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-   -   Cathedral Ceiling pushing walls out (http://www.diychatroom.com/f9/cathedral-ceiling-pushing-walls-out-92088/)

Bigmessinroof 01-12-2011 12:42 PM

Cathedral Ceiling pushing walls out
 
I have a double story cathedral celing, 24' wide and 14' long. The walls are being pushed out. I intend to get 1/2" steel cable with turnbuckles and pull the walls back right at the plate (where the ceiling meets the wall). I am going to attach a 2x6 along the top of the wall, behind the 2x6 I am putting at 5" wide 3/8" thick steel plate then screwing it together with 5" German screws. I plan on doing this in two places, spliting in thirds.

Jackofall1 01-12-2011 12:49 PM

How far do they have to move?

Are the cables going to be left in place?

Sounds like it should work, I hope that both walls move equally.

Roofmaster417 01-12-2011 01:05 PM

Sounds proper ,but any reason what caused this?

CplDevilDog 01-12-2011 01:06 PM

If you are leaving the roofing in place, you may want to consider jacking the ridge beam from inside at the same time.

How do you plan to stabilize the walls once they are in?

Bigmessinroof 01-12-2011 01:21 PM

Not sure what exactly created this problem... I bought the house last Jan, and noticed the prob. about a month after i moved in, noticed cracking along the walls. the house was built in 2001. Either the ridge beam was undersized, or didnt use one. Only way to tell is to rip off existing oak ceiling.

Not sure if both moved equally, but that is a good point. I havnt measued the exact distance but I'd say about 4-6 inches of movment total. I'm going to leave the cable and turnbuckles in place, and cover with a fake oak box beam.

We've been debating the jacking technique... Pros and Cons to both. I dont want to jack up more than what i pull... i dont want to pull the wall away from rafters.

Right now the plan is to do about a half inch a day once we're ready to pull.

Roofmaster417 01-12-2011 01:42 PM

You obviously have a great plan but I always look at the other side of the spectrum when dealing with these types of issues.

1.What made this occur?
2.Can it be fixed properly and safely without even the slightest doubt with it reoccurring.

Bigmessinroof 01-12-2011 01:47 PM

I hope this will fix the problem... Without gutting the entire place I'm sure how we would figure out exactly what happened. I will try to contact the old owner/builder, but i dont feel he'll be much help.

thanks for the responses, any other ideas opinions??

Gary in WA 01-12-2011 03:53 PM

I would cut back the drywall at the ridge to measure the beam, if there is one. You should NOT have any side trust pushing on the wall with a BEAM, board, yes. It would definitely show sagging. Research the cable idea more to be safe, this will get you started; http://www.eng-tips.com/viewthread.cfm?qid=105386

http://www.eng-tips.com/viewthread.c...=162638&page=1

Gary

CplDevilDog 01-12-2011 05:33 PM

A ridge beam will prevent a cathedral ceiling from spreading if it is structurally bearing. It must have bearing posts in each of the gables. The other option is collar ties, which the cables should simulate.

How would you box the cables? The lower down (closer to the top plates) they are installed the more effective but I would think they will be a challenge to box.

BigJim 01-12-2011 06:01 PM

It really isn't a problem to box around the cables just notch out for the cable to recess up. The bottom of the false beam will be under the cable. My crew and I had to bring a spread back a couple of times where someone had messed up. You will need to jack the ridge close to the cable as you pull inward. Put pressure on the cable and jack at the same time if possible that way you won't jerk the ridge or plate away form the rafters. It will surprise you how much pressure it will take to get it all back in place.

CplDevilDog 01-12-2011 07:38 PM

I did one of these last year. We retrofitted collar ties wrapped in drywall. It was the first one I had done and no engineer on staff.

We used 10000 lb ratchet straps and a 20 ton jack.

It was pretty hairy :eek: But ultimately successful

Bigmessinroof 01-14-2011 11:17 AM

So far I see everyone is for jacking the center of the roof... anyone against? and why?

What about the idea of tighting the cable so the walls do not move anymore, but not pulling them back to plum? You can't see the walls are pushed out with your naked eye.


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