OBC DIVISION B · PART 5 — ENVIRONMENTAL SEPARATIONUpdated for the 2024 Ontario Building Code
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Section 5.9 — Standards
Full text of Section 5.9 (Standards) — Division B, Part 5 (Environmental Separation) of the 2024 Ontario Building Code, with every article reproduced below.
5.9.1.Applicable Standards
5.9.1.1.Compliance with Applicable Standards permalink →
(1) Except as provided in Sentence (2) and elsewhere in this Part, materials and components, and their installation, shall
conform to the requirements of the applicable standards in Table 5.9.1.1. where those materials or components are
(a) incorporated into environmental separators or assemblies exposed to the exterior, and
(b) installed to fulfill the requirements of this Part.
(See Note A-5.9.1.1.(1))
(2) The requirements for flame-spread ratings contained in thermal insulation standards shall be applied only as
required in Part 3.
Table 5.9.1.1.
Standards Applicable to Environmental Separators and Assemblies Exposed to the Exterior
Forming Part of Sentence 5.9.1.1.(1)
Issuing Agency Document Number Title of Document
ANSI A135.6 Engineered Wood Siding
ASME B18.6.1 Wood Screws (Inch Series)
ASTM A123 / A123M Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products
ASTM A153 / A153M Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware
Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by
ASTM A653 / A653M
the Hot-Dip Process
ASTM C4 Standard Specification for Clay Drain Tile and Perforated Clay Drain Tile
ASTM C73 Standard Specification for Calcium Silicate Brick (Sand-Lime Brick)
ASTM C126 Ceramic Glazed Structural Clay Facing Tile, Facing Brick, and Solid Masonry Units
ASTM C212 Standard Specification for Structural Clay Facing Tile
ASTM C412M Standard Specification for Concrete Drain Tile
ASTM C444M Standard Specification for Perforated Concrete Pipe
ASTM C553 Standard Specification for Mineral Fiber Blanket Thermal Insulation for Commercial and Industrial Applications
ASTM C612 Standard Specification for Mineral Fiber Block and Board Thermal Insulation
ASTM C700 Standard Specification for Vitrified Clay Pipe, Extra Strength, Standard Strength, and Perforated
ASTM C726 Standard Specification for Mineral Wool Roof Insulation Board
ASTM C834(1) Standard Specification for Latex Sealants
ASTM C840 Standard Specification for Application and Finishing of Gypsum Board
ASTM C920(1) Standard Specification for Elastomeric Joint Sealants
ASTM C991 Standard Specification for Flexible Fibrous Glass Insulation for Metal Buildings
Standard Specification for Steel Self-Piercing Tapping Screws for the Application of Gypsum Panel Products or
ASTM C1002
Metal Plaster Bases to Wood Studs or Steel Studs
ASTM C1177 / C1177M Standard Specification for Glass Mat Gypsum Substrate for Use as Sheathing
ASTM C1178 / C1178M Standard Specification for Coated Glass Mat Water-Resistant Gypsum Backing Panel
ASTM C1184(1) Standard Specification for Structural Silicone Sealants
ASTM C1280 Standard Specification for Application of Exterior Gypsum Panel Products for Use as Sheathing
ASTM C1311(1) Standard Specification for Solvent Release Sealants
Table 5.9.1.1. (Cont’d)
Standards Applicable to Environmental Separators and Assemblies Exposed to the Exterior
Forming Part of Sentence 5.9.1.1.(1)
Issuing Agency Document Number Title of Document
ASTM C1330(1) Standard Specification for Cylindrical Sealant Backing for Use with Cold Liquid-Applied Sealants
ASTM C1396 / C1396M(2) Standard Specification for Gypsum Board
ASTM C1658 / C1658M(3) Standard Specification for Glass Mat Gypsum Panels
ASTM D1227 / D1227M Standard Specification for Emulsified Asphalt Used as a Protective Coating for Roofing
ASTM D2178 / D2178M Standard Specification for Asphalt Glass Felt Used in Roofing and Waterproofing
ASTM D3019 / D3019M(4) Standard Specification for Lap Cement Used with Asphalt Roll Roofing, Non-Fibered, and Fibered
ASTM D4479 / D4479M Standard Specification for Asphalt Roof Coatings – Asbestos-Free
ASTM D4637 / D4637M Standard Specification for EPDM Sheet Used In Single-Ply Roof Membrane
ASTM D4811 / D4811M Standard Specification for Nonvulcanized (Uncured) Rubber Sheet Used as Roof Flashing
