution system for a 3-bath home using the demand-weight method, showing pipe sizes at each branch and main

Compute developed length and pressure loss for the longest run, and confirm residual pressure at the topmost fixture meets the minimum

Identify the allowable materials and joining methods for water distribution and drainage, and note where each is restricted

Diagnose five given venting errors (e.g., crown-vented fixture drain, flat vent, oversized vent) and prescribe the correction

Build a table of the five backflow-prevention assemblies/devices, their application, and the test procedure for each

Identify every cross-connection hazard in a supplied commercial plan set and specify the required protection for each

Design a reduced-pressure-zone installation with correct clearances, drainage, and freeze protection details

Explain thermal expansion control and its interaction with backflow devices on a closed system

Size a water heater and size the relief valve, discharge pipe, and expansion tank for a given occupancy load

Calculate combustion air for a mechanical room by both the indoor and outdoor air methods and compare results

Size a gas piping system by the longest-length method and by the branch-length method, and explain when each is used

Identify the venting category of a given appliance and specify the vent connector, termination, and clearances

Explain scald-prevention requirements and specify tempering or mixing-valve protection at fixtures

Size roof drains, leaders, and storm building drains for a given roof area and rainfall rate, and check the storm drain for surcharge and overflow provisions

Design a secondary/overflow drainage path and specify where it is required

List the special waste streams (grease, acid, chemical, medical) and the treatment or dilution each requires

Describe the medical-gas and health-care plumbing requirements: zone valves, vacuum systems, and fixture clearances

Trace an indirect waste receptor installation and verify the air gap and air break dimensions

Outline the permit-to-final-inspection sequence for a commercial project, naming the inspections and who calls for each

Read a supplied plan set and produce a takeoff of fixtures, pipe lengths, and fittings for one floor

Build a bid from the takeoff: labor hours, material markup, overhead, and profit, with a stated contingency

Identify the licensing, insurance, and contract provisions a master plumber must verify before signing

Answer 40 practice questions across these domains and log every miss with its code citation

Complete a 100-question timed practice exam covering all domains and score it by domain

Re-study every missed item for the three weakest domains and write the governing rule for each

Recompute two sizing problems (water supply and gas) under time pressure without reference tables

Recite the key numeric limits (trap-arm distances, vent clearances, relief-valve settings, fixture-unit values) from memory in a self-quiz

Take two full-length timed practice exams and record the score trend

Review the error log and close every remaining gap in the weakest two domains

Rehearse the code-administration and business-management items, which are commonly understudied

Write a one-page exam-day plan covering pacing, flagging strategy, and reference-tab organization