Cert III Plumbing study materials
Cert III Plumbing study resources

Cert III Plumbing study plan

Cert III Plumbing · Give each week a clear focus.

8 weeks · About 7 hours per week

Week 1

Work health and safety, environmental sustainability and quality requirements & Sanitary plumbing, drainage and fixture installation

  • List the hazard categories on a residential plumbing site and match each to one control measure from the hierarchy of control

  • Explain the difference between a hazard, a risk and a control using three site examples you write yourself

  • Identify the PPE required for five common tasks (soldering, trench work, drain clearing, roof work, gas connection) and state why each item is needed

  • Outline the steps for isolating and tagging an energy source before working on a water or gas line

  • Describe how to segregate and dispose of three waste streams generated on a plumbing job, including a regulated waste

Your checkpoint

A one-page hazard-to-control matrix covering at least 12 hazards across domains 1 and 4, each with a named control and a responsible person

Week 2

Sanitary plumbing, drainage and fixture installation & Water supply, roofing, stormwater and rainwater services

  • Trace a sanitary drainage layout from a fixture to the connection point and label every fitting and gradient change

  • Calculate the fall required for a 12 m drain run at 1:60 and at 1:80, showing working

  • Size and select traps and venting for a bathroom group using the relevant plumbing code tables

  • Describe the correct installation sequence for a floor waste, water closet suite and basin including waterproofing interfaces

  • Compare the pressure and flow requirements of a cold water supply to a single dwelling against a multi-fixture installation

Your checkpoint

A hand-drawn drainage and water supply schematic for a three-fixture bathroom with labelled pipe sizes, gradients and venting, plus a written check against code requirements

Week 3

Water supply, roofing, stormwater and rainwater services & Excavation, trenching, pipe laying and site support

  • Calculate roof catchment area and expected rainwater yield for a 180 m2 roof at 800 mm annual rainfall

  • Size a stormwater downpipe and gutter run using manufacturer flow tables and record the assumptions

  • Describe the bedding, haunching and backfill requirements for a buried stormwater or sewer line at three depths

  • Explain shoring and battering options for a 1.8 m trench in two different soil types

  • List the locating and clearance checks required before excavating near existing services

  • State the inspection and testing steps for a completed below-ground drainage line before backfill

Your checkpoint

A stormwater and trenching work pack: catchment and downpipe sizing calculations, a trench cross-section sketch with shoring noted, and a pre-backfill inspection checklist

Week 4

Gas services, installation and safety & Welding, brazing, soldering and pipe joining techniques

  • Identify the components of a typical domestic gas installation from meter to appliance and state the function of each

  • Size a gas line for a given appliance load using pipe sizing tables and record the pressure drop assumption

  • Describe the purge, test and commissioning procedure for a new gas installation including test pressures and durations

  • Compare soldering, brazing and fusion joining and select the correct method for copper, PEX and PVC applications

  • Set up and perform a capillary solder joint on copper tube, then pressure test it and record the result

  • Explain combustion air, flueing and clearance requirements for an indoor gas appliance

Your checkpoint

A gas installation and joining record: a labelled gas line diagram with sizing calculations, a written test procedure, and a logged solder joint pressure test result

Week 5

Gas services, installation and safety & Heating, ventilation, air conditioning and refrigeration fundamentals

  • Describe the refrigerant cycle and identify the four main components and their function in a split system

  • Explain the safety controls for handling refrigerants, including PPE, ventilation and cylinder handling

  • Outline the ventilation requirements for a bathroom, kitchen and car park and state how each is achieved

  • Describe the condensate drainage requirements for an evaporative cooler and a split system indoor unit

  • List the checks required before and after connecting a gas appliance to an existing installation

  • Explain how to test for leaks on a refrigerant circuit and a gas line and state the difference in method

Your checkpoint

A side-by-side comparison sheet of gas and refrigerant safety and testing requirements, plus a labelled refrigerant cycle diagram with component functions

Week 6

Plumbing tools, equipment, materials and trade calculations & Plans, specifications, drawings and setting out

  • Read a set of residential plumbing drawings and extract the pipe sizes, gradients, levels and fixture schedule into a takeoff table

  • Calculate pipe lengths, fitting counts and material quantities for a bathroom and kitchen rough-in from the drawings

  • Set out fixture positions from a datum and check the results against the drawing dimensions

  • Select the correct tool for five named tasks and state one safety check for each

  • Convert between metric units used on drawings and site measurements and check a level against a reduced level

  • Describe how a specification differs from a drawing and identify three items that appear only in the specification

Your checkpoint

A complete material takeoff and setting-out sheet for one bathroom and kitchen, with quantities, unit conversions and a datum-based setting-out check

Week 7

Work health and safety, environmental sustainability and quality requirements & Plumbing tools, equipment, materials and trade calculations & Welding, brazing, soldering and pipe joining techniques

  • Write a safe work method statement for a task involving hot work and confined space entry

  • Demonstrate correct selection and inspection of brazing and soldering equipment before use

  • Describe fire watch and hot work permit requirements and the correct response to a flash fire

  • Explain how to store, transport and handle gas cylinders and refrigerant cylinders on site

  • Identify three environmental compliance obligations on a plumbing site and state how each is met

  • Complete a quality check on a finished pipe joint against a written acceptance criteria

Your checkpoint

A completed safe work method statement for a hot work task with a joint quality acceptance checklist attached

Week 8

Communication, teamwork, customer service and work organisation & Work health and safety, environmental sustainability and quality requirements

  • Write a customer handover script for a completed bathroom renovation covering operation, maintenance and warranties

  • Describe how to raise a variation with a client and document it in writing

  • Explain the purpose of a toolbox talk and prepare a five-minute talk on one safety topic

  • Plan a two-week work sequence for a small job including material ordering and inspection points

  • Resolve a written conflict scenario between two trades on site using a documented communication process

  • Review your weak areas from weeks 1 to 7 and list the three topics you will revise before the exam

Your checkpoint

A job pack containing a handover script, a written variation example, a toolbox talk outline and a two-week work sequence with inspection points

Milestones

Week 2: Score at least 80% on a self-made 20-question quiz covering domains 1 and 4, and correctly calculate drain fall for three different runs

Week 4: Produce a gas line sizing calculation and a passing pressure test record for a soldered copper joint, checked against code tables

Week 6: Complete a full material takeoff from drawings with quantities within 10% of a re-check, and pass a 30-question mixed quiz on domains 2 and 3

Week 8: Complete a timed 60-question mock exam across all 10 domains and score at least 75%, with no domain below 60%