MarkhamBuilding InspectionsInspections

Wet Venting

Published by City of Markham

This is the City of Markham’s document, as published on its website on 18 October 2026. The municipality may have changed it since: check the current version at the source. Legal notice

Type
Guide
Published by
City of Markham
Date
January 1, 2025
For
builder
Building types
All building types
Pages
2

Overview

Builder Tip Issue No. 36 from the City of Markham Building Standards Department, dated January 1, 2025, and filed with its 2024 Ontario Building Code housing tips, on drainage pipes that serve as wet vents. It quotes Article 7.5.2.1., Clauses (a) to (k): hydraulic load, at most two wet-vented water closets downstream of other fixtures, NPS 2 trap arms, offsets and pipe size. The Objective and a section drawing show a basin and bathtub wet vented by a water closet, with the uppermost fixture on the vertical vent.

What it covers

  • 7.5.2.1. Wet Venting
  • Objective
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Wet Venting

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