ICC G28 National Standard Journeyman Plumber with Gas Exam - Online Practice Questions

Prepare for the ICC G28 National Standard Journeyman Plumber with Gas exam with online practice questions designed to strengthen plumbing and fuel-gas code knowledge, improve plan-reading skills, and build faster reference-navigation habits. This preparation product includes 3 months of access, giving you time to study the major plumbing and gas subjects covered on the examination while working with the 2018 International Plumbing Code and the 2018 International Fuel Gas Code.

The G28 National Standard Journeyman Plumber with Gas examination combines traditional Journeyman Plumber subjects with fuel-gas requirements. Candidates should be prepared for questions involving general plumbing regulations, code terminology, plan reading, testing, approved materials, plumbing fixtures, potable water systems, sanitary drainage, venting, traps, interceptors, separators, storm drainage, gas piping, combustion air, fuel-burning appliances, vents, and connectors.

This combination requires candidates to work confidently with two different code books. The 2018 International Plumbing Code addresses the plumbing portion of the examination, while the 2018 International Fuel Gas Code supports study of gas piping, combustion-air provisions, appliance requirements, and venting systems.

Effective preparation for an open-book Journeyman Plumber with Gas exam involves more than reading the codes. Candidates should understand how each reference is organized and develop the ability to determine quickly which book, chapter, section, or table applies to a particular question.

Online practice questions help turn the IPC and IFGC into working study references. Each question can be used to identify the subject, select the appropriate code, locate the governing provision, and apply it to the installation or scenario presented.

Exam Details

The ICC G28 National Standard Journeyman Plumber with Gas examination contains 70 multiple-choice questions and has a 3-hour time limit.

The official examination outline divides the G28 exam into eight major content areas:

• Administration General Regulations – 34%
• Plumbing Fixtures – 11%
• Water Supply and Distribution – 11%
• Sanitary Drainage – 9%
• Plumbing Vent Requirements – 7%
• Traps, Interceptors, and Separators – 7%
• Storm Drainage – 2%
• Gas Piping – 19%

Administration General Regulations is the largest content area at 34%. This category includes general installation requirements, code definitions and terms, plan reading, testing, and materials. Candidates should give this area substantial study time because these foundational subjects affect many different plumbing and gas installations.

Gas Piping is the second-largest category at 19%. This portion includes gas piping for service and distribution, gas-piping requirements for specific appliances and equipment, sources of combustion air and duct openings, and fuel-burning appliances, vents, and connectors.

Plumbing Fixtures represent 11% of the examination. This area includes water heaters, water closets and urinals, specialty fixtures, bathtubs, showers, sinks, and lavatories.

Water Supply and Distribution also represent 11%. Candidates should prepare for service distribution and piping, water supply and pressure, and protection of the potable water supply.

Sanitary Drainage accounts for 9% of the examination and includes building sanitary drainage, sumps and ejectors, and indirect and special waste systems.

Plumbing Vent Requirements represent 7%, and Traps, Interceptors, and Separators represent another 7%. Storm Drainage makes up the remaining 2%.

Because the G28 combines plumbing and fuel-gas topics, candidates need to recognize which code controls the situation described in each question. Efficient code selection can save significant time during the examination.

Open Book Test

The ICC G28 National Standard Journeyman Plumber with Gas examination is an open book test. Candidates have three hours to complete 70 multiple-choice questions and must follow current ICC examination rules regarding allowable reference materials.

The open-book format makes reference familiarity especially important because candidates must work with both the 2018 IPC and 2018 IFGC. Knowing which code applies before beginning a detailed search can improve efficiency.

Questions involving fixtures, potable water, drainage, plumbing vents, traps, interceptors, separators, or storm drainage should generally direct attention toward the 2018 International Plumbing Code.

Questions involving gas-service piping, gas-distribution piping, appliance gas connections, combustion air, fuel-burning equipment, vents, and connectors should direct attention toward the 2018 International Fuel Gas Code.

Candidates should become familiar with commonly used tables in both references. Plumbing questions may require pipe-sizing or drainage tables, while fuel-gas questions may require gas-pipe sizing or venting information.

The examination allows 180 minutes for 70 questions, providing an average of approximately two minutes and thirty-four seconds per question. Some questions may be answered quickly, while code-table, plan-reading, or sizing questions may require additional time.

Practice questions are particularly valuable when used as code-navigation drills. After answering a question, find the applicable section or table and review surrounding requirements. This helps reinforce both the technical rule and where it is located.

Licensing Steps

The G28 is an ICC National Standard contractor/trades examination. ICC administers the examination program, while state and local licensing authorities determine whether the G28 exam is accepted or required for a Journeyman Plumber with Gas credential.

