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Every bonus room with sloped ceilings has the same triangle of dead space behind the knee wall — and the standard little access hatch wastes almost all of it. This build replaces the wall itself with a row of full-width plywood doors on concealed Euro hinges, styled as board-and-batten paneling. Closed, it reads as a plain trimmed wall. Open, the entire triangle is storage.
The carpentry is a stub wall: plates and studs (45" studs, one every 32" and at the ends), built flat on the floor, tipped up, and screwed to floor, side walls, and ceiling framing. The line the source underlines is the one to obey: THE OPENINGS MUST BE SQUARE. Concealed hinges have a few millimeters of adjustment, not a few degrees — a racked opening means doors that bind at one corner and gap at the other, forever. Square the wall on the floor, and check it again after fastening, because screwing to an out-of-level floor can rack a square wall.
The 2x4 top trim and 2x2 bottom trim aren't decoration — they stand the wall face proud so the doors have clearance to swing past the floor and the sloped ceiling. The door math handles overlay: each plywood door is cut 1-1/4" wider than its inside opening (5/8" overlay per side, matching the 5/8" overlay concealed hinges) and 1/2" shorter than the overall height.
The 1x3 battens do three jobs at once: door handle (mounted on the non-hinge edge), gap-hider between doors, and the visual rhythm that sells the paneling disguise. Position each so it doesn't block the neighboring door's swing. And steal the source's honest shortcut: openings too narrow to be useful just get their plywood nailed on fixed — a fake door costs nothing and keeps the rhythm.
| Item | Qty |
|---|---|
| 2x4, 8 ftPlates, studs, and top trim for an 8-ft wall. Scale to your run. | 5 each |
| 2x2, 8 ftBottom trim — stands the wall face proud for door swing. | 1 each |
| Finish trim, 8 ftCovers the top gap against the sloped ceiling. | 1 each |
| Hardwood plywood, 3/4", 4x8 sheet, cabinet gradeThe doors. Cabinet grade — these faces ARE the wall. | 1 each |
| Concealed Euro hinges, 5/8" overlayTwo per operating door. Full-overlay frameless hinges work with the same math. | 6 each |
| 1x3, 8 ftBatten handles. | 2 each |
| Self-tapping screws, 2-1/2", star drive | 50 each |
| Brad nails, 1-1/4" | 60 each |
| PaintOne color across doors, battens, and trim — uniformity is the disguise. | 1 qt |
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 |
|---|---|---|
| Plates and top trim2x4Cut to YOUR wall length — 96" shown for an 8-ft run. | 3 | 1 1/2" × 3 1/2" × 96" |
| Studs2x4Every 32" and at both ends. Count depends on your run. | 4 | 1 1/2" × 3 1/2" × 45" |
| Bottom trim2x2Cut to wall length. | 1 | 1 1/2" × 1 1/2" × 96" |
| Doors3/4" plywoodFORMULA, not gospel: inside opening width + 1-1/4", overall height − 1/2". 30 x 44 fits the example 8-ft wall's ~28-3/4" openings. | 3 | 3/4" × 30" × 44" |
| Batten handles1x3Cut to match door height. | 3 | 3/4" × 2 1/2" × 44" |
Some parts are longer than a 8 ft board, so there is no honest board count to show here. Open the board plan to pick a longer stock length — it names every part that does not fit.
2 boards
0 boards
2 boards
2 boards
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 →
Build the stub wall on the floor: top and bottom plates the length of the run, 45" studs at both ends and every 32". Screw with the 2-1/2" screws, and square the openings by matching diagonals — write this on your hand: THE OPENINGS MUST BE SQUARE, because concealed hinges adjust millimeters, not degrees.
Tip it up, plumb it with the level, and fasten to the floor, side walls, and (via blocking if needed) the ceiling framing — into studs and joists, not drywall. Re-check the opening diagonals after fastening; an out-of-flat floor can rack a square wall as you screw it down.
Run the 2x4 across the top and the 2x2 along the bottom with the screws. These bring the wall face proud of the framing so the doors can swing without scraping floor or slope — they're clearance spacers dressed as trim. The small gap remaining at the top gets covered by finish trim at the end.
Measure each opening (measure each — framing reality beats plan dimensions), and cut each plywood door 1-1/4" wider than its inside opening and 1/2" short of the overall height. Cut with a straightedge guide; these edges are on display.
Install the concealed hinges per their template — drill the 35mm cups if yours are cup hinges — and hang each door, then walk the adjustment screws until margins are even. For any end opening too small to be a useful door: nail the plywood on fixed, as the source did. It keeps the rhythm and costs nothing.
Cut the 1x3 battens to door height and brad-nail one to each door's NON-hinge edge. Each batten is the door's handle and hides the gap to its neighbor — dry-swing each door before nailing to confirm the batten doesn't block the adjacent door's arc.
Nail the finish trim over the top gap, fill, sand, and paint everything one uniform color. The moment the paint dries, the doors disappear — which was the point.
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