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Unread 05-24-2020, 09:20 AM   #7
Carbidetooth
Hmmmmm
 
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Join Date: Mar 2010
Location: Boise, ID
Posts: 1,547
Ron, if this is over crawl space, you could get a look at framing from there. But I'm guessing this is upper level of split.

You could also use a strong Neo magnet or stud finder on ceiling below to get idea of joist spacing. The neo magnet looks for drywall fasteners.

Do you know age of house? Building with solid lumber subfloor of any kind would be cost prohibitive now, not to mention the lumber available now is not that great.
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