Plasterboard wall installation is a common task for home improvement enthusiasts. It’s a relatively straightforward process, but it’s easy to underestimate the attention to detail it demands. Even small errors can result in an unprofessional finish, reduced durability, or costly repairs down the line. Whether you’re renovating a room or building a partition wall, understanding and avoiding common DIY mistakes is key to achieving a high-quality result.
Choosing the Wrong Type of Plasterboard
One of the most common mistakes in plasterboard wall installation is using the wrong type of plasterboard for the environment. Standard plasterboard may be suitable for most dry interior spaces, but for areas exposed to moisture—like bathrooms or kitchens—moisture-resistant plasterboard is essential. Similarly, fire-rated plasterboard is crucial for areas requiring fire protection, and soundproof plasterboard is ideal for walls separating rooms that need noise insulation. Choosing the right type from the start prevents future issues and ensures the wall serves its intended purpose.
Poor Measurement and Planning
Accurate measurements and detailed planning are the foundation of any successful plasterboard wall installation. A common DIY error is cutting boards based on rough estimates, leading to gaps, uneven edges, or wasted materials. Before starting, measure each wall carefully, accounting for windows, doors, and ceiling height. Plan the layout to minimize the number of joints and offcuts. Double-checking your measurements saves time and frustration later in the project.
Incorrect Fixing Methods
Improper fixing methods can cause plasterboards to sag, crack, or even fall. One mistake is using the wrong type or insufficient number of screws or nails. Fasteners should be spaced every 200mm on ceilings and every 300mm on walls. Additionally, they must be slightly sunk below the surface without breaking the paper lining. Overdriving screws can weaken the board, while underdriving leaves bumps that interfere with plastering or painting. Always use screws designed for plasterboard, preferably with a drywall screw gun for consistent depth.
Skipping the Use of a Stud Finder
Many DIYers skip the critical step of locating studs and support structures behind the surface. Installing plasterboard directly onto uneven or unsupported surfaces leads to instability. A stud finder helps identify where to fix the board securely. Relying on guesswork can result in fastening plasterboards only to the plaster or drywall, which lacks the strength to hold them over time. Always mark out stud positions before installation to ensure proper fixing.
Failing to Stagger Joints
Another mistake during plasterboard wall installation is aligning vertical joints between sheets. This weakens the structure and creates noticeable seams that are difficult to hide, even after taping and jointing. Staggering joints not only adds strength to the wall but also helps blend seams more seamlessly during finishing. Plan the layout so that joints don’t fall in a straight line on adjacent sheets.
Overlooking Joint Treatment
The finish of a plasterboard wall largely depends on the quality of joint treatment. Skipping taping, using poor-quality joint compound, or applying uneven coats can result in visible lines, cracking, and peeling paint. For a smooth finish, use paper or fiberglass tape over all joints, then apply several thin coats of joint compound, feathering out each layer wider than the last. Allow each coat to dry completely before sanding and applying the next.
Ignoring Expansion Gaps
Not leaving appropriate expansion gaps is a subtle but crucial oversight. Plasterboard expands and contracts slightly with changes in temperature and humidity. Without expansion gaps (usually around 5mm between boards and structural edges), this movement can cause boards to buckle or crack. Always use packers or spacers to maintain consistent gaps, especially around ceilings, floors, and corners.
Improper Cutting Techniques
Many DIYers use utility knives or saws without a guide, resulting in jagged edges, broken corners, or inaccurate cuts. Clean cuts are essential for tight-fitting joints and seamless finishes. To cut plasterboard correctly, score the paper surface with a sharp knife along a straight edge, snap the board cleanly, and then cut through the paper on the back side. For outlets or windows, use a plasterboard saw or rotary tool for more precise shapes.
Not Securing Ceiling Boards First
When installing plasterboard walls in a room, always start with the ceiling. This is a common oversight that can lead to gaps between the wall and ceiling or reduce structural integrity. Ceiling boards help lock wall panels into place, and finishing is cleaner when ceiling boards are installed first. Use a T-brace or plasterboard lifter to hold ceiling boards while securing them.
Rushing the Finishing Process
The final finish can make or break a plasterboard wall installation. Rushing through sanding, skipping priming, or applying paint too early often results in an uneven, amateur-looking surface. Take time to sand all joints smoothly and check with a light for imperfections. Always apply a primer-sealer before painting to ensure even paint absorption. Skipping this step can leave the wall looking patchy and affect paint durability.
Final Thoughts
Plasterboard wall installation can be a rewarding DIY project when done correctly. However, the details matter. From selecting the appropriate materials and planning the layout to executing precise cuts and finishing carefully, every step plays a crucial role in the outcome. By avoiding these ten common mistakes, you can ensure your plasterboard wall is strong, smooth, and long-lasting. Preparation, patience, and the right tools are your best allies in achieving a professional-quality finish.