1. Identify the correct credential. Determine whether the G28 National Standard Journeyman Plumber with Gas examination is required or accepted by the licensing jurisdiction where you intend to work.
2. Review jurisdiction requirements. Confirm any experience, application, registration, or other requirements imposed by the applicable licensing authority.
3. Prepare with the correct references. This product uses the 2018 International Plumbing Code and 2018 International Fuel Gas Code.
4. Study the official exam categories. Organize preparation around general regulations, fixtures, water supply, drainage, venting, traps, storm drainage, and gas piping.
5. Practice plan reading. Develop the ability to interpret plumbing-system information and connect plans to applicable code provisions.
6. Build two-code navigation skills. Practice identifying whether a question belongs in the IPC or IFGC before searching for the specific answer.
7. Use the online practice questions. Work through exam-oriented questions throughout the included 3-month access period.
8. Register for the G28 examination. Follow the current ICC contractor/trades registration and scheduling process.
9. Complete the exam. Answer the 70 multiple-choice questions within the 3-hour testing period.
10. Complete remaining licensing requirements. Follow any additional requirements established by the jurisdiction issuing the applicable Journeyman Plumber with Gas credential.

State Requirements

The ICC G28 National Standard Journeyman Plumber with Gas examination is a national contractor/trades examination. ICC provides the technical examination, but it is not itself a nationwide plumbing or gas license.

State and local jurisdictions determine whether the G28 exam is accepted for a specific Journeyman Plumber with Gas classification. The requirements for licensure can vary depending on the location where a candidate intends to work.

Passing the examination and receiving a license are separate processes. The G28 evaluates technical knowledge of plumbing and fuel-gas systems, while the applicable licensing authority determines eligibility and any additional requirements.

Candidates should identify the exact license or credential they need and confirm that the G28 examination is accepted for that classification before completing the licensing process.

Reference Books

• International Plumbing Code, 2018
  The primary plumbing reference for this G28 preparation product. It supports study of general regulations, materials, testing, plumbing fixtures, water heaters, potable water supply and distribution, sanitary drainage, vents, traps, interceptors, separators, indirect waste, special waste, and storm drainage.
• International Fuel Gas Code, 2018
  The fuel-gas reference used for study of gas service and distribution piping, gas-piping materials and sizing, appliance connections, combustion air, fuel-burning appliances, vents, connectors, and related installation requirements.

Test Information and Study Materials

This online practice-question product includes 3 months of access. The access period provides time to organize study around the eight major content areas and return to subjects that need additional practice.

Begin with Administration General Regulations because it represents 34% of the examination. Review general installation requirements, code definitions and terminology, plan reading, testing, and approved materials.

General Installation Requirements may affect many different systems. Candidates should understand code provisions involving installation, support, protection, workmanship, materials, accessibility, and related conditions that influence plumbing and fuel-gas work.

Code Definitions and Terms should also be studied carefully. Both the IPC and IFGC use defined terms that can affect how an exam question is interpreted. Understanding those definitions can make it easier to identify the correct chapter or requirement.

Plan Reading is another important part of Administration General Regulations. Candidates should practice interpreting plumbing layouts, piping arrangements, fixture locations, pipe sizes, risers, and other construction information.

Testing should be reviewed across the applicable systems. Understand where the codes address required testing and what requirements apply before plumbing or gas systems are placed into service.

Next, focus heavily on Gas Piping. At 19% of the examination, this category deserves regular study. Review service and distribution piping, materials, installation, sizing, pressure-related requirements, valves, appliance connections, and other fuel-gas provisions.

Gas-pipe sizing is a useful topic for repeated practice. Candidates should develop a consistent method for determining the applicable system conditions and selecting the correct sizing table instead of searching broadly through the code.

Study combustion air as part of the gas section. Candidates should understand how air requirements for fuel-burning appliances are addressed, including the use of openings and ducts where applicable.

Review fuel-burning appliances, vents, and connectors as well. These topics require candidates to understand how appliances safely receive fuel and discharge combustion products.

For Plumbing Fixtures, review water heaters, water closets, urinals, specialty fixtures, bathtubs, showers, sinks, lavatories, and applicable installation requirements.

For Water Supply and Distribution, study water-service piping, distribution systems, pressure requirements, potable-water protection, backflow prevention, valves, and applicable sizing methods.

Sanitary Drainage preparation should include building sanitary drainage, pipe sizing, drainage fixture units, cleanouts, slope, sumps, ejectors, indirect waste, and special waste systems.

For Plumbing Vent Requirements, study vent connections, grades, terminals, and the way vent systems protect trap seals and support drainage-system operation.

