14:12 Hip Roof

[XR250]

I have a 22' x 44' rectangular hip roof (not vaulted). The rafter pitch is 14:12. I generally try to support the peak of the hips but, I mean in this case, do I really need to? I am considering just doubling up the rafter and ceiling joists that support the hips but, realistically, is that even necessary?
This is not a high snow area (central NC USA). Also, using a metal roof.

 

[KootK]

To clarify some things:

1) This is stick framing rather than trusses, correct?

2) Is your fundamental argument that, the steeper the roof, the greater the ability to rely upon the diaphragm to resist gravity loads?

 

[XR250]

yes and yes and folded plate action etc.
Actually, just was informed they are sheathing the attic floor with plywood so I will use that to resist the thrust.

 

[kipfoot]

To me, your thinking is valid. The steeper pitch results in a smaller horizontal thrust at the base, so you may not be asking too much from your materials and fasteners. At the eave of the short side you might want blocking and straps to help you resolve the horizontal reaction at the attic floor.

You could also think about designing for the truss action in the rafters and ceiling tie at the end of the ridge so that the members in this vertical plane would carry the hips as beams.

 

[XR250]

You could also think about designing for the truss action in the rafters and ceiling tie at the end of the ridge so that the members in this vertical plane would carry the hips as beams.

My thoughts exactly.....

"I am considering just doubling up the rafter and ceiling joists that support the hips"

 

[kipfoot]

My thoughts exactly..

yeah, sorry about my poor reading comprehension. My answer is 'no,' you don't need it if you can resolve the bottom-of-rafter thrust at the short end of the building. At this pitch it might be on the order of 100 lb/ft.