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Ehren
Giant holes through exterior plywood sheathing

Hey, I got a house from the late 50s. In the bathroom, the builder cut two sets of 3" holes between each stud in the sheathing (1 high, and 1 low). I was wondering why this was done. The sheathing is rotten and I am replacing it. Do I need to put these holes back in? Should I take any other measure to solidify this bathroom while the walls are down? Thanks!

A. Spruce
Re: Giant holes through exterior plywood sheathing

Possibly for the installation of blown rock wool or cellulose insulation?

I wouldn't worry about the holes, just replace the sheathing and siding and you'll be fine.

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