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Topic: Hip Roof

garagedweller88

Mon, 12/18/2006 - 12:01pm

Hip Roof

I am trying to figure out the correct way to support the hip roof on my garage,The support beam in one of the corners is starting to bow .Can someone give me some tips. Thanks

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Which beam is bowing - the

jeffe_verde writes:

Fri, 12/22/2006 - 7:56am

Which beam is bowing - the hip rafter (runs from corner of the wall up to the ridge), the ridge, jack rafters (wall to hip rafter), or...? Also, does the garage have either ceiling joists or collar ties tying the walls together? Roof sag is usually caused by the walls spreading. In a garage, you'll often find that someone has removed joists/collar ties to make room for overhead storage. If it's not corrected, the thrust load from the roof will eventually cause the walls to fall over and the roof to collapse.

hip roof

garagedweller88 writes:

Fri, 12/22/2006 - 1:55pm

The hip rafter is bowing, also there are no collar ties or ceiling joists. The walls are starting to spread about an inch only in the very center on top. is there any tips you could give me. I was thinking about making a wall in the middle of the garage and running supports all the way up to the jack rafters,(a weight bearing wall)Then tying that in to the opposite walls with 2 by 4s. do I need to jack up the center and pull in the walls, or can I just support it as is to keep the walls from spreading any further. I dont have tons of money to invest in this project( about $200- $300 ) but I need to make it stable.As for the bow in the hip rafter I know I will have to jack that up to its original state. Any imput or ideas would be great. Thanks so much.

If the roof has a ridgeline,

jeffe_verde writes:

Sat, 12/23/2006 - 4:02pm

If the roof has a ridgeline, there MUST be something, whether collar ties or joists, connecting the two walls running parallel to the ridge. Otherwise the lateral thrust load will push the walls apart and the roof will fall in. A square hip roof, where the hips meet at a peak and there is no ridge, doesn't require ties as the sheathing holds the hips together.

I'm not sure what would cause only the hip rafter to sag, other than a weak/damaged timber (termites, dry rot, cracked, etc). Can you post a picture?

I suspect you've got a bigger problem. But if it is just a bad rafter, the fix is to peel back the roofing, remove the hip jacks, replace the hip rafter (be sure to match the top cut - it's a double compound miter), replace the jacks and replace the roofing. If you're careful, you can re-use everything but the bad hip rafter.

Here's a page that describes the loads in a roof structure. See the section at the bottom that shows a failed hip roof-
http://www.unified-eng.com/ch/thrust.html

Just to clarify - the ties

jeffe_verde writes:

Sat, 12/23/2006 - 4:05pm

Just to clarify - the ties connect the two WALLS which run parallel to the ridge. The ties themselves run perpendicular to the ridge.