Plasterboard & Plastering Supplies: Mistakes to Avoid When Buying

In depth

Choosing the right plasterboard and associated supplies for your project can feel overwhelming. It’s easy to get caught up in marketing jargon and confusing technical details, leading to costly mistakes before you even start. Many homeowners find themselves with excess materials, unnecessary extras, or simply the wrong products altogether. Let's examine some common pitfalls when buying these essentials and outline how to ensure a smoother, more efficient purchase.

One of the most frequent errors is selecting plasterboard based solely on its thickness. While thicker boards – like 19mm or 24mm – offer greater strength and can handle heavier applications such as feature walls, they’re often vastly overspecified for standard internal partition work. Most residential projects require only 12.5mm or 18mm boards. Buying unnecessarily thick plasterboard adds to the overall cost without providing a proportional benefit, and significantly increases the weight of your wall structure. To avoid this, carefully assess the load-bearing requirements of the area you're plastering. Consult with a building professional if you’re unsure – a simple structural assessment can save you considerable money in the long run by ensuring you purchase the appropriate thickness from the outset.

Another significant oversight concerns jointing systems and accessories. Plasterboard comes with various jointing options: rag joints, coving joints, or pre-bed joint edges. Many buyers are drawn to complex coving systems simply because they 'look nice,' but if you’re not planning a decorative cornice, the cost of the moulding, fixings, and specialist tools is often wasted. Similarly, selecting a board with a pre-bed joint edge for every single joint adds unnecessary expense. Standard boards with edges designed for rag or coving joints are perfectly adequate, especially for beginners. It's crucial to identify your intended finish and select the corresponding jointing system – and only purchase the accessories you’ll actually use.

Furthermore, consider the impact of ‘running costs’ associated with your chosen materials. Some plasterboards boast enhanced features like moisture resistance or acoustic properties, which may seem advantageous but can dramatically increase the price. Unless your project specifically demands these qualities (e.g., a bathroom wall or a room requiring soundproofing), you're likely paying for performance that won't be utilized. Standard gypsum plasterboard is perfectly suitable for most internal applications and offers excellent value. Don’t be swayed by inflated specifications; focus on the core function of providing a stable substrate for your plaster finish.

Don’t fall into the trap of solely focusing on the headline specification of a board – such as its density or ‘fire rating.’ These figures often appear prominently in marketing materials but can be misleading if not properly understood. The Fire Standard (F) rating indicates how well a board resists flame spread, while the Moisture Resistance (M) rating denotes its ability to withstand damp conditions. However, these ratings are influenced by factors beyond just the board itself, such as the type of adhesive used and the quality of the finishing plaster applied. Research the entire system – not just the board – to ensure it meets your requirements effectively.

Finally, pay close attention to the quantity you’re purchasing. It's incredibly common for homeowners to buy more plasterboard than they actually need, often due to miscalculating wall areas or buying in bulk based on perceived ‘deals.’ Accurate measurement is absolutely key; double-check dimensions and account for waste – typically around 10% – when calculating your requirements. Consider purchasing smaller quantities initially if you're unsure of the final amount needed; it’s far better to have slightly leftover than to be left short mid-project, which can lead to delays and additional purchases.

Don’t forget that plastering itself isn’t just about applying plaster to a board. You’ll need to factor in the cost of screeds, bonding agents, plaster mixing equipment (a dedicated drill mixer is highly recommended), joint tape, and finishing materials like float finish or skimming plaster. These additional components can represent a significant portion of the overall budget, so research them thoroughly alongside your plasterboard selection – ensuring that everything you purchase works synergistically with your chosen board to deliver a professional result.