For Traps, Interceptors, and Separators, review trap installation, trap seals, interceptors, separators, and other requirements affecting special waste conditions.

Storm Drainage represents only 2% of the exam, but candidates should still understand where these requirements are found and how roof and storm drainage systems are addressed.

Timed practice is useful because the G28 requires candidates to balance plumbing and gas questions within a three-hour period. Practice identifying the correct code before beginning the lookup. This simple habit can prevent unnecessary searching in the wrong reference.

When reviewing missed questions, determine why the answer was missed. A candidate may know the plumbing concept but choose the wrong table, misunderstand a defined term, overlook a code exception, or search the IPC for a requirement found in the IFGC.

A productive study routine combines technical knowledge with repeated reference use. Rather than memorizing only a correct answer, locate the supporting code provision and understand why it applies to the situation described.

How 1 Exam Prep Helps You Reach Your Goal

1 Exam Prep supports G28 Journeyman Plumber with Gas candidates through organized study guidance, plumbing and gas trade-focused review, practice-oriented preparation, reference navigation, and confidence-building study structure.

The ICC G28 National Standard Journeyman Plumber with Gas Online Practice Questions are designed to help candidates actively work with both the 2018 International Plumbing Code and 2018 International Fuel Gas Code instead of relying only on passive reading.

Practice questions help candidates identify the topic being tested, determine which reference applies, locate the correct section or table, and apply the code requirement to the scenario presented.

The included 3 months of access provides time to establish a consistent preparation schedule. Candidates can rotate among general regulations, fixtures, water supply, drainage, plumbing venting, traps, gas piping, combustion air, and fuel-burning appliance requirements.

Plumbing and gas systems often intersect. A fuel-fired water heater, for example, can involve plumbing connections, potable water provisions, fuel-gas piping, combustion air, equipment installation, and venting. Organized study helps candidates understand how these systems work together.

Reference-navigation practice is especially important for this examination because candidates must work between two codes. Learning to identify the correct reference before searching can improve efficiency and help candidates make better use of the three-hour exam period.

1 Exam Prep provides structured preparation designed to support stronger plumbing knowledge, fuel-gas code familiarity, plan-reading skills, and more efficient reference navigation without guaranteeing a passing score, license, licensing approval, or examination outcome.

What is the ICC G28 exam?

The G28 is the ICC National Standard Journeyman Plumber with Gas examination. It combines Journeyman Plumber subjects with fuel-gas piping, combustion-air, appliance, and venting requirements.

How many questions are on the ICC G28 exam?

The G28 examination contains 70 multiple-choice questions.

How much time is allowed for the G28 exam?

Candidates have 3 hours to complete the examination.

Is the ICC G28 Journeyman Plumber with Gas exam open book?

Yes. The G28 examination is an open book test. Candidates must follow current ICC examination rules regarding permitted references and materials.

Which references are used for this preparation product?

This product uses the 2018 International Plumbing Code and 2018 International Fuel Gas Code.

What is the largest section of the G28 exam?

Administration General Regulations is the largest content area and represents 34% of the examination.

How much of the G28 exam covers gas piping?

Gas Piping represents 19% of the official examination outline.

Does the G28 exam cover combustion air?

Yes. Sources of combustion air and duct openings are included in the Gas Piping content area.

Does the G28 exam cover fuel-burning appliances and vents?

Yes. Fuel-burning appliances, vents, and connectors are included within the Gas Piping portion of the examination.

Does the G28 exam include plumbing fixtures?

Yes. Plumbing Fixtures represent 11% of the examination and include water heaters, water closets and urinals, specialty fixtures, bathtubs, showers, sinks, and lavatories.

Does the exam cover water supply and sanitary drainage?

Yes. Water Supply and Distribution represent 11%, while Sanitary Drainage represents 9% of the examination.

Does the G28 exam include plan reading?

Yes. Plan Reading is included within the Administration General Regulations content area.

How long do I have access to the online practice questions?

This product includes 3 months of access.

Does passing the G28 exam automatically provide a Journeyman Plumber with Gas license?

No. The G28 is an ICC contractor/trades examination. The applicable state or local licensing authority determines whether it accepts the examination and what additional licensing requirements apply.

How should I study for the ICC G28 exam?

Study by official content area, devote substantial time to Administration General Regulations and Gas Piping, practice navigating both the IPC and IFGC, strengthen plan-reading skills, and complete timed practice questions throughout the 3-month access period.

Why are online practice questions useful for the G28 exam?

Online practice questions help reinforce plumbing and fuel-gas code knowledge, identify weaker subjects, improve plan-reading skills, and develop faster navigation between the 2018 International Plumbing Code and 2018 International Fuel Gas Code.