Code Library › Volume 1 › Section 9.30 — Flooring
PART 9 — HOUSING AND SMALL BUILDINGSUpdated for the 2024 Ontario Building Code

9.30.2.1.Required Underlay

(1) A panel-type underlay shall be provided under resilient flooring, parquet flooring, ceramic tile, felted-synthetic-fibre floor coverings or carpeting laid over lumber subflooring. (See Sentence 9.30.3.2.(1)) (2) Panel-type underlay shall be provided under resilient flooring, parquet flooring, felted-synthetic-fibre floor coverings or carpeting on panel-type subflooring whose edges are unsupported. (See Article 9.23.15.3.) (3) Panel-type underlay shall be provided under ceramic tile applied with adhesive. (4) Panel-type underlay shall be provided under resilient flooring on waferboard or strandboard subflooring.
← Previous9.30.1.4. Finish QualityNext →9.30.2.2. Materials and Thickness

Common questions about this part of the code

How thick does the subfloor need to be in an Ontario house?What kind of finish flooring is required in bathrooms and laundry rooms 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.