Installing wallboard may look simple, but small errors can lead to big problems later. From cracked joints to failed inspections, the right technique is essential for lasting performance and a professional finish.
At CB Building Products, we supply wallboards every day to contractors across the UK. We also speak to builders dealing with the consequences of incorrect installs.
Here are the most common mistakes – and how to avoid them
1. Using the Wrong Fixings
Using standard screws or nails might save time, but it often leads to board movement or cracking.
How to Avoid It:
- Always use drywall screws that are the correct length for your board thickness and frame depth.
- Fix screws every 200mm on ceilings and 300mm on walls.
- Make sure screw heads are slightly recessed but not breaking the paper face.
Tip: Refer to our wallboard fixing guide for the correct screw type and spacing.
2. Poor Joint Treatment
Failing to tape, fill, and finish joints properly can lead to visible lines, cracking, and paint defects.
How to Avoid It:
- Use joint tape (paper or mesh) over all board joins.
- Apply jointing compound in two to three coats, sanding between each.
- Don’t over-sand and avoid applying compound in cold or damp conditions.
Why it matters: Poor joint treatment affects both appearance and fire resistance.
3. Incorrect Board Orientation
This one’s easily overlooked, especially by newer installers. Most wallboards are designed to be installed with the long edge horizontal.
How to Avoid It:
- On walls: Fix boards horizontally across studwork. This reduces joint numbers and improves strength.
- On ceilings: Run boards perpendicular to joists to avoid sagging.
Remember: Following correct wallboard orientation tips improves rigidity and reduces cracks.
4. Gaps Between Boards
Leaving excessive gaps between boards leads to movement, cracking, and inefficient jointing.
How to Avoid It:
- Cut boards precisely, aiming for a 2-3mm gap max.
- Avoid force-fitting boards, which can cause damage.
- Fill any gaps greater than 3mm with compound before taping.
Pro tip: Boards should be fitted snugly, but not under pressure.
5. Ignoring Moisture or Fire Zones
Using the wrong board in the wrong place can cause long-term problems and breach UK Building Regulations.
How to Avoid It:
- Bathrooms, kitchens, utility rooms: Use moisture-resistant wallboards.
- Garages, stairwells, lofts: Use fire-rated wallboards.
Always match the board to the room application to maintain compliance.
6. Over-Tightening Fixings
Screws driven too deep can damage the board’s paper surface, weakening fixings and joints.
How to Avoid It:
- Use a screw gun with depth control.
- Stop once the screw head is flush or slightly recessed.
- Check each fixing before taping.
Why it matters: Damaged boards compromise the fire rating and integrity of the drylining system.
7. Failing to Stagger Joints
Stacking joints vertically across rows creates weak points, especially in large installations.
How to Avoid It:
- Stagger horizontal joints between board rows.
- Avoid continuous vertical seams up full walls.
Drylining installation best practice always includes staggered joints for strength.
8. No Allowance for Movement
Buildings move. Wallboards need space to accommodate expansion and contraction.
How to Avoid It:
- Leave a 5-10mm gap at wall edges and around ceilings.
- Use edge trims where needed.
Movement gaps reduce the risk of corner cracks and ceiling edge separation.
9. Skipping Pre-Check of Studwork
Uneven or incorrectly spaced studwork will always lead to issues.
How to Avoid It:
- Check stud spacing before boarding (typically 400mm or 600mm centres).
- Ensure noggins are installed at board edges.
- Confirm all fixings will land on solid framing.
Plan ahead: Quality drylining starts with correct framing.
10. Neglecting Site Conditions
Humidity and temperature affect jointing and board integrity.
How to Avoid It:
- Don’t install boards in rooms with active leaks or unventilated damp.
- Keep rooms at a stable temperature.
- Store boards flat, off the ground, and away from moisture.
Why it matters: Drylining installed in bad conditions leads to bubbling, softening, and finish failure.
CB Building Products: Helping You Get It Right First Time
We supply a full range of wallboards, fixings, and accessories to ensure your drylining project goes smoothly. Whether you’re working on a full newbuild or a bathroom refurb, our team can guide you on best-fit products and application methods.
We know how to install wallboard correctly for drylining, and we’re here to help you do the same.
FAQs
1. What size screws should I use for plasterboard?
Typically 32-38mm for 12.5mm boards into timber, or 25mm into metal studs.
2. Should I tape every joint?
Yes. All board joints and corners should be taped and filled for performance and finish.
3. Can I dryline over old plaster?
Yes, but check the wall is sound and use appropriate adhesive or framing.
4. How long should joint compound dry?
Usually 12-24 hours per coat, depending on conditions.
Need Products or Advice?
Avoid these mistakes with help from CB Building Products. We supply trusted brands and can support your next project with advice, stock, and delivery.
Email: info@cbbuildingproducts.co.uk
Call: 01527 359 047