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Unread 05-23-2020, 08:20 AM   #2
Carbidetooth
Hmmmmm
 
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Join Date: Mar 2010
Location: Boise, ID
Posts: 1,547
That's really unusual construction. How old is the house and what part of the country?
2x10s on the flat would have lots of cupping, I would think, and that would tend to create gaps between tops of joists and subfloor...not a good starting place.

Off hand, I would disagree with your carp, and would strongly recommend you consider a minimum of 1/2" ply with on top of that after some intensive buttoning down or replacement of the subfloor. Depending on cupping, I might want to run a saw kerf the length of 2x10 to let them pull tight against joists.

All of this in my imagination at this point, having never seen such a subfloor. Photos would be helpful, both context and close-up.
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Silicone (not silicon) Sealant Ranger
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