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Unread 04-06-2019, 10:09 AM   #16
Kman
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What's below this floor?
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Unread 04-06-2019, 03:38 PM   #17
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floor deflection, joist span, etc

Other places I read that floor stiffness can be improved by gluing and nailing another layer of plywood over the subfloor at 90 degrees. Since the spacing and span of the joists are close to meeting spec, could additional plywood stiffen it enough?
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Unread 04-06-2019, 07:12 PM   #18
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Rob, all layers of structural subflooring must be oriented with the strength axis perpendicular to the joists. I recommend you avoid any of the places that advised you otherwise.

Adding a second layer of subflooring, while usually a very good idea for a ceramic tile installation, will do nothing at all to improve the design deflection of your floor joists.

The only way to improve the design deflection of what you've got is to shorten the unsupported span of the joists a little, which I believe is why Kevin asked the question in post #16 that you've not yet answered.

My opinion; worth price charged.
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Unread 04-06-2019, 08:54 PM   #19
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what's below this floor

Kevin, if I understand the question, under this floor is an unfinished basement storage room.
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Unread 04-06-2019, 11:11 PM   #20
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Sounds like a perfect opportunity to create the famous TYW Closet against one of the walls at the end of those joists. A sufficient header will support the joists a couple feet from the wall and you'll not only shorten the unsupported span and dramatically improve your joist deflection, but you'll provide a little extra storage space and make yourownself a he-row in the eyes of Mrs. Rob. It don't hardly git no better'n that.

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Unread 04-09-2019, 08:40 AM   #21
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Besides building the wall, you'd want to sheet it with something, like sheetrock, plywood, or OSB to keep the studs straight.

Without it, the studs can bow independently of each other and continue to allow too much flex in the joists.

Blocking between the joists can also help.
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Unread 04-12-2019, 08:57 AM   #22
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TYW closet?

Maybe the cool kids know what a TYW closet is, but I don't. I think I get the gist that I need to add a wall to shorten the span of the joists, but have been scratching my head at "TYW".
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Unread 04-12-2019, 11:08 AM   #23
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TYW is Tile Your World, the website we're on, Rob. Sorry about the cool-kids-only terminology.

Yes, we're talking about using a new support wall a couple feet from the existing support wall and making it into a closet wall. You can, of course, install a beam there instead to create the same effect, but using it to create a closet makes it a "feature" rather than an unwanted beam addition.

My opinion; worth price charged.
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Unread 04-12-2019, 01:55 PM   #24
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Do you guys think using a heat gun would speed up the process of removal ?
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