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

From: National Research Council Canada

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

Number

CSA O437.0-93, Grade O2

Title

Standards on OSB and Waferboard

Document

Standard

Publisher

CSA Group

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

Notes to table:

Footnote 1

Average values for a sample consisting of five panels. In addition, no individual panel in the five-panel sample shall have any property more than 20% below (or above in the case of thickness swell and linear expansion) the listed five-panel average value for that property.

Return to footnote 1 referrer

Footnote 2

For random waferboard:

“//” means parallel to the longer dimension of the panel; and
“┴” means perpendicular to the longer dimension.

For OSB (aligned) board:

“//” means parallel to the indicated direction of face alignment; and
“┴” means perpendicular to the indicated direction of face alignment.

Return to footnote 2 referrer

Footnote 3

“t” means the nominal thickness in millimetres.

Return to footnote 3 referrer

Installation requirements

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

do not contravene the National Building Code of Canada, or any provincial or territorial building codes; and
meet the requirements of CCMC minimum documentation requirements.

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)
Face orientation	Maximum framing member spacing (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:

is operated under a documented quality system; and
meets the minimum requirements of the CCMC minimum documentation requirements.

Labelling requirements

The CCMC requires that evaluation holders ensure that product labels:

reference the associated CCMC number or mark; and
meet the requirements of CCMC minimum documentation requirements.

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-L	Louisiana-Pacific Corporation	LP^® SmartSide^® ExpertFinish^® Panel, LP^® SmartSide^® ExpertFinish^® Vertical Siding, LP^® SmartSide^® Vertical Siding, LP^® SmartSide^® Panel, LP^® SmartSide^® Lap, 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

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