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jjpreston

09:22PM | 11/01/07
Member Since: 11/01/07
3 lifetime posts
Bvmisc

Subfloor over I-joists

Tags: Miscellaneous
Installing 3/4" T&G subfloor over 11-7/8" engineered wood I-joists and not sure how skinny the last row of subfloor can be. If I make no adjustments I'll have a last row of subfloor that is only 10" wide. While that row will sit on I-joists that are 16" on center with one 2x6 squash block at each joist, not sure that's wide enough. Can adjust at center beam to make it closer to 2 feet wide, but a lot more work and will waste material. Any thoughts?

fool4jesus

05:45AM | 11/08/07
Member Since: 06/20/05
53 lifetime posts
I don't know that I'd take that as Gospel. I'm not sure what the squash blocks will do for you: it seems to me that the major problem is the narrow subfloor board. I guess the SB's give the joists some more width to nail to.

What are you putting over the subfloor? If it's hardwood or something with an underlayment (e.g. sheet flooring), it seems to me that it would be OK but YMMV. If it's just carpet, I think I'd bite the bullet and make it two joists wide.

jjpreston

07:37PM | 11/08/07
Member Since: 11/01/07
3 lifetime posts
The skinny row (10") of subflooring is actually going to run perpendicular to the joists. Regardless, I think you're right and I'll do the extra to play it safe, as there's nothing but carpet going on top. Thanks for your input.

tlund72

01:23PM | 03/22/09
Member Since: 03/21/09
1 lifetime posts
This is an old post, but for those who read it to learn from it:

We in commercial construction usually go by a rule that dictates that the last or first row of ply or osb, should be at least 2' wide. You should cut back the previous row to be 2' from the wall and end thus ending on a 2' sheet.
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