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Old 05-12-2015, 03:25 PM   #1
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Floor Joist


I'm remodeling my kitchen and have demoed it to the studs. On the ceiling I noticed the joists are 2 x 8 x 14' 6" on center. The floor in the bedroom above is not bad, but it could use a little "beefing up" while I have the floor open. As I have a span of 14' 6" and the joists setting on the top cap of the walls on both sides, I can only sister in a 2 x 8 along side of each joist. That new joist would only be sitting on about 2" of the wall to get it in (I've tried. I was going to glue (const. adhesive) and nail the new 2 x 8 to the side of the old 2 x8's.

Does this sound reasonable. I want to do something while I have a change and the ceiling is open.

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Old 05-12-2015, 03:27 PM   #2
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Sorry, don't know how to edit here

2 x 8's x 14'-6" span on 16" centers...sorry

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Old 05-12-2015, 03:32 PM   #3
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Bridging or bracing between the joist may give better bang for your bucks and be a lot easier to do.
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Old 05-12-2015, 09:41 PM   #4
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Your best two bye eights would only be rated for a span of around 13' 7" so you are somewhat under framed. As to what any issues are, what say you? When you walk on the floor upstairs do things bounce? Fell like you are going down? If not, no worries.

But if there is even a hint and stuff is en, no problem with sis tweeting, 2" bearing each end is more than sufficient, nail/screw or add glue, no difference either way. Ron
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Old 05-12-2015, 10:48 PM   #5
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Doubling would give a 3 x 6, rated at 64# per sq.ft if using 1500* Doug-Fir with 360* deflection, way better than existing 30#= good to go; http://publicecodes.cyberregs.com/ic...002_par017.htm

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Old 05-13-2015, 12:39 PM   #6
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I have blocking in between the joist now (2 x8). I was going to remove them and add the 2x8's along side and then put in new blocking (2 x8).

The floor above is not very bouncy. Not much more then any of the floor in the other rooms upstairs. It's only 5 joists as the other joists on the other side of the room are only about 12" on center and one is even doubled up! Not sure why, no wall or anything above it. But the kitchen may have had a "drop ceiling" at one time and those helped support it. That work may have been done before I moved it 15 plus years ago.

It's just If I have it open and a couple days of work and an extra $200, it might make sense to make sure that floor is good. I have time in the schedule to do it with no problems.

I might sleep better knowing the floor under me is solid!
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Old 05-13-2015, 01:01 PM   #7
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If I had it open I would sister the joist using some PL400 and screws or nails.Whichever is easier .For 5 joists and a little money you should have a very solid floor.
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Old 05-13-2015, 11:32 PM   #8
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Screws are not the correct fastener for sistering joists. Poor shear capacity vs nails. You'd be better off through-bolting than with screws, if nailing isn't an option.
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Old 05-15-2015, 07:56 AM   #9
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Renting a compressor and a palm nailer would pay for itself in time.
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Old 05-15-2015, 06:04 PM   #10
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I will glue (PL400 or equivalent) and nail the joists together (sister).

I have a nail gun I can get in there with and a compressor. It will shoot a 2" to 3 1/2" nail. So 3" should do. I'll have to buy 3". I have a box of 3 1/2" already. I could get away with 3 1/2" but what the heck

Thank you for your advice!

Still watching...about 3 weeks till I do the work.
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Old 05-17-2015, 04:43 PM   #11
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Opened up the entire ceiling and it turns out to be 2 x 8's (14-10" span) at 12" centers (center to center)!

Now I feel a little better. I think that meets code.

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