OH Journeyman Plumber study plan

Map the DWV domain's 20 percent weight into a checklist of fixture-drain, trap, vent, and building-drain subtopics you will drill each week

Trace a full DWV path on paper from a water closet flange through the closet bend, branch, stack, and building drain to the sewer, naming each fitting and its purpose

Identify the vent types (individual, common, wet, circuit, stack, relief) and state in writing the condition each one protects against

List the trap-seal requirements you must memorize, including seal depth, trap-arm distance limits, and prohibited trap configurations

Complete 40 practice items on traps and venting and log every miss with the rule you violated

Calculate drain and vent pipe sizing for a worked example using fixture units and developed length, showing every step

Explain the difference between a wet vent and a dry vent and identify three field situations where each is used

Describe the correct installation sequence for a water closet, lavatory, and floor drain, including rough-in dimensions and flange height

Diagnose five written DWV failure scenarios (gurgling trap, sewer odor, slow drain, bubbling fixture, frozen vent) and prescribe the code-compliant fix for each

Recite the slope requirements for drain pipe by size and the cleanout spacing rules from memory in writing

Catalog the common plumbing fixtures and their required flow rates, fixture-unit values, and minimum trap sizes in a comparison table

Describe the water supply distribution layout from meter through main, riser, and branch, including the function of each valve and device

Explain backflow prevention devices and identify which cross-connection situations require an air gap versus a vacuum breaker versus a reduced-pressure assembly

Compute the minimum required number of fixtures for a small commercial occupancy given occupant load and fixture ratios

Complete 40 practice items mixing fixtures and water supply and review every missed item against the code text

Size a water supply system using demand loading and pressure-loss tables, showing the calculation for a two-bath dwelling

Compare copper, PEX, CPVC, and galvanized pipe on pressure rating, joining method, freeze behavior, and approved applications, and write a short selection rationale for each

Identify the fittings and joining methods for each pipe material and state the code restriction on mixing materials or using dielectric unions

Explain thermal expansion control, water hammer arrestors, and pressure-reducing valve placement in a distribution system

Complete 30 practice items on pipe materials and fittings and correct each miss in writing

Outline the permit, inspection, and testing sequence for a residential plumbing rough-in and final, naming the inspection stage at which each test occurs

State the hydrostatic and air test pressure and duration requirements for DWV and water supply systems

List the code requirements that most often trigger failed inspections, including support spacing, protection of pipe, and prohibited fittings

Describe the licensing and code-adoption framework that governs journeyman plumbers in Ohio, including who adopts the code and what the journeyman is responsible for on site

Complete 40 practice items on code and regulations and log the code section behind each missed item

Demonstrate the safe setup and use of the core tools (press tool, tubing cutter, soil pipe cutter, auger, torch) and state the hazard each tool presents

Explain confined-space, trenching, and soldering-fire safety practices and the personal protective equipment required for each task

Compute pipe offsets, travel, and fitting takeoffs for 45-degree and 22.5-degree offsets and verify your answers with a second method

Convert between decimal inches, fractions, and metric units and calculate pipe volume, fixture-unit totals, and developed length from a sketch

Complete 25 mixed safety and math practice items and rework every missed calculation until correct

Design a complete plumbing layout for a two-bath single-family dwelling, showing fixture placement, DWV routing, vent connections, and water supply branches

Justify each sizing decision in the layout by citing the fixture-unit and demand-load basis you used

Identify the installation details that differ between a slab-on-grade, crawl space, and basement rough-in and adjust your design accordingly

Review your layout against a written self-audit checklist covering trap seals, venting, cleanouts, support, and access

Present the design in a short written narrative as if explaining it to an inspecting authority

Take two full-length timed practice exams under test conditions and record the score by domain

Rank your three weakest subtopics from the practice exams and drill 20 targeted items on each

Rewrite your DWV, water supply, and code cheat sheets from memory and compare against your originals to find gaps

Review every remaining flagged item from weeks 1 through 7 and resolve each one to a confident answer

Build a final one-page pre-exam review sheet limited to the facts you most often missed