JLSE
Structural
- Oct 2, 2018
- 62
I am looking at using 24" stud spacing on a project... for the first time.... (its energy related... hehehe)
So I have been looking into the out of plane capacity of the sheathing... to make sure thats not an issue.
Typical details I adopted, show the plywood orientation installed vertically. This is generally a more cost effective way to build. But, it also makes it difficult to determine the minimum sheathing thickness. All span ratings I have found, are assuming strong axis bending.
And so, I am re-inventing the wheel... and looking at a few characteristics of the typical details I adopted:
It is my understanding, that running the plywood vertically can eliminate the horizontal joints, and/or lends itself to staggering the horizontal joints. Both of these things, increase the stiffness in plane. (I wouldnt be surprised, if it also increased shear... although I found no difference in the code.) Can anyone point to a good document on this? (any document on the increase in shear capacity would be good too)
It is also my understanding that Structural 1 Grade has increased cross bending performance, and better racking. Can anyone point to a good document on this? Something with substance (numbers even)... for instance; how that increased racking resistance increases capacity... or, does the increased cross bending capacity, increase weak axis span capacity?
But primarily, I am looking for a way to determine weak axis capacity.... so I can be sure that a 24" spaced supports wont exceed the deflection limits or the stress limits....
meanwhile, Ill be checking the studs...
So I have been looking into the out of plane capacity of the sheathing... to make sure thats not an issue.
Typical details I adopted, show the plywood orientation installed vertically. This is generally a more cost effective way to build. But, it also makes it difficult to determine the minimum sheathing thickness. All span ratings I have found, are assuming strong axis bending.
And so, I am re-inventing the wheel... and looking at a few characteristics of the typical details I adopted:
It is my understanding, that running the plywood vertically can eliminate the horizontal joints, and/or lends itself to staggering the horizontal joints. Both of these things, increase the stiffness in plane. (I wouldnt be surprised, if it also increased shear... although I found no difference in the code.) Can anyone point to a good document on this? (any document on the increase in shear capacity would be good too)
It is also my understanding that Structural 1 Grade has increased cross bending performance, and better racking. Can anyone point to a good document on this? Something with substance (numbers even)... for instance; how that increased racking resistance increases capacity... or, does the increased cross bending capacity, increase weak axis span capacity?
But primarily, I am looking for a way to determine weak axis capacity.... so I can be sure that a 24" spaced supports wont exceed the deflection limits or the stress limits....
meanwhile, Ill be checking the studs...