Racked carcasses, stripped confirmat screws, doors that won't close — most self-assembly problems are predictable and easy to avoid.
Carcass Assembly Mistakes
- Tightening confirmat screws fully before the back panel is in — the carcass racks. Rule: assemble loosely, fit the back panel, check the diagonals, then tighten
- Not inserting dowels before joining panels — parts shift, then you have to disassemble
- Fitting a side panel face-in instead of face-out — both sides look identical but the fixing holes are only on one side
- Hitting a confirmat with a hammer — strips the head. Use a drill-driver with a Torx or hex bit only
- Assembling the carcass while it is standing upright — it will not be square. Work on the floor or a bench
Fixing Mistakes
- Confirmat screw driven through both panels — the joint is destroyed. Screw length must match board thickness: 50 mm for 16 mm board
- Screw driven in at an angle — panels pull apart. Start perfectly perpendicular to the edge
- Over-tightened eccentric cam — threads strip in the board. Tighten only until the cam clicks into position, no further
- Wrong fixing type — a wood screw used where a confirmat is needed, or vice versa
- Dry-fitting dowels without glue — unloaded dowels are fine, but they fall out when the piece is moved
Back Panel Mistakes
- Not checking diagonals before nailing the back panel — the rack is locked in permanently
- Back panel slid into the groove but not nailed — it slides out under load
- Nailed only at the perimeter, missing intermediate points — the panel bows in the middle
- Wrong grain direction on the back panel — some models specify vertical grain
Diagonal check: measure corner to corner with a tape measure. A difference of more than 3 mm means the carcass is racked. Fix it by nudging one side panel before tightening the confirmat screws.
Door Hanging Mistakes
- Hinge cup drilled in the wrong hole — the door won't close or fouls the adjacent one. Cup position is always as stated in the instruction: typically 3–5 mm from the edge
- Skipping hinge adjustment after hanging — doors sit crooked. Every hinge adjusts on three axes: in/out, left/right, up/down
- Over-tightening the hinge plate to the carcass — the melamine board begins to crumble. Tighten to firm resistance, not until something cracks
- Hanging a tall or heavy door on two hinges instead of three — it will sag within months. Doors taller than 1200 mm or heavier than 8 kg need at least three hinges
- Leaving the protective film on the hinge before hanging — it prevents a flush fit
Drawer Installation Mistakes
- Runners not installed parallel — drawer sticks or skews
- Runners at different heights on each side — drawer tilts when open
- Rear runner clip not engaged — drawer pulls away from the back when opened
- Drawer front screwed on without alignment first — gaps are uneven. Fit loosely, align by eye, then tighten
Wall Mounting Mistakes
- No level line marked — cabinets hang at different heights, bottom edges don't line up
- Wrong wall plug for the wall type — holds less or not at all
- Drilling without a cable detector — hitting a live wire or pipe
- Hole not blown out before inserting plug — dust stops the plug expanding
- Cabinet hung on two screws instead of four — each screw carries twice the designed load
Worktop Mistakes
- Cut edges left unsealed — moisture enters the chipboard core and the edge swells. Apply silicone or edge sealant immediately after cutting
- Sink cut-out left unsealed — the same problem, but in the highest-moisture zone in the kitchen
- Worktop joint assembled without metal draw-bolts — it will open over time. Minimum two bolts per joint
- No silicone bead under the sink before fitting — water runs into the gap between sink and worktop
Mistakes That Are Hard to Fix Later
- Carcass screwed to wall and floor without checking level — impossible to correct without a full strip-out
- Confirmat screw driven until threads strip in the board — hole is ruined; needs an insert or a new panel
- Back panel nailed into a racked carcass — cannot be squared without disassembly
- Worktop sealed down with silicone with no way to lift it — if there's a leak under the sink, the pipes are inaccessible
The core rule of self-assembly: verify each stage before moving to the next. A racked carcass produces misaligned doors which produce drawers that won't run true. Fixing problems at the end is far harder than catching them at the start.