plastering corner bead

Quick Answer: Corner bead is a reinforcing strip (metal, plastic, or paper-faced) installed on external corners before plastering to create a crisp, durable 90-degree edge. In 2026, galvanised steel beads remain the professional standard for domestic work, typically costing £1.20-£2.50 per metre, while flexible plastic beads have gained popularity for curved walls and arches. Proper installation requires embedding the bead in bonding coat or fixing with drywall nails, then skimming over with finishing plaster to achieve a smooth, protected corner that won’t chip or crack. What Is Corner Bead and Why It’s Essential for Professional Plastering Corner bead—also called angle bead—is one of those plastering essentials that separates professional work from amateur efforts. It’s a pre-formed metal, plastic, or composite strip installed on all external (outward-facing) corners before you apply finishing plaster. Without corner bead, plaster corners are vulnerable. They chip easily from knocks, furniture impacts, and vacuum cleaners. They’re difficult to form accurately by hand, and they rarely stay straight over time as buildings settle and plaster cures. The primary functions of corner bead include: Creating a perfectly straight, crisp 90-degree corner edge Reinforcing the corner to prevent impact damage and chipping Providing a guide for plastering to the correct depth Speeding up the plastering process significantly Ensuring consistency across all corners in a room or building According to British Gypsum’s technical guidance, proper corner reinforcement is considered essential for achieving BS 8000-8 standards for plastering workmanship. Every professional plasterer in 2026 carries a selection of corner beads in their van. Types of Corner Bead Available in 2026 The corner bead market has evolved significantly over the past decade. While galvanised steel remains dominant, plastic and composite options have improved considerably. Here’s what’s available at your local builders’ merchant: Galvanised Steel Corner Bead (The Professional Standard) Galvanised steel bead is the traditional choice and still accounts for roughly 70% of corner bead installations in UK domestic plastering. It’s manufactured from thin gauge galvanised steel with perforated wings for keying into the plaster. Typical dimensions are 3 metres long with a 25mm nose (the visible corner edge) and 35-50mm wings on each side. The standard thickness is 0.5mm gauge steel, providing excellent rigidity without adding excessive build-up. Advantages: Creates the sharpest, most durable corner finish Stays perfectly straight—no bowing or warping Handles heavy impacts without crushing Compatible with all plaster types Cost-effective at £1.20-£1.80 per 3m length from Screwfix or Wickes Disadvantages: Can rust if exposed to prolonged moisture before plastering Sharp edges require careful handling Not suitable for curved walls or arched openings Visible through thin skim coats if not bedded properly PVC Plastic Corner Bead (Flexible and Rust-Free) Plastic corner bead has improved dramatically since the early versions from the 2000s. Modern PVC beads feature enhanced rigidity and better plaster adhesion profiles. These beads are particularly popular for renovation work where existing corners may not be perfectly square or straight. The flexibility allows them to follow slight irregularities in the substrate. Key applications include: Curved walls and radius corners Arched doorways and feature walls Bathrooms and wet rooms (completely rust-proof) External renders where moisture is present Pricing ranges from £1.80-£2.50 per 3m length. The premium reflects the manufacturing process and material costs, but it’s worth it for specific applications. Paper-Faced Bead (For Plasterboard Systems) Paper-faced metal bead combines a thin metal reinforcing strip with paper facings that tape directly onto plasterboard. This type is specifically designed for drywall systems rather than wet plastering. The paper edges accept jointing compound (like Gyproc EasiJoint) and blend seamlessly into the plasterboard surface. Professional drywall installers prefer these because they eliminate the need for plaster dabbing to fix the bead. These beads cost £2.20-£3.00 per 3m length and are stocked by specialist drywall suppliers like Travis Perkins and Jewson. Thin Coat Bead (For Skim-Only Applications) A more recent innovation is the thin coat bead, designed specifically for skim coat applications over plasterboard. These have a much lower profile—typically 6-8mm total build-up compared to 12-15mm for standard beads. They’re ideal for modern new-builds where walls are plasterboarded and only receive a 2-3mm skim coat. The thinner profile prevents the corner bead from showing through or creating a noticeable ridge. Bead Type Best Use Cost per 3m Build-Up Installation Method Galvanised Steel Standard corners, wet plaster £1.20-£1.80 12-15mm Bonding/nails PVC Plastic Curves, arches, wet areas £1.80-£2.50 12-15mm Bonding/adhesive Paper-Faced Plasterboard/drywall £2.20-£3.00 10-12mm Jointing compound Thin Coat Skim-only systems £2.00-£2.80 6-8mm Adhesive/nails How to Install Corner Bead: Professional Techniques Proper installation is critical. A poorly fixed corner bead will show ridges, create hollow spots, or worse—fall off mid-way through plastering. Here’s how professionals do it in 2026: Method 1: Bedding in Bonding Coat (Traditional Wet Method) This is the most common method for traditional two-coat plastering on brick, block, or lath. It creates the strongest bond and allows for adjustment if walls aren’t perfectly plumb. Step-by-step process: Cut the corner bead to length using tin snips (for metal) or a hacksaw. Always cut 5-10mm short of floor-to-ceiling to allow for skirting boards and coving. Mix a small amount of bonding plaster slightly stiffer than normal working consistency—you want it to hold the bead without slumping. Apply vertical dabs of bonding down both sides of the corner, roughly 50-75mm wide and 150-200mm apart. Press the corner bead firmly into the bonding, ensuring the nose sits proud of the surrounding wall by the thickness of your finishing coat (typically 2-3mm). Use a spirit level to check vertical alignment. Adjust by pressing or pulling as needed while the bonding is still workable. Run your trowel down both wings to remove excess bonding and feather the edges. Allow to set for 30-45 minutes before applying your main basecoat. The bonding creates mechanical keying through the perforations and provides a solid bed that won’t move during subsequent plastering operations. Method 2: Mechanical Fixing with Drywall Nails For plasterboard backgrounds, mechanical fixing is faster and eliminates waiting time. This method uses 30-40mm galvanised drywall nails or staples. Nail through the