ASTM D6878 / D6878M Standard Specification for Thermoplastic Polyolefin Based Sheet Roofing
ASTM E2190 Standard Specification for Insulating Glass Unit Performance and Evaluation
BNQ BNQ 3624-115 Polyethylene (PE) Pipe and Fittings for Soil and Foundation Drainage
CGSB CAN/CGSB-11.3-M Hardboard
CGSB CAN/CGSB-12.1 Safety Glazing
CGSB CAN/CGSB-12.2-M Flat, Clear Sheet Glass
CGSB CAN/CGSB-12.3-M Flat, Clear Float Glass
CGSB CAN/CGSB-12.4-M Heat Absorbing Glass
CGSB CAN/CGSB-12.8 Insulating glass units
CGSB CAN/CGSB-12.9-M Spandrel glass
CGSB 37-GP-9Ma Primer, Asphalt, Unfilled, for Asphalt Roofing, Dampproofing and Waterproofing
CGSB CAN/CGSB-37.50-M Hot-Applied, Rubberized Asphalt for Roofing and Waterproofing
CGSB CAN/CGSB-37.54 Polyvinyl Chloride Roofing and Waterproofing Membrane
CGSB CAN/CGSB-37.58-M Membrane, Elastomeric, Cold-Applied Liquid, for Non-Exposed Use in Roofing and Waterproofing
CGSB CAN/CGSB-51.32-M Sheathing, Membrane, Breather Type
CGSB CAN/CGSB-51.33-M Vapour Barrier Sheet, Excluding Polyethylene, for Use in Building Construction
CGSB CAN/CGSB-51.34-M Vapour Barrier, Polyethylene Sheet for Use in Building Construction
CGSB CAN/CGSB-93.1-M Sheet, Aluminum Alloy, Prefinished, Residential
CGSB CAN/CGSB-93.2-M Prefinished Aluminum Siding, Soffits, and Fascia, for Residential Use
CSA A23.1 Concrete materials and methods of concrete construction
CSA CAN/CSA-A82 Fired masonry brick made from clay or shale
CSA CAN3-A93-M Natural Airflow Ventilators for Buildings
CSA CAN/CSA-A123.2 Asphalt-Coated Roofing Sheets
CSA A123.3 Asphalt Saturated Organic Roofing Felt
CSA CAN/CSA-A123.4 Asphalt for Constructing Built-Up Roof Coverings and Waterproofing Systems
CSA A123.5 Asphalt shingles made from glass felt and surfaced with mineral granules
CSA CAN/CSA-A123.16 Asphalt-coated glass-base sheets
CSA A123.17 Asphalt Glass Felt Used in Roofing and Waterproofing
CSA A123.23 Product specification for polymer-modified bitumen sheet, prefabricated and reinforced
CSA A123.51 Asphalt shingle application on roof slopes 1:6 and steeper
Table 5.9.1.1. (Cont’d)
Standards Applicable to Environmental Separators and Assemblies Exposed to the Exterior
Forming Part of Sentence 5.9.1.1.(1)
Issuing Agency Document Number Title of Document
CSA A165.1 Concrete block masonry units
CSA A165.2 Concrete brick masonry units
CSA A165.3 Prefaced concrete masonry units
CSA CAN/CSA-A179 Mortar and Grout for Unit Masonry
CSA CAN/CSA-A220 Series Concrete Roof Tiles
CSA CAN/CSA-A371 Masonry Construction for Buildings
CSA A3001 Cementitious Materials for Use in Concrete
CSA B182.1 Plastic drain and sewer pipe and pipe fittings
CSA G40.21 Structural quality steel
CSA CAN/CSA-G401 Corrugated steel pipe products
CSA CAN/CSA-O80 Series Wood preservation
CSA O118.1 Western Red Cedar Shakes and Shingles
CSA O118.2 Eastern White Cedar Shingles
CSA O121 Douglas fir plywood
CSA O141 Softwood Lumber
CSA O151 Canadian softwood plywood
CSA O153 Poplar plywood
CSA O325 Construction sheathing
CSA O437.0 OSB and Waferboard
CSA S478 Durability in buildings
HPVA ANSI/HPVA HP-1 American National Standard for Hardwood and Decorative Plywood
ULC CAN/ULC-S701.1 Standard for Thermal Insulation, Polystyrene Boards
ULC CAN/ULC-S702.1 Standard for Mineral Fibre Thermal Insulation for Buildings, Part 1: Material Specification
ULC CAN/ULC-S703 Standard for Cellulose Fibre Insulation (CFI) for Buildings
ULC CAN/ULC-S704.1 Standard for Thermal Insulation, Polyurethane and Polyisocyanurate, Boards, Faced
Standard for Thermal Insulation – Spray Applied Rigid Polyurethane Foam, Medium Density – Material
ULC CAN/ULC-S705.1
Specification
ULC CAN/ULC-S705.2 Standard for Thermal Insulation – Spray Applied Rigid Polyurethane Foam, Medium Density – Application
ULC CAN/ULC-S706.1 Standard for Wood Fibre Insulating Boards for Buildings
ULC CAN/ULC-S710.1 Standard for Bead-Applied One Component Polyurethane Air Sealant Foam, Part 1: Material Specification
ULC CAN/ULC-S711.1 Standard for Bead-Applied Two Component Polyurethane Air Sealant Foam, Part 1: Material Specification
ULC CAN/ULC-S717.1 Standard for Flat Wall Insulating Concrete Form (ICF) Units – Material Properties
Notes to Table 5.9.1.1.:
(1) See Note A-Table 5.9.1.1.
