OBC Plumbing House study guide
OBC Plumbing House · Work through your exam, one topic at a time.
The OBC Plumbing House credential is a knowledge assessment for plumbers and plumbing contractors who work on projects governed by the Ontario Building Code (OBC). It tests whether a candidate can read code requirements and apply them to real installations: how drains, wastes, and vents are sized and arranged, how potable water is distributed and protected from contamination, how fixtures and appliances are set and connected, how storm and special waste is handled, which materials and joints are permitted, and how plumbing interfaces with fire protection and other trades. The OBC Plumbing House study guide has 10 sections and about 2,551 words.
01Plumbing Terminology, Definitions, and Symbols
Codes are written in defined words. A question may turn on whether a pipe is a "fixture drain" or a "fixture branch," or whether a fitting is a "sanitary tee" or a "vent tee." Learn definitions as functional descriptions, not memorized labels: what the component does, where it sits in the system, and what it connects.
327 words, about 2 min02General Regulations, Permits, and Inspections
Plumbing work is governed by an adopted code, local amendments, and the authority having jurisdiction (AHJ). Understand the permit process: application, plan review, permit issuance, inspections at defined stages, and final approval.
291 words, about 1 min03Drainage, Waste, and Vent Systems
Gravity drainage relies on slope, pipe sizing, and proper fittings. Know that horizontal drainage pipe slopes toward the drain, and that fittings must direct flow without creating traps or restrictions.
284 words, about 1 min04Water Supply and Distribution Systems
Water supply design balances pressure, flow, and sizing. Know the terms: static pressure, residual pressure, friction loss, and developed length.
248 words, about 1 min05Fixtures, Fixture Fittings, and Appliances
Fixtures must be approved, have smooth and impervious surfaces, and be installed with clearances and access for cleaning. Know water closet, lavatory, sink, bathtub, shower, floor drain, and drinking fountain requirements.
253 words, about 1 min06Storm Drainage and Special Waste Systems
Storm drainage removes rainwater from roofs, courts, and paved areas. Know roof drains, leaders (downspouts), area drains, and storm building drains.
239 words, about 1 min07Plumbing Materials, Joints, and Connections
Know common piping materials: cast iron, PVC, ABS, copper, PEX, CPVC, galvanized steel, and their approved uses. Understand that material must be compatible with the waste or water it carries and with the joining method.
244 words, about 1 min08Fire Protection and Specialty Plumbing Systems
Plumbing candidates should understand standpipes, sprinkler systems, fire department connections, and the difference between wet, dry, and pre-action systems. Know that fire protection piping is governed by its own standards but must coordinate with the water supply.
219 words, about 1 min09Health, Safety, and Sanitation Requirements
Plumbing protects public health by preventing contamination. Key concepts: cross-connection, backflow, backsiphonage, air gap, and flood level rim.
224 words, about 1 min10Related Building Code and Trade Coordination
Plumbing does not stand alone. Pipes penetrate fire-rated assemblies, structural members, and mechanical spaces.
222 words, about 1 min