I bought a dozen 2x12 x 8ft boards at the local big box store. Geez talk about mediocre wood. Most were pretty damp and I am hoping it was because they got rained on.
I "borrowed" the lath strips that got exposed as I picked through the pile. I have eight strips that run almost the full width and laid those down on the garage floor - a bit over a foot apart.
I'm thinking I will sacrifice some free yard sticks and add those to the pile.