Which blade cuts plasterboard?
Which blade cuts plasterboard?
A utility knife for straight cuts and a jab saw or multi-tool for cutouts — a circular saw is the wrong tool entirely.
Plasterboard cuts by scoring the paper facing on one side, snapping the gypsum core along the score and then cutting the back paper — the core is weak and does the breaking for you, which is why a knife outperforms any saw for straight cuts and generates almost no dust. Cutouts are the risky part of the job: cables run in defined zones above and below sockets and switches, but old wiring and plumbing do not always respect them, so a blind plunge with a jab saw is the classic way to cut a live cable. A detector and a shallow depth setting cost nothing. Sawing plasterboard with a circular saw fills the room with gypsum dust for no gain at all.
The options, ranked
| Option | Good at | Bad at |
|---|---|---|
| Utility knife, score and snap | Almost no dust, fast, accurate against a straightedge, and it is how the trade cuts sheets. | Straight cuts only, and it needs a fresh blade to cut the paper cleanly. |
| Jab saw (pad saw) | Plunges straight into the board for socket and downlight cutouts with no setup. | Blind cutting: you cannot see cables or pipes behind the board. |
| Oscillating multi-tool | Controlled plunge cuts with a shallow depth setting, much safer against hidden services. | Slower, and it makes more dust than a knife. |
| Router with a drywall bit | Fast and accurate around back boxes and downlights on a large job. | Throws a great deal of gypsum dust, and needs the fitting already installed to follow. |
Technique that changes the outcome
- Score once firmly through the paper, snap the board back over the line, then cut the rear paper
- Use a fresh knife blade — a blunt one tears the paper rather than cutting it
- Check for cables and pipes before any plunge cut
- Set an oscillating tool to just past board thickness so the blade cannot reach a cable
What goes wrong
- Blind plunge cuts near sockets, switches and consumer units
- A circular saw, which produces enormous dust for no benefit
- Cutting a board resting on the floor edge-on; support it flat or vertically against a wall
Compiled practical guidance rather than a published standard. Product formulations vary by brand and market, so read the label — and where the work is structural, electrical or gas, the regulations that apply where you are govern rather than anything here.
Other blade questions
| For | Use |
|---|---|
| Metal | A bi-metal or carbide-tooth blade with at least three teeth in the cut — that tooth-count rule matters more than the machine. |
| Tile | A continuous-rim diamond blade with water — and cut wet, because dry cutting tile produces respirable silica dust. |
| Wood | 24 teeth for ripping and framing, 40 for general work, 60-80 for a clean crosscut finish. |
| Plywood without tearout | A sharp 60-80 tooth blade, a scoring pass, tape on the line, and the good face oriented for the tool you are using. |
| Brick | A segmented-rim diamond blade, cut wet or with on-tool extraction — brick and mortar dust is a serious silica hazard. |
| Laminate | A triple-chip or negative-hook blade for worktops, and a reverse-tooth jigsaw blade for laminate flooring cut face up. |
| Acrylic | A triple-chip negative-hook blade on a table saw, or score-and-snap for thin sheet — and keep the feed steady so it does not melt. |
| Glass | None — a tungsten carbide scoring wheel, one firm pass with oil, then snap it. And toughened glass cannot be cut at all. |
| Plastic pipe | A fine 24 TPI hacksaw or a proper pipe cutter — and deburr the inside afterwards, which is the step people skip. |
Common questions
- Which blade cuts plasterboard?
- A utility knife for straight cuts and a jab saw or multi-tool for cutouts — a circular saw is the wrong tool entirely.
- What should I avoid?
- Blind plunge cuts near sockets, switches and consumer units A circular saw, which produces enormous dust for no benefit Cutting a board resting on the floor edge-on; support it flat or vertically against a wall
Related pages
- Which blade cuts metal? A bi-metal or carbide-tooth blade with at least three teeth in the cut — that tooth-count rule matters more than the machine.
- Which blade cuts tile? A continuous-rim diamond blade with water — and cut wet, because dry cutting tile produces respirable silica dust.
- Which circular saw blade for wood? 24 teeth for ripping and framing, 40 for general work, 60-80 for a clean crosscut finish.
- Which blade cuts plywood without tearout? A sharp 60-80 tooth blade, a scoring pass, tape on the line, and the good face oriented for the tool you are using.
- Which blade cuts brick? A segmented-rim diamond blade, cut wet or with on-tool extraction — brick and mortar dust is a serious silica hazard.
- Which blade cuts laminate? A triple-chip or negative-hook blade for worktops, and a reverse-tooth jigsaw blade for laminate flooring cut face up.
- Which blade cuts acrylic? A triple-chip negative-hook blade on a table saw, or score-and-snap for thin sheet — and keep the feed steady so it does not melt.
- Which blade cuts glass? None — a tungsten carbide scoring wheel, one firm pass with oil, then snap it. And toughened glass cannot be cut at all.
- Which blade cuts plastic pipe? A fine 24 TPI hacksaw or a proper pipe cutter — and deburr the inside afterwards, which is the step people skip.
- Which screw should I use for plasterboard? Screw
Sources
- Typical range compiled from manufacturer specifications — At One Place