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Old 12-10-2012, 08:52 PM   #16
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Bathroom Floor Help Please


Would you just sister it the width of the bathroom or the full 20 feet? Would it do any good to run 2x4 flat and flush with the top of joist in between? I was going to do that were my seem in the sheathing falls because I probably won't be using tongue and groove. What is better 23/32 plywood or 23/32 osb?

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Old 12-10-2012, 10:08 PM   #17
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Bathroom Floor Help Please


Sister the whole length if you can. The most flex will be towards the center of the span. I don't know how accessible the joists are.

You have to install blocking under all unsupported ends. (the 4' ends). I don't think 2x4 flat will be enough though. Why not install some joists under the ends?

You removed all the subfloor in the room right? If you wanna install just one layer you should go with t&g. Otherwise either do lots of blocking or also install an underlayment over the subfloor, 3/8" B/C or thicker.

3/4" Subfloor grade ply or OSB subfloor? Well I'd probably go with ply, but if you buy a premium OSB like AdvanTech you're doing good. Most would say premium OSB is even stiffer than ply. But with 12" o.c. I don't worry about that.

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Old 12-11-2012, 07:54 AM   #18
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Bathroom Floor Help Please


Before i did the sistering I would check all the joists and make sure none have sagged over the years. If they have now would be the perfect time to jack them up, then sister. May make your work later a lot easier
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Old 12-11-2012, 08:07 AM   #19
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Bathroom Floor Help Please


True. Thanks guys.

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