PART 5 — ENVIRONMENTAL SEPARATIONUpdated for the 2024 Ontario Building Code
Try BUILDAiD Beta
5.4.1.2.Air Barrier Assemblies
(1) Except as provided in Sentences (2) and (3), air barrier assemblies not in contact with the ground shall
(a) conform with CAN/ULC-S742, “Standard for Air Barrier Assemblies – Specification,” and
(b) meet the selected Performance Class of Table 5.4.1.1.
(See Note A-5.4.1.2.(1))
(2) Air barrier assemblies not evaluated in accordance with CAN/ULC-S742, “Standard for Air Barrier Assemblies –
Specification,” shall be designed and constructed
(a) to meet or exceed the selected Performance Class of Table 5.4.1.1., and
(b) with at least one air barrier material intended to provide the primary resistance to air leakage that meets the
requirements of CAN/ULC-S741, “Standard for Air Barrier Materials – Specification.”
(See Note A-5.4.1.2.(2))
(3) Air barrier assemblies covered in Subsections 5.9.2., 5.9.3. and 5.9.4. shall meet the air barrier performance criteria
defined in those Subsections.
(4) Below-grade air barrier assemblies in contact with the ground shall minimize the ingress of airborne radon and other
soil gases. (See Note A-5.4.1.2.(4))
This provision includes a table — formatting is preserved from the source; refer to the official code for the authoritative layout.
Understand this provision in seconds
BUILDAiD Assist explains any article of the building code in plain English — with exact citations, exceptions and related requirements.
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.