MarkhamBuilding InspectionsInspections

Slope Of Roof Surfaces

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: Slope of Roof Surfaces
For: builder
Building types: All building types
Pages: 2

Overview

Markham Building Standards Department Builder Tip No. 58, dated January 1, 2025 and updated to the 2024 OBC, on how steep a roof surface is for each roofing type; the City lists it with its housing tips under the 2024 Ontario Building Code. It quotes Article 9.26.3.1., Slope, with Table 9.26.3.1., lower slopes for asphalt and gravel roofs with roof drains and for low-slope profiled metal cladding, and slope away from exterior walls and guards. Its objective explains water ingress, ponding and positive slope after frame shrinkage.

What it covers

9.26.3.1. Slope
Objective

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