MarkhamBuilding InspectionsInspections

Concrete Mixes For Housing

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: Concrete Mixes for Housing
For: builder
Building types: All building types
Pages: 2
Instruments: CSA A23.1, Concrete Materials and Methods or Concrete Construction · CAN/CSA A3001, Cementitious Materials for Use in Concrete

Overview

Builder Tip No. 52 of the City of Markham, dated January 1, 2025, one of the City's housing tips for permits under the 2024 Ontario Building Code. It quotes Articles 9.3.1.1., 9.3.1.2. and 9.3.1.7. on R class concrete under CSA A23.1, cement under CAN/CSA A3001, and the maximum water-to-cementing-materials ratios of 0.45, 0.65 and 0.70 for garage floors, interior floors and other uses. Its objective notes that this ratio replaced the slump test and that inspectors may ask for a batch card or third-party test.

What it covers

9.3.1. Concrete
9.3.1.1. General
9.3.1.2. Cement
9.3.1.7. Concrete Mixes
Objective

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