Diaphragm to Shear Wall Load path

[PRESIDENTJ]

I have a light gauge structure that I am transferring roof diaphragm to the shear walls at the eaves and rakes. Both the eave and rake have a parapet situation. The eaves need an internal gutter. What's the best way to get my roof diaphragm to the light-gauge shear walls? Also, should I place a box header between each stud at the roof line?

I have included a snippet of my condition.

 

[XR250]

I don't even know where to start.

 

[XR250]

Ok, maybe integrate the parapet into the truss profile. Then use slightly diagonal blocking panels (to clear the gutter) to transfer the shear from the roof sheathing to the top of the wall.

 

[PRESIDENTJ]

I don't even no where to start.

Ok, maybe integrate the parapet into the truss profile. Then use slightly diagonal blocking panels (to clear the gutter) to transfer the shear from the roof sheathing to the top of the wall.

That's been thought of, but where would the internal gutter be located?

 

[TRAK.Structural]

Can you put a bent plate on the top chord that extends to the wall and make the connection to transfer diaphragm shear? Plate could be discontinuous so that the top of the gutter wont be totally covered. This may create more complexities with the diaphragm design and maybe require some misc. steel to get all the load from the diaphragm to the sections of bent plate.

 

[XR250]

Something like this....

 

[jayrod12]

What about eliminating the internal gutter in lieu of a couple discrete roof drains. That should allow your roof diaphragm to be relatively continuous to the light gauge wall.

 

[RPGs]

Can you overframe a little cricket and pitch break on sleepers so the integral gutter is above the truss/sheathing?

 

[PRESIDENTJ]

Can you overframe a little cricket and pitch break on sleepers so the integral gutter is above the truss/sheathing?

View attachment 1889

I actually like this idea!! Thank you.

 

[PRESIDENTJ]

What about eliminating the internal gutter in lieu of a couple discrete roof drains. That should allow your roof diaphragm to be relatively continuous to the light gauge wall.

And use crickets?

 

[PRESIDENTJ]

Something like this....

View attachment 1883View attachment 1883

Thank you for this idea! Angled blocking. Genius. Correct me if I am wrong, but the wood sheathing will be taking most, if not all, the shear load to the eaves - so yes, I have enough shear capacity in the screws through OSB into the top chord of the trusses. I have specified 14 ga. furring channel on top of the trusses so the metal roof panel has enough pull-out strength (they're 2' o/c max spacing).

 

[jayrod12]

And use crickets?

Correct, crickets in between the roof drains.

All I know from my experience is internal gutter systems are highly prone to leaking and making owners angry.

 

[XR250]

Thank you for this idea! Angled blocking. Genius. Correct me if I am wrong, but the wood sheathing will be taking most, if not all, the shear load to the eaves - so yes, I have enough shear capacity in the screws through OSB into the top chord of the trusses. I have specified 14 ga. furring channel on top of the trusses so the metal roof panel has enough pull-out strength (they're 2' o/c max spacing).

Did not know you had wood sheathing. Must be pretty high wind loads to need 14ga purlins.