OBC Plumbing All Buildings study plan
OBC Plumbing All Buildings · Give each week a clear focus.
8 weeks · About 7 hours per week
Drainage Systems, Traps and Cleanouts & Venting Systems and Venting Methods
Map the drainage-system layout logic by tracing a fixture drain from trap to building drain and labeling every fitting type encountered
Distinguish between trap seal protection requirements and prohibited trap configurations by writing a two-column comparison
Identify the code conditions that require a cleanout and state the maximum spacing and size rules from memory
Classify each venting method by its allowable application and produce a one-page decision tree for selecting a vent type
Your checkpoint
A hand-drawn riser diagram of a two-bathroom house with every trap, cleanout, and vent labeled by type and code basis
Drainage Systems, Traps and Cleanouts & Venting Systems and Venting Methods
Calculate fixture-unit loads for a sample multi-story building and verify drain and vent sizing against the applicable tables
Explain wet venting limits and common venting rules in writing without consulting notes
Diagnose five hypothetical venting defects and cite the specific corrective action for each
Compare stack venting, circuit venting, and island venting on cost, complexity, and code acceptance
Your checkpoint
A worked sizing packet for a three-story, six-unit building showing fixture units, drain sizes, and vent sizes with justifications
Water Supply and Water Distribution Systems & Plumbing Fixtures, Fixture Fittings and Fixture Requirements
Size a water service and distribution system for a sample building using demand-load and pressure-loss methods
List the minimum fixture clearances, spacing, and installation height rules for the common fixtures
Identify backflow prevention devices and state where each is required
Match each fixture type to its required trap size, water supply connection, and vent requirement
Your checkpoint
A fixture schedule for a mixed-use building listing every fixture, its supply demand, trap size, and required clearances
Water Supply and Water Distribution Systems & Health, Safety and Water Quality Requirements
Explain thermal expansion control and pressure-regulating valve requirements in a short written summary
Identify the cross-connection hazards in a commercial kitchen and specify the correct protection for each
State the water quality, disinfection, and testing requirements for potable water systems
Describe the material restrictions that apply to potable water piping and fittings
Your checkpoint
A cross-connection survey of a sample commercial kitchen with each hazard paired to a specific backflow protection device
Plumbing Fixtures, Fixture Fittings and Fixture Requirements & Storm Drainage Systems
Compute roof drain sizing from rainfall intensity and roof area for three different building footprints
Distinguish primary, secondary, and overflow storm drainage requirements and when each is mandatory
Identify the code rules for indirect waste receptors, air gaps, and air breaks
Explain the trap primer and trap seal maintenance requirements for floor drains and special fixtures
Your checkpoint
A storm drainage calculation sheet for three roof areas showing rainfall intensity, drain count, leader sizing, and overflow provisions
Special Plumbing Systems, Interceptors and Special Wastes & Plumbing Facilities for Persons with Disabilities and Barrier-Free Design
Classify each type of interceptor and separator by the waste stream it serves and its sizing basis
Design the grease interceptor sizing calculation for a sample restaurant and show the formula steps
List the accessibility requirements for plumbing fixtures including clear floor space, grab bar placement, and control location
Compare the accessibility rules for water closets, lavatories, and bathing fixtures in a side-by-side table
Your checkpoint
A restaurant special-waste plan showing grease interceptor sizing, venting, and location plus an accessible restroom layout checklist
General Requirements, Definitions and Administration & Inspection, Testing, Maintenance and Certification Requirements
Summarize the permit, inspection, and approval sequence from application through final sign-off
State the testing procedures for drainage, water supply, and storm systems including pressures and durations
Identify the qualifications and responsibilities of the responsible managing employee or license holder
List the record-keeping and maintenance documentation requirements for special systems
Your checkpoint
A one-page inspection and testing checklist covering each system type with required test method and acceptance criteria
General Requirements, Definitions and Administration & Plumbing Fixtures, Fixture Fittings and Fixture Requirements & Drainage Systems, Traps and Cleanouts & Venting Systems and Venting Methods & Water Supply and Water Distribution Systems & Special Plumbing Systems, Interceptors and Special Wastes & Health, Safety and Water Quality Requirements & Storm Drainage Systems & Plumbing Facilities for Persons with Disabilities and Barrier-Free Design & Inspection, Testing, Maintenance and Certification Requirements
Complete two full-length timed practice exams and score each by domain
Re-study the two weakest domains using targeted drills until accuracy exceeds 80 percent
Recite the key numeric thresholds for sizing, spacing, and testing from memory
Review every missed question and write the correct code principle behind each
Your checkpoint
A domain-by-domain score report from both practice exams with a written remediation log for every missed item
Milestones
Week 2: Score at least 75 percent on a 25-question drainage and venting drill without notes
Week 4: Correctly size a water distribution system and identify all backflow protections in a sample scenario with no reference errors
Week 6: Produce a complete special-waste and accessibility package that passes a self-review against a code checklist
Week 8: Achieve 80 percent or higher overall on two timed practice exams with no domain below 70 percent