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Old 07-25-2012, 09:53 AM   #16
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bowed ceiling joists :(


I'm not a structural engineer........but just thinking here.

This might solve the structural issue and the cosmetic issue at the same time..........and may not cost as much as you think.
Install a 2x8 beam above and in the center of the 2x4's.
Then jack up the bow in the 2x4's to the beam. Then strap each 2x4 to the beam. You may be able to do this without replacing the sheetrock.
I have used an auto trolley jack and a 2x4 "Preacher" to accomplish this before. The tough part is in getting the beam into the attic space. Just make sure that the beam is over a stud and the weight transferred to the foundation. If you have a roof sag, this can be also supported diagonally with struts to the beam.


Alternatively, if this is a cosmetic issue and you can live with "springy joists", then why not fur down with laths in an opposing direction across the 2x4 joists and shim until straight, then re-hang the sheet rock. However, I think this would take more time than solution #1

Mike

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Old 07-25-2012, 09:22 PM   #17
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bowed ceiling joists :(


that would put the load in a bad place = the center of the floor joists. i am going to sister the middle 6 joists with, probably, 2x8's. i am going to support the main floor with a jack in the basement. then a jack in the room with a beam that will lift those 6 joists. get it as flat as reasonably possible. then nail away. this will put the load on the foundation and main beam in the basement. getting the 14x2x8's into the attic, its a straight shot. just gotta use the muscles.
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Old 07-26-2012, 08:52 PM   #18
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bowed ceiling joists :(


ok. i now have 2x6x14'. i started putting them in, well, just one today. the 2x6 seems plenty stiff enough. i will have pics during the weekend.
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Old 07-28-2012, 08:51 AM   #19
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bowed ceiling joists :(


well, its not working out well. i jacked up the ceiling quit a bit. and it flattened the joists in the middle 10'. but at the 1' on each end, the joist is warped down about 1". and i do not see any reasonable way to get the joists straightened out. so i have to come up with plan B. i may build framing for a new ceiling, under the original. this would use about 10" of height, not a big deal. i am thinking i would do this in 2 bedrooms, as the current ceiling finish is kinda damaged. but the living room and dining room, the ceilign finish is ok. so i would just sister in the attic to hold the weight of the new insulation going in.
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Old 07-29-2012, 07:00 PM   #20
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bowed ceiling joists :(


Quote:
Originally Posted by joecaption View Post
A far simpler way is to remove the plaster and lath and sister new wider joist.
You would have to notch the ends so there lower but can still rest on the top plates.
joe. this is what i did today. i was really worried about how much work it would be. but all the work was just cleaning up. getting the P&L on the floor, i had about 10 mins total, for the whole ceiling. it was that easy. by far, the easiest part of this task.

and how dare i not post pics
Attached Thumbnails
bowed ceiling joists :(-img_1796.jpg   bowed ceiling joists :(-img_1795.jpg  
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Old 07-29-2012, 07:03 PM   #21
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bowed ceiling joists :(


oh, the worst bow was 1 3/4". the one in the middle.
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Old 07-30-2012, 06:09 PM   #22
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bowed ceiling joists :(


I have a house with very similar construction and I have the same issue. I would love to hear how yours works out for you. Mine is rough 2x6's spanning about 13 feet, spaced around 20 inches apart. The floor above noticeably shakes when you walk, and I have not measured the sag.

I was probably going to sister the jousts just like you are, so keep us updated. Also, how are you attaching your sister joists on there?

PSURyan

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