March 23, 2016
The rim is just toe nailed to the sole plate, the floor joist are required to be nailed into the sole that is bolted per code. Blocking up 4 plates tall is not addressed far as i know in the code other than at the garage portal walls. This question has been asked also in our area. blocking i wouldn't consider the same as a cripple stud wall. i haven't read the commentary on this section but rolling of the plates and or short cripple studs would be the reason for soling blocking the short walls at 14" or under. we see this in different levels of a floor and we sheath one side with 3/4" plywood or solid block to prevent rotation.
May 24, 2015
Where did you get your definition of solid blocking? I am having a similar issue.
December 31, 1969
R602.9 describes cripple walls of various heights. The commentary elaborates slightly more putting a lower limit on stud lengths of 14". Then one must use solid blocking.
If I choose to build up my 2x6 sill plate (that has been anchored per R403.1.6) with 3 additional 2x6's, why would this not be allowed? It should be considered a cripple wall with solid blocking and treated as such. These are certainly not sill plates in that they do not need to be treated. What purpose does it serve to require these to be bolted with anchor bolts when the rim joist above is secured with nothing but 8d toenails every 6"?
Note that this is under the 2012 IRC and seismic zone A.
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