Measuring and Cutting Plasterboard

Module 4: Measuring and Cutting Plasterboard

Accurate Measuring Techniques

Precision is crucial in dry-lining to ensure tight fits and professional finishes.

Key Measuring Methods:

1. Double-Check Dimensions – Measure twice, cut once to avoid costly errors.

2. Account for Obstructions – Mark positions of pipes, sockets, and studs before cutting.

3. Use a Notched T-Square – Ensures straight, square lines when marking cuts.

4. Transfer Measurements Clearly – Use a pencil or chalk for visible guidelines (avoid pens that bleed).

5. Consider Expansion Gaps – Leave 2-3mm at edges to prevent cracking from building movement.

Pro Tip:

• For large areas, snap a chalk line for long straight cuts.

Cutting Methods for Different Shapes

1. Straight Cuts (Most Common)
✔ Score-and-Snap Method:

• Score the front paper layer deeply with a utility knife.

• Bend the board backward to snap the gypsum core.

• Cut the rear paper layer to separate.
  ✔ Plasterboard Saw:

• Used for quick rough cuts (less precise than score-and-snap).

2. Curved Cuts (Arches, Circles)
✔ Template Method:

• Create a cardboard template for complex shapes.

• Transfer the outline to the plasterboard.
  ✔ Jigsaw with Plasterboard Blade:

• Best for tight curves and circular cuts (e.g., downlights).

3. Openings for Sockets, Switches & Pipes
✔ Measure & Mark:

• Trace the outline of the socket box onto the board.
  ✔ Drill Starter Holes:

• Use a drill to create corners for internal cuts.
  ✔ Cut with Keyhole Saw or Jab Saw:

• Carefully follow the marked lines for a snug fit.

Pro Tip:

• For pipes, cut a slightly larger hole and use a plasterboard grommet for a clean finish.

Minimising Waste

Reducing material waste saves costs and improves efficiency.

Best Practices:

✔ Plan Board Layout – Optimize sheet placement to minimize offcuts.
✔ Use Offcuts First – Small pieces can fill gaps above doors or below ceilings.
✔ Nest Cuts – Arrange multiple cutouts (e.g., sockets) close together on one board.
✔ Store Usable Offcuts – Keep larger pieces (>300mm) for future repairs.
✔ Order Correct Sizes – Some suppliers offer custom-sized boards to reduce cutting.

Common Waste Sources to Avoid:
❌ Overcutting due to inaccurate measurements.
❌ Poor handling leading to broken boards.
❌ Not reusing offcuts in less visible areas.

Summary Table: Cutting Techniques

Final Advice:

• Always wear a dust mask when cutting to avoid inhaling gypsum particles.

• Keep blades sharp for cleaner cuts and less board damage.