jay wrote:...if you are fortunate enough to find a local [read: privately owned] lumberyard..."
Scott,
My sympathies on your problems with finding ACX.
At first, I was doubtful about your report that your Home Dept didn't sell it, but when I went shopping myself at HD and Lowes, my experience echoed yours. *If* they carried it, they did so only in a limited range of sizes, at very high prices, and the product was mushy, 3-ply junk. ( I might as well be building with cardboard.)
So I stopped by a little independent yard, Shur-way on N. Portland Road, where I've occasionally bought the same materials for less the the big box stores.
Bingo!
They had 1/8" Luan. They had 1/4" Luan. They had gorgious 3/8" Birch, Cherry, Hickory, Maple, Oak, and Walnut for $20-25/sheet. (The Hickory was 5-ply, stiff as steel, and I grabbed a sheet for the innner face of my deck.)
But the killer deal was 3/8", 5-ply occume with an exterior glue for $20/ sheet. That's cheaper than fir, and a better product to boot. (That becomes the weatherside of my deck sandwich.)
My conclusion? Even if you can find ACX fir, you probably wouldn't want to use it for its being flimsy, void-filled junk. Somebody out there is manufacturing better plywoods than the big box stores sell, and the prices aren't outrageous. But the hassle is finding a local supplier.
Charlie
There are 3 ways of doing work, but you can only have 2 of them at the same time:
FAST and GOOD isn't CHEAP. CHEAP and FAST isn't GOOD. CHEAP and GOOD isn't FAST.