Hip Roof Load Bearing

I recently acquired a calculation where such a point load was deemed to be 12 000 lbs on a 28 wide garage having a 10 12 pitch roof. In hip roof designs all four exterior walls support the ends of roof rafters so all exterior walls bear a weight load from the roof above them. Anything 5 and above we always at least double cripple.

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Not all exterior walls are bearing walls though.

Hip roof load bearing.

Because i have a hip roof that slopes towards each exterior wall each of those walls is carrying some roof weight. The exterior walls on houses that support the roof are primary bearing walls. A bearing wall will run in the same direction as the ridge of your roof. These walls directly support roof trusses or rafters.

Some claim true rectangular or square hip roof structures are self supporting. As the foundation block walls yellow on layout run perpendicular to the demo wall red arrow indication on layout we figured it s probably a non load bearing wall. Any wall on all floors directly above or parallel to a basement beam typically wood steel i beam or a basement wall must be considered by a layman as directly load bearing. The forces on the hip rafter jack rafter connection consist of the tributary roof load transfered by the jack rafter plus a force along the axis of the jack rafter which also changes the perspective of the stresses at the bottom of the jacks from straight down to sliding off the plate.

The exception would be in the case of a hip roof were ceiling joists often change direction at each end of the house and a wall is run crossways to support the inside ends of the joist the ceiling joists appear to change direction directly above one of the walls. There are many houses where just the front and back walls are bearing walls. Bearing according to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2. Interior load bearing walls may also support the roof as they do in gable roof designs.

Side walls are primary load bearing walls in simple gable end framing but hip roofs and complex roof lines depend on more than just the side. My home is different. We want to open the small kitchen into the old unused dining room in our single story hip roof house. Stair well openings are also typically load bearing points.

However a house with a hip roof structure suggests that all the exterior walls are bearing walls.