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dewgubbe

Posted 1/31/2017 20:26 (#5808197)
Subject: Hip Roof repair help - sagging barn roof lean-to

Northeast Nebraska

Trying to figure out how to repair a sagging lean-to roof on a barn. The lean-to wraps around the barn's east and south side, and has a hip rafter on the southeast and southwest corners (see image, top is north)

I didnt take any measurements or pictures since Im just in the thinking stage.

The common rafters are sagging some, but not too bad. The hip rafters are sagging very badly though, I'd estimate 6" of sag in the middle. All the rafters are 2x6. The lean-to is 16' wide. I'm estimating a 5/12 roof pitch, but not sure, need to measure.

I need ideas on how to get this roof straightened back out. I'm assuming everything was built too small. Probably needed 2x12 for the hip rafters. Is there an easy fix, or do I just need to bite the bullet, support the roof, and replace the hip rafters with a board heavy enough to support the weight without sagging?

For the common rafters, could I run a 2x6 flat from the outer lean-to wall back to the main poles of the barn, and then build a web (truss) inside to support the load? I need to keep it clear span. Thanks

Edited by dewgubbe 1/31/2017 20:38

(hip roof.gif)

(barn.JPG)

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hip roof.gif (60KB - 350 downloads)
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DRester

Posted 1/31/2017 21:07 (#5808323 - in reply to #5808197)
Subject: RE: Hip Roof repair help - sagging barn roof lean-to

Franklinton, LA

If this was my barn I would try using a jack or two and straighten the hip rafter. I realize that this sagging occurred over a period of years and jacking will probably crack the hip rafter. My next suggestion would be to place a 2 X 10 or 2 X 12 under the straightened and probably broken hip rafter. You can then nail some short pieces of 2 X 6 perpendicular to the new and old hip rafters. A 24" spacing for the short pieces of 2 X 6 should be adequate. I hope you have enough clearance to get a nail gun in place to nail the 2 X 6 to the side of the straightened hip rafters.

You may want to check the rafters attached to the hip rafter. The jacking process may have damaged these rafters or loosened the nails where they are attached to the hip rafter. These rafters can be easily repaired by scabbing a 6 - 8' long 2 X 6 on the side.

This is my suggestion. I feel certain other posters will also have some good suggestions.

Haleiwa

Posted 2/1/2017 00:03 (#5808606 - in reply to #5808197)
Subject: RE: Hip Roof repair help - sagging barn roof lean-to

West Chazy, New York

Jack each rafter up to straight and sister it , maybe on each side if you think the original was too light. If you can get lumber reasonable, that's the easiest way. If you think steel would work better, lag some angle iron to the side of the rafter. Get a shop to bend you some 3/16 2 by 5 angles. Heavy to put up, but won't sag like lumber will. Drill the holes in the steel first, plus a few extra holes to nail it in place to hold it, then put in the lag screws. Maybe for the hips use steel on each side and through bolt it so it can't flex.
At some point you have to figure if it is worth trying to repair or just tear off and start over.

rollinsorchards

Posted 2/1/2017 07:25 (#5808822 - in reply to #5808197)
Subject: RE: Hip Roof repair help - sagging barn roof lean-to

Garland Maine

We had a roof get damaged in 98. Fiddled with it every 3 or 4 years trying to keep it from sagging more and finally gave up and replaced it. The roofing needed to be replaced anyway so we just ripped off the boards and rafters and replaced. Took twice as long and cost twice as much as I estimated but the barn should last another 150 years now. To be fair I could have built a new pole shed for half what i spent doing the roof, but it wouldn't have the same character, and the barn would have had to be torn down eventually anyway.

Now in your case where the common rafters are still solid you may be able to jack and brace the hip rafters. I would first start with strengthening the closest straight part of the roof. Go to the nearest common rafter that is not sagged and add a sister 2*6 to it. Then if you can jack that hip rafter back up where it should be and add a lot of strength underneath it you might get lucky. An impact driver and a lot of long construction lag bolts are your best tools.

dewgubbe

Posted 2/1/2017 17:20 (#5809829 - in reply to #5808822)
Subject: RE: Hip Roof repair help - sagging barn roof lean-to

Northeast Nebraska

Pics. Roof is actually 6/12 pitch.

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(IMG_0706.JPG)

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IMG_0704.JPG (141KB - 210 downloads)
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IMG_0703.JPG (153KB - 199 downloads)
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IMG_0705.JPG (109KB - 191 downloads)
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IMG_0706.JPG (120KB - 180 downloads)

dmax2001

Posted 2/1/2017 19:48 (#5810189 - in reply to #5809829)
Subject: RE: Hip Roof repair help - sagging barn roof lean-to

Lawton MI

Personally I don't think you're going to get them that much straighter, it's probably taking 100 years for them to bow that bad. I think I would peel the roof off and just tear all the framing apart and build new. For the hip rafters I would suggest a micro lam beam which is an inch and three quarters thick and made of plywood. Probably a 12" or 14" hip with 2x10 common rafters.

rollinsorchards

Posted 2/1/2017 22:12 (#5810604 - in reply to #5809829)
Subject: RE: Hip Roof repair help - sagging barn roof lean-to

Garland Maine

You could always just make it look good from the outside. Brace and support the sagging sections as is. Take off the tin roofing and top with purlins. Pad under the purlins with scraps, boards, plywood bits, whatever you need to make that level. Anchor the purlins securely at the jack rafters as they will help support them a little. Cover that with new metal roofing and it will look like a million bucks.

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