Code Library › Volume 1 › Section 9.14 — Drainage
PART 9 — HOUSING AND SMALL BUILDINGSUpdated for the 2024 Ontario Building Code

9.14.4.1.Type of Granular Material

(1) Granular material used to drain the bottom of a foundation shall consist of a continuous layer of crushed stone or other coarse clean granular material containing (a) not more than 10% of material that will pass a 4 mm sieve, and (b) no pyritic material in a concentration that would adversely affect its stability or the performance of assemblies separating dissimilar environments.
← Previous9.14.3.3. InstallationNext →9.14.4.2. Installation

Common questions about this part of the code

What are the weeping tile requirements for house foundations in Ontario?Where must foundation drains and weeping tile discharge in Ontario?What are the surface grading requirements around a house in Ontario?

Understand this provision in seconds

BUILDAiD Assist explains any article of the building code in plain English — with exact citations, exceptions and related requirements.

Try BUILDAiD Beta

Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.