AVS Special Member
Join Date: Sep 2007
Location: Give a monkey a brain...
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Ah, I see the predicament.
Are you sure the bottom plate is exactly over the double joist? You could drill some tiny holes in the plywood floor, next to the bottom plate. Pass a small gauge conductor (e.g. stripped 22 AWG) through the drilled holes, to help find them from below. I use some colored wire (jewelry making wire from an arts and craft store) for this, to help find it.
I don't know what your stairway looks like, but you could use some rigid or flex PVC conduit to help protect the cables in the stud bay, if there is some foot traffic nearby. Covering the open stud bay, near the bottom, with a large metal plate, may also do the trick. These are sold at HD/Lowes, and are used to protect pipes from nails (kind of like a large nail plate). They're usually near the Sampson tie plates, if you can find those at HD/Lowes.
If the bottom plate is directly over the double joists, I'd do a couple angled cable holes, trying to avoid the double joist as much as possible. Not a big issue, IMHO.
Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense. -Buddha
Give a monkey a brain and he'll swear he's the center of the universe. -Fishbone