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This is the classic Z-brace barn door look: a solid frame with a diagonal brace running corner to corner, backed with plywood so it reads as a solid slab from the front. The Z-brace isn't purely decorative — those angled pieces triangulate the frame and keep a door this size from racking into a parallelogram over years of sliding back and forth, which a plain rectangular frame would eventually do.
Measure your actual opening before cutting anything. A barn door needs to overlap the opening by several inches on both sides and the top so it fully covers the gap when closed, and that overlap comes straight out of your frame dimensions — there's no universal size here. Cut the two angled brace pieces last, holding them in place across the assembled frame and marking the angles directly off the real geometry, rather than trusting an angle number that assumes your frame came out exactly on paper.
| Item | Qty |
|---|---|
| 1x6 board, 4 ft | 1 each |
| 1x12 board, 4 ft | 1 each |
| 1x3 board, 8 ftStiles and the two angled Z-brace pieces. | 3 each |
| 1x2 board, 8 ft | 2 each |
| 1/2" exterior plywood, cut to door sizeBacks the frame so the door reads as a solid slab from the front. | 1 each |
| Sliding barn door track hardware kitBuy a kit rated for your door's actual weight and width — this is what makes it a barn door rather than a hinged one. | 1 each |
| Pocket-hole screws, 1-1/4" | 30 each |
| Wood glue | 4 oz |
Overall cost: $$$. Lumber prices vary by region, species, and season, so we give a band rather than a figure we would only be pretending to know.
| Part | Qty | T × W × L |
|---|---|---|
| Top and bottom rails1x6 | 2 | 3/4" × 5 1/2" × 21 1/2" |
| Mid rail1x12 | 1 | 3/4" × 11 1/4" × 21 1/2" |
| Stiles (sides)1x3 | 2 | 3/4" × 2 1/2" × 78" |
| Z-brace, long diagonal1x3Both ends cut at 25° off square, ends parallel to each other. Mark and cut off the assembled frame, not from this number alone. | 1 | 3/4" × 2 1/2" × 44 3/8" |
| Z-brace, short diagonals1x3One end at 40° off square, other end at 25° off square, cut in opposite directions. | 2 | 3/4" × 2 1/2" × 22 1/8" |
| Back frame rails1x2 | 2 | 3/4" × 1 1/2" × 78" |
| Back frame cross rail1x3 | 1 | 3/4" × 2 1/2" × 23 1/2" |
| Plywood back panel1/2" exterior plywood | 1 | 1/2" × 23 1/2" × 55" |
Buy 9 boards at 8 ft.
1 board
1 board
4 boards
2 boards
1 board
Assumes 8 ft stock, a 1/8" saw kerf, and buying each part at its own width. Change the board size or kerf on the full board plan →
Measure the actual width and height of your door opening, then size the finished door to overlap it by at least 2" on each side and the top so it fully covers the gap when closed. Adjust every rail and stile length in the cut list to match your real opening before cutting — the numbers here assume a specific opening and yours is almost certainly different.
Drill pocket holes in the ends of the top, mid, and bottom rails and join them to the two stiles with 1-1/4" pocket screws and glue, keeping everything square. This front-facing frame is what you'll see once the door is hung, so keep glue squeeze-out to a minimum on the front face.
Hold the long diagonal brace across the assembled frame corner to corner and mark the actual angles directly off the frame, rather than trusting the reference angle alone — your real frame's exact width and height determine the true angle. Cut and fit it, then do the same for the two shorter diagonals that complete the Z. Pocket-screw and glue all three in place.
Screw the two back frame rails and the cross rail to the back face of the door, then attach the plywood panel over them with glue and screws driven from the back only, so nothing shows on the front. This is what gives the door its solid-slab look from the room side.
Sand every edge and both faces, finish as you like, then mount the track hardware to your wall header per the kit's instructions and hang the door. Check it slides smoothly and hangs plumb before calling it done — most sliding-door binding issues trace back to the header not being level.
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