(2) The flame-spread rating of gypsum board shall be determined in accordance with CAN/ULC-S102, “Test for Surface Burning Characteristics of Building
Materials and Assemblies,” in lieu of ASTM E84 “Surface Burning Characteristics of Building Materials”, as indicated in ASTM C1396 / C1396M “Gypsum
Board.”
(3) The flame-spread rating of glass mat gypsum panels shall be determined in accordance with CAN/ULC-S102 “Test for Surface Burning Characteristics of Building
Materials and Assemblies,” in lieu of ASTM E84, “Surface Burning Characteristics of Building Materials,” as indicated in ASTM C1658 / C1658M “Glass Mat
Gypsum Panels.”
(4) For the purpose of compliance with Part 5, ASTM D3019 / D3019M, “Lap Cement used with Asphalt Roll Roofing, Non-Fibered, Asbestos-Fibered, and Non-Asbestos-
Fibered,” applies only with respect to non-fibered and non-asbestos-fibered (Types I and II) of asphalt roll roofing.
This provision includes a table — formatting is preserved from the source; refer to the official code for the authoritative layout.
5.9.2.Windows, Doors and Skylights
5.9.2.1.General permalink →
(1) This Subsection applies to windows, doors and skylights, including their components, that separate
(a) interior space from exterior space, or
(b) environmentally dissimilar interior spaces.
(2) For the purpose of this Subsection, the term “skylight” refers to unit skylights, roof windows and tubular daylighting
devices.
(3) Where a wired glass assembly is installed in a required fire separation, it need not conform to the requirements of
this Subsection. (See Note A-5.9.2.1.(3))
5.9.2.2.Applicable Standards (See Note 5.9.2.2.) permalink →
(1) Windows, doors and skylights shall conform to the requirements in
(a) AAMA/WDMA/CSA 101/I.S.2/A440, “North American Fenestration Standard/Specification for windows, doors,
and skylights” (Harmonized Standard), and
(b) CSA A440S1, “Canadian Supplement to AAMA/WDMA/CSA 101/I.S.2/A440-17, North American Fenestration
Standard/Specification for windows, doors, and skylights.”
(2) Performance grades for windows, doors and skylights shall be selected according to the Canadian Supplement
referenced in Clause (1)(b) so as to be appropriate for the conditions and geographic location in which the window, door
or skylight will be installed.
(3) Windows, doors and skylights shall conform to the performance grades selected in Sentence (2) when tested in
accordance with the Harmonized Standard referenced in Clause (1)(a).
5.9.2.3.Structural Loads, Air Leakage and Water Penetration permalink →
(1) Windows, doors, skylights and their components shall be designed and constructed in accordance with
(a) Article 5.1.4.1., Section 5.4. and Section 5.6., where they are not covered in the scope of the standards listed in
Sentence 5.9.2.2.(1), or
(b) Article 5.9.2.2., where they are covered in the scope of the standards listed in Sentence 5.9.2.2.(1).
(See Note A-5.9.2.3.(1))
5.9.2.4.Heat Transfer permalink →
(1) Windows, doors and skylights shall meet the heat transfer performance requirements stated in Section 5.3. (See
Note A-5.3.1.2.))
(2) Except as provided in Sentence (3), all metal-framed glazed assemblies separating interior conditioned space from
interior unconditioned space or exterior space shall incorporate a thermal break to minimize condensation.
(3) Metal-framed glazed assemblies need not comply with Sentence (2) where these assemblies are
(a) storm windows or doors, or
(b) windows or doors that are required to have a fire-protection rating.
(See Note A-5.9.2.4.(3))
5.9.3.Other Fenestration Assemblies (See Note A-5.9.3.)
5.9.3.1.Definition permalink →
(1) In this Subsection, “other fenestration assemblies” means curtain walls, window walls, storefronts and glazed
architectural structures. (See Note A-5.9.3.1.(1))
5.9.3.2.Structural and Environmental Loads permalink →
(1) Other fenestration assemblies and their components shall be designed and constructed in accordance with Article
5.1.4.1. (See Note A-5.9.3.2.(1))
5.9.3.3.Heat Transfer permalink →
(1) Other fenestration assemblies and their components shall meet the heat transfer performance requirements stated in
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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.