National Building Code of Canada (NBC)
The NBC establishes technical provisions for the design and construction of new buildings. It also applies to the alteration, change of use and demolition of existing buildings.
Here are the codes that impact polymeric exteriors’ product performance and installation requirements when working in Canada.
NBC provides general product and installation requirements for polymeric exteriors.
Product Requirements (NBC 2020 9.27)
- 9.27.12.1[1] states that vinyl siding shall be manufactured in accordance with ASTM D3679.
- 9.27.12.1[2] states that insulated vinyl siding shall be manufactured in accordance with ASTM D7793.
- 9.27.12.1[3] states that vinyl soffit shall be manufactured in accordance with ASTM D4477.
- 9.27.13.1[1] states that polypropylene siding shall be manufactured in accordance with ASTM D7254.
- 9.27.12.1[4] requires vinyl siding, (backed vinyl siding), insulated vinyl siding and vinyl soffit to have a flame spread rating when required by the code.
- 9.27.13.1[2] requires polypropylene siding to have a flame spread rating when required by the code.
Vinyl Siding
ASTM D3679 — 9.27.12.1[1]
Insulated Vinyl Siding
ASTM D7793 — 9.27.12.1[2]
Polypropylene Siding
ASTM D7254 — 9.27.13.1[1]
Backed Vinyl Siding
ASTM D7445 — CODE COMPLIANCE REPORTS
Installation Requirements
- 9.27.5 states prescriptive requirements for the installation of vinyl siding, insulated vinyl siding and polypropylene siding. Nails shall be a minimum of 38 mm long and spaced no greater than 400 mm, and all fasteners shall be installed in the center of the nail slot.
- 9.27.5.7 [2] specifies that all fasteners must be installed into a nail-holding base, with a minimum depth of 32 mm or into framing.
Building Codes and Product Certification / Technical Information
2025 Polymeric Cladding Building Code Reference Guide
An at-a-glance breakdown of the International, Florida and Canadian building codes, performance information, and installation requirements for polymeric cladding.
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