Okay, time to thicken the next wall. I think I can paint a clearer picture of how this process works this time, now that I (ahem) kind of know what I'm doing, in stark contrast to the first two walls.
Here's my starting point: this wall used to be a tilt-up garage door, and it's been filled, stucco'd on the outside, and I've put Roxul between the studs on the inside.
Next up, I lay out the first line for the top of the inset Wiremold channel. This line is referenced from the channel on the other side of the room to keep things perfectly straight.
This spot will be a complex intersection -- the Wiremold will transition from horizontal to vertical via a "T" fitting, and a piece of strut channel running just below the Wiremold will do an "L" down toward the floor. I'll need to put some blocking here, but the Roxul doesn't compress very well:
Fortunately, it carves
really well. Much better than fiberglass:
Blocking in place:
More layout lines, this one for the edge of the vertical Wiremold channel:
No, seriously. I could not do this task without my laser level. It is very much indispensable. I can almost always find some convenient piece of metal to stick it to. If not, I set up the tripod.
First furring strips go up:
More layout lines, this one for the lower horizontal furring strips. I run the furring strips horizontally for the portion of the wall that lies below the Wiremold channel, which gives better thermal and acoustic (but mostly thermal) performance.
Here's some detail on that complex intersection that I installed blocking for:
And finally, the finished structure of the wall is complete. The furring strips are run vertically on the upper portion of the wall to make it easier to hang cabinets and such later on down the road. Most mounting systems rely on vertical studs, and I don't have enough foresight to install horizontal blocking in the right spot for cabinets I haven't even picked out yet. I lose a little bit of R value this way (wood has an R value of 1 per inch) but so be it.
Next up:
days and days of shimming the furring strips to get the right reveal on the Wiremold channel. Fun!