Rim joist has a screen in it

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Old 05-02-19, 04:51 PM
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Rim joist has a screen in it

I am preparing to replace a rim joist and sill plate that are rotted under a french door in a fixer-upper I bought. Why would the rim joist be shorter/narrower than the floor joists and have a screen in it? Picture attached.
 
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Old 05-03-19, 05:42 AM
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Probably for crawl space ventilation.
 
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Old 05-03-19, 05:52 AM
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This is the view from the full basement, and the sheathing/plywood under the siding covers it. It's my understanding there shouldn't be air movement through here but airtight insulation to prevent condensation. I live in Maine and the house was built in '92.
 
 

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