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[CCMC evaluation requirements] CSA O437.0-93, Grade O2

This document provides a summary of the minimum requirements imposed by the Canadian Construction Materials Centre (CCMC) for all evaluations based on the below criteria document. Additional requirements may be imposed by the CCMC when necessary for a particular evaluation, and are detailed in the individual evaluation.

Criteria document

Scope

These evaluations apply to a class of mat-formed panelboards made predominantly of wood wafers or strands of minimum and controlled length, controlled thickness, and variable or predetermined width which are bonded together with a waterproof and boilproof binder. The class comprises two types: waferboard, which consists wholly of randomly placed wafers or strands, and oriented strandboard (OSB), which contains layers of aligned wafers or strands.
 

Material requirements

The evaluation holder must demonstrate that the product meets the following requirements (additional requirements may be imposed by the CCMC when necessary, and are detailed in the individual evaluation):

The standard prescribes minimum or maximum, physical and mechanical property levels for OSB and waferboard grade O-2, which is not end-use specific.

Table 1. Property requirements Footnote (1)
Property Unit Direction Footnote (2) Grade O-2
Modulus of rupture MPa // ≥ 29.0
Modulus of rupture MPa ≥ 12.4
Modulus of elasticity MPa // ≥ 5 500
Modulus of elasticity MPa ≥ 1 500
Internal bond MPa - ≥ 0.345
Bond durability – modulus of rupture after 2 h boil MPa // ≥ 14.5
Bond durability – modulus of rupture after 2 h boil MPa ≥ 6.2
Thickness swell – 24 h soak % - ≤ 15
Thickness swell – 24 h soak % - ≤ 10
Linear expansion – oven dry to saturated % // ≤ 0.35
Linear expansion – oven dry to saturated % ≤ 0.50
Lateral nail resistance Footnote (3) N // ≥ 70t
Lateral nail resistance Footnote (3) N ≥ 70t

© CSA Group. This information is excerpted from the referenced standard published by CSA Group. The full version of the standard should be referenced, and can be obtained from CSA Group.

Installation requirements

The CCMC requires that evaluation holders provide instructions for the installation of the product(s) that:

Additionally, installation of cladding panels conforming to CSA O437.0-93, “OSB and Waferboard,” must be per the requirements below. 

Table 2. Requirements for grade O-2
Face orientation Maximum framing member spacing
(mm)
Nominal thickness (mm)
4.0 4.7 6.0 7.5 8.0 9.5 11.0 12.5 15.5 18.5
Parallel to support Applied directly to sheathing n/a Footnote (1) n/a X Footnote (2) X X X X X X X
Parallel to support 400 n/a n/a n/a n/a X X X X X X
Parallel to support 600 n/a n/a n/a n/a n/a n/a X X X X
Perpendicular to support 400 n/a n/a X X X X X X X X
Perpendicular to support 600 n/a n/a n/a n/a X X X X X X

Manufacturing requirements

The CCMC requires that evaluation holders, at a minimum, demonstrate that the associated production process:

Labelling requirements

The CCMC requires that evaluation holders ensure that product labels:

Additionally, as required by the standard, the OSB and waferboard must be marked with the following information:

  • manufacturer’s name or logo;
  • appropriate CSA designation;
  • words “Exterior Bond” or “Ext Bond”;
  • grade mark;
  • direction of face alignment; and
  • nominal thickness.

Classification information

Products falling within the scope of this document are commonly classified by:

MasterFormat®

  • 07 46 00 Siding
  • 07 46 23 Wood Siding

Published CCMC evaluations

The following products have been evaluated to these requirements by the CCMC:

CCMC number:Manufacturer:Product names:
11826-LLouisiana-Pacific Corporation LP®SmartSide®ExpertFinish®Panel, LP®SmartSide®ExpertFinish®Vertical Siding, LP®SmartSide®Vertical Siding, LP®SmartSide®Panel, LP®SmartSide®Lap, LP®SmartSide®ExpertFinish®Nickel Gap, LP®SmartSide®Nickel Gap, LP®SmartSide®ExpertFinish®Lap

Code references

National Building Code of Canada 2015

Code references Code provision
9.27.10.1.(1)OSB and waferboard cladding shall confor ...
Table 5.9.1.1.Standards Applicable to Environmental Separators and Assemblies Exposed to the Exterior

Page details

From: National Research Council Canada

Date modified: