National Building Code of Canada

The National Building Code of Canada (NBCC) 2020 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 cladding product performance and installation requirements for construction in Canada.

NBCC provides general product and installation requirements for polymeric cladding.

Product Requirements

9.27.12.1 requires:

  1. vinyl siding be manufactured in accordance with ASTM D3679.
  2. insulated vinyl siding be manufactured in accordance with ASTM D7793.
  3. vinyl soffit be manufactured in accordance with ASTM D4477.
  4. vinyl siding, insulated vinyl siding and soffit to have flame spread rating when required by the code.

9.27.13.1 requires:

  1. polypropylene siding be manufactured in accordance with ASTM D7254.
  2. 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]

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.

Code at a Glance

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Technical Reports

2021 Polymeric Cladding Building Code Reference Guide

Our at-a-glance guide to the International, Florida and Canadian building codes governing the use of vinyl, polypropylene and insulated exterior cladding products.

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