OSB, Oriented Strand Board, is an engineered wood panel used for structural and many other industrial applications.
OSB is made of layers of wood strands oriented in different layers, combined with resin compounds to form a mat. The mat is then pressed together with heated platen presses to form a panel.
OSB typically comes in a panel that is 4’ wide by 8’ long. 9’ and 10’ lengths are available to be used as wall sheathing for today’s taller ceilings. The thickness of OSB comes in standardized sizes ranging from ¼” to 1-⅛”. OSB as a structural panel has their strength capabilities verified and stamped by third party-certification.
OSB TYPE
Four grades of OSB are defined in EN 300 in terms of their mechanical performance and relative resistance to moisture:
OSB/1 – General purpose boards and boards for interior fitments (including furniture) for use in dry conditions
OSB/2 – Load-bearing boards for use in dry conditions
OSB/3 – Load-bearing boards for use in humid conditions
OSB/4 – Heavy-duty load-bearing boards for use in humid conditions
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