Diaphram action in stick-frame construction without roof sheathing

[HeavyCivil]

Title says it all - any suggestions on getting forces from windward walls into perpendicular shear walls without roof sheathing? Building in question is quite modest - 16x24 single story.

 

[JAE]

Simpson has some types of straps that could be fashioned in diagonal layouts.

 

[MiketheEngineer]

You might be able to add top plate sills that act as a beam and will transfer the forces??

But the straps are easy and cheap

 

[ToadJones]

With roof trusses or rafters, you can add diagonal bottom chord bracing (2x4's) to take the forces out to the perpendicular shear walls. On a building that small it should be a cakewalk.

 

[ToadJones]

matter of fact, most builders will add this type of bracing on the bottom chords of trusses whether it is called for or not. Some call it "W" bracing. It sometimes looks like a series of "W"'s running from the walls back to a "rat run" running down the center of the building perpendicular to the trusses on the bottom chord. It is often used to brace gable end walls with gable trusses also.

 

[HeavyCivil]

Thanks a lot.

also notices i spelling DIAPHRAGM wrong in the title

 

[HeavyCivil]

Noticed*, Spelled*.... I am from America I swear. I need to start clicking 'Preview Post'

 

[slickdeals]

**also noticed I spelled .....??
Did you notice or do you want us to notice?

 

[msquared48]

You could also use any ceiling sheetrock (if there) as the structural diaphragm, although I cringe at the thought.

Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask

 

[MiketheEngineer]

Drywall - Supposedly can be good up to about 150 plf if I remember and installed correctly.

 

[HeavyCivil]

I'm using sheetrock for the interior walls. Will leave collar ties bare so I can throw stuff up there. If you didn't already guess this is a personal project.

I'm planning on putting 3' wide full height panels (1/2" osb nailed to high holy) on either side of a 10' OH door, and a panel at each corner (run with strong axis the wrong way). Then fur-out unsheathed portions for barn board.

Running the numbers I actually don't even need sheathing anywhere but in each side of the overhead door if I'm sheetrocking, but it'll allow me to procrastinate in hanging the rock without worrying about a strong breeze toppling it.