We used rough-sawn cedar 1-by-8s to make the 79-inch-tall barn doors. Each door requires four full-width 1-by-8s plus one ripped down, so the combined width equals 35 3/4 inches. Boards are held together with a Z-shaped frame made of 1-by-4s ripped from remaining 1-by-8s. Attach frame boards with 13/8-inch deck screws.
Seal doors with stain or clear wood preservative. Add strap hinges so screws run through horizontal frame members and into door boards: Place doors in opening, resting them on plywood scraps (for clearance), and screw hinges to front of posts. Check swing; add handles, hasp.