Gable end framing -- hinge effect?

Started by rothbard, July 23, 2024, 08:03:47 AM

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rothbard





I looked back through this forum and didn't find any examples of the 1 story 20x30 being built with balloon framed gable ends.

I was wondering if maybe others had found some way to mitigate the hinge effect as seen above when wind force acts upon a platform framed end?

the 20x30 single story design has an open beam ceiling.  This doesn't leave a diaphragm or support I can think of to stop the above hinge effect at the gable end other than staggering the sheathing.

Curious if I had missed something?  The plans don't call out baloon length studs here either.  I looked for any details providing hinge support.  I'm going to plan on just baloon framing the 2x6 gable end all the way to the roof I guess since those ends aren't "load bearing" as the roof is steep enough at 10:12 that the ridge board has essentially no downward force.

I found this particular video of the same consideration for a similar design


rothbard

Thought about this some more.  Approach looks like it can be split per publication I found that suggest ceiling diaphragm only needs to go 40% of width down the length of the building to brace the hinge.  Therefore rear gable will be platformed and front will be balloon framed.

I know no one probably cares, but if years and years from now someone else is building the single story 20x30, take note to consider altering the plans to platform frame the rear wall, braced by the attic diaphragm.  And then to frame the front cathedral gable end with balloon/rake wall from top to bottom.  

Note: not engineering advice


Don_P

R602.3  Studs shall be continuous from support at the sole plate to a support at the top plate to resist loads perpendicular to the wall. The support shall be a foundation or floor, ceiling or roof diaphragm or shall be designed in accordance with accepted engineering practice.

That whole section is worth studying  ;)