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Aug 9, 2020
How do I repair old wood?

Mason Hearn of HomeMasons, Inc. PRO answered:

Aug 18, 2020

That is Oriented Strand Board (OSB), typically used for sheathing.  Looks like it has been used exposed to weather, which is not its intended use.  There is no reasonable repair for that, other than replacement... with materials suitable for whatever the application might be.  Call a professional contractor.

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