Installing New Sheathing over Old Sheathing
I am renovating a heated garage built in 1974. I am in zone 5. It has texture 111 as the sheathing that was painted in the 90’s and is peeling off. The interior is dry and the T111 is in good shape with no apparent rot or water damage on either side. I am planning on replacing the man door, garage doors, and windows and the interior walls will be rough cut kiln dried shiplap left natural (interior) as well as the final layer painted (exterior). There is currently no insulation in the building cavities so I can do whatever is most efficient. Here’s where I need the help/advice. Does it make sense to use an insulated sheathing Zip R product and go over the existing sheathing or just Tyvek house wrap and insulate from the interior? I’d like to go over the existing sheathing rather than strip it. Is the rough cut for the interior/exterior even a factor with any of the products? Any advice would be appreciated.
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