||08-05-2008 10:40 PM
Unless your project's engineered plan says otherwise, you're only required to anchor the first bottom plate. So, just bore holes in the 2nd plate just wide enough to provide visual access to the nut and washer. I'm assuming you're anchoring the bottom plate, then tilting the wall with the 2nd plate on top of it. If not, just use a socket to get at the nut.
One thing to remember here. The bottom plate is the anchored plate, and therefore your sheathing must be fastened to it. I often see this done just like you're doing it, but people fail to tie the wall to that bottom plate by nailing the sheathing off. Inevitably, the sheathing is nailed to the upper bottom plate, which doesn't tie that wall down.
If for some reason you're required to have two plates (some wind load designs mandate it in some cases), I'd suggest getting some Simpson epoxy and drilling in threaded rod after the fact.