How do I cut a laminate worktop without chipping it?
Cutting from the right face, sealing the exposed core, and the tape-score-support routine that keeps the laminate edge crisp.
- Difficulty
- intermediate
- Time
- 45 min
- Read
- 4 min
- Safety
- caution
Short answer
Cut from the underside with a circular saw, or from the top with a downcut jigsaw blade. Tape and score the line first, support the whole length on both sides of the cut, and seal the raw chipboard edge afterwards — an unsealed worktop edge next to a sink will swell within months.
A worktop is a chipboard core with a thin laminate face and a moulded front edge. The laminate chips very readily and the core soaks up water, so the two things that matter are how the blade exits the laminate and what happens to the edge afterwards.
Safety
What you'll need
- circular saw or jigsaw with downcut blade
- fine blade, 60 tooth or more
- masking tape and a sharp knife
- straightedge and clamps
- PVA or silicone for edge sealing
- laminate edging strip (optional)
Step by step
- Measure and mark on the face you will cut from.If you are cutting from the underside with a circular saw, the mark goes on the underside, and remember the piece is now mirrored. Double-check which end you are removing.
- Decide the direction of the cut.A circular saw's teeth exit the top, so cut with the laminate face down. A jigsaw with a downcut blade exits the bottom, so cut with the laminate face up. Choose one and be consistent.
- Tape along the line on the laminate face.Two overlapping strips of decorators' tape, and mark the line on the tape. It supports the laminate and prevents the baseplate scratching the surface.
- Score the line through the laminate.A sharp knife or a laminate scorer along a straightedge, cutting just through the laminate layer. This is what gives a crisp edge instead of a chipped one.
- Support the whole worktop on both sides.Trestles and battens under the keeper and under the offcut. The offcut must not be able to drop as the cut completes.
- Clamp a straightedge and cut in one pass.Stopping and restarting leaves a step. Set the depth about 5mm past the material, run steadily, and keep the saw hard against the guide.
- Cut on the waste side of the line.The blade removes 2 to 3mm of material. Leave the line on the piece you are keeping.
- Ease the cut edge.A very light pass with a fine sanding block along the arris removes the sharp edge and any tiny chips.
- Seal the cut edge.This is not optional. Neat PVA, a proprietary worktop sealer or silicone brushed into the raw chipboard, especially the edge that will be near a sink or a dishwasher.
- Finish the edge visibly.Iron-on laminate edging strip, a matching trim, or a joint strip if it butts to another top. Trim the edging flush with a sharp block plane or a file working downwards.
Tips
- Score through the laminate with a knife before cutting. It is the single technique that separates a clean edge from a chipped one.
- Seal the raw chipboard edge on the day you cut it. An exposed edge near a sink swells irreversibly and the laminate lifts.
- Cut a scrap piece first if you have one — worktop laminates vary a lot in how brittle they are.
Common mistakes
- Leaving the cut edge unsealed — Chipboard core wicks water enthusiastically. Around a sink or a dishwasher, an unsealed edge swells, lifts the laminate and cannot be repaired.
- Cutting with the laminate face towards the blade exit — The teeth lever the brittle laminate upwards as they leave, chipping it along the full length of the cut.
If it doesn't work
Laminate chipped along the cut
Cause: Wrong face orientation, coarse blade, or no scoring — Fix: Chips near the edge can be hidden under an edging strip or a trim. Next time score the line and cut from the correct face.
Cut wandered off the line
Cause: Straightedge not clamped, or saw not held against it — Fix: Clamp the guide at both ends and keep constant sideways pressure. Small errors can sometimes be trimmed with a router and a straightedge.
Blade bound and kicked back
Cause: Offcut unsupported and pinching the kerf — Fix: Support both sides of the cut fully before starting. Never let the offcut hang.
Edge swollen after a few months
Cause: Unsealed edge in a wet area — Fix: The swelling is not reversible. Cut back to sound material if possible, reseal thoroughly, and consider a joint strip.
Questions people ask
Can I cut a worktop with a jigsaw?
Yes, with a downcut blade, a clamped guide and patience. It is slower and more prone to wandering than a circular saw, but for a short cut in an awkward position it is often the practical choice.
How do I cut the hole for a sink?
Mark from the template supplied, drill starter holes inside the waste, and cut with a jigsaw using a fine blade. Tape the line, support the cut-out so it cannot drop, and seal every raw edge afterwards.
What about solid wood or composite worktops?
Solid wood cuts like timber and needs oiling rather than sealing. Composite and stone are specialist — dust, weight and blade type all change, and they are usually best cut by the supplier.