MarkhamBuilding InspectionsInspections

Protection From Precipitation – Residential Occupancy (First & Second Planes Of Protection)

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
Also called: Protection from Precipitation – Residential Occupancy (First & Second Planes of Protection)
For: builder
Building types: All building types
Pages: 3

Overview

Markham's Builder Tip No. 61, dated January 1, 2025 and updated to the 2024 OBC, on rain and snow protection of exterior walls around homes, filed with the City's housing tips under the 2024 Ontario Building Code; a companion tip on the second plane alone sits with the non-housing tips. It quotes Articles 9.27.2.2., 9.27.2.3. and 9.27.3.1. on exterior cladding assemblies with a first plane of protection and a second plane, the drainage plane and flashing, and protection kept at windows, doors, ducts and other penetrations.

What it covers

9.27.2.2. Minimum Protection from Precipitation Ingress
9.27.2.3. First and Second Planes of Protection
9.27.3.1. Elements of the Second Plane of Protection
Objective

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