Discontinuous Sheathing at Rimboard

[medeek]

I've never had this specific request before so I thought I would put it out on the board to see what other opinions were:

The residence uses 14" deep I-Joists with 9'-1" stud walls. The designer/contractor does not want to have to install any mid-span blocking for panel splices (sheathing). They intend to use 4'x10' OSB sheathing, applied vertically. However if the sheathing is held to the top plate it ends at about midway on the 14" x 1-1/4" rim board. My typical detail does not allow for any splices in this region (I think the idea was to provide continuity/redundancy over the rimboard, bottom plate and lower half of the studs when I originally created it). Their idea is to then cut a small strip of sheathing to cover this bottom half of the rimboard. Provided they can get about 5" to 6" of sheathing lapping the rimboard I don't think I see a specific problem but I do need to give this some more thought.

A confused student is a good student.
Nathaniel P. Wilkerson, PE

http://www.medeek.com

 

[jayrod12]

It would be more like 10" lapping the rimboard if my math is correct. That would be fine by me, provided you aren't relying on the sheathing fastening directly to the nailer on the top of the foundation wall. And even then, I could likely be persuaded.

 

[NorthCivil]

what is the concern? appropriate shear transfer in wind/seismic?

you could double up or block the rim joist and nail through the top/bottom plates to connect the wall to the diaghram.

for overturning and some shear, you could use simpson MST straps to bridge the walls across the floor plate.

If you are still trying to use the sheathing to transfer into the rim joist, you could insist they use plywood. much better performance than OSB.

 

[KootK]

X3 for this not being a deal breaker. Obviously, where you need to transfer tension across the plenum, you'll need to do it some other way. As an example, modular built homes often lack the sheathing continuity described above. Also as an example, the same modular built home fly apart like Lego during hurricanes in the absence of a bunch of shiny connection hardware.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

 

[XR250]

As an example, modular built homes often lack the sheathing continuity described above

Most homes lack this (at least in our area)

 

[KootK]

Mine too.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.