I should change the name of my theater to, "Theater of Mysteries" 'cause here's another one. (The short version, I have some 25 ga that's thinner, but I also have some much stiffer stuff that's marked the correct size for 25 ga, you can skip to the last paragraph if you don't want the details
Last night I started trying to figure out this business with my hat channel. I was planning to weigh a stack of them, but when I started sorting them I discovered I had another distinctly different type of channel at the bottom of each stack. Here's a picture of the two types
On the left, the stuff I found last night, is much lighter than the stuff on the right, and it's much easier to work with. The stuff on the right is the what I've been using so far, and requires two hands, some grunting, and a fair amount of sweat to get it into the clips. I shot Ted an email this morning, and from what he can see, he thinks the stuff on the right is 22 ga.
OK, sounds right, EXCEPT, I picked up one of those cheap digital calipers from Lowes, and measured several sticks. The stuff on the left is pretty consistently at 0.021-0.024", and 0.026-0.028". I'd guess about .005" difference on average. I also found a sticker and a hand written note on one stick of the thicker stuff claiming it's 0.018", which would be right for 25 ga. hat channel.
Oh well. I used the heavier stuff on the ceiling, and I HOPE I have enough of the lighter stuff for the walls. I'm planning to call the drywall company tomorrow and see what they can do. If they can actually find enough of the 25 ga, I may replace the stuff on the ceiling. If not, well, it actually makes me feel a little better with the heavier gauge stuff on the ceiling. I've seen a few references online that recommend 22 ga on the ceiling and 25 ga for the walls. I know there will be a loss in performance, but I wonder if it would be audible.