corner beads for plastering

Quick Answer: Corner beads are metal or plastic profiles fitted to external corners before plastering to create crisp, durable edges that resist impact damage. The most common types in 2026 are galvanised steel beads (£1.50-£3 per length), stainless steel (£4-£7), thin coat beads (£2-£4), and flexible PVC variants (£2.50-£5). Professional plasterers fix them with dabs of bonding plaster or drywall adhesive, then skim over them to create a seamless, straight finish that will last decades. Why Corner Beads Matter More Than You Think Every experienced plasterer knows that external corners are the Achilles heel of any plastered wall. Without proper reinforcement, these edges chip, crack and crumble within months—especially in high-traffic areas like hallways, doorways and around windows. Corner beads solve this problem by creating a rigid framework that the plaster keys onto. They’re one of those finishing touches that separate amateur DIY jobs from professional work, and in 2026, with property values and renovation standards higher than ever, getting them right isn’t optional. The British Gypsum technical library specifies corner beading as essential for all external angles in drylining and plastering applications, particularly where corners are vulnerable to impact or wear. Types of Corner Beads: Which One Should You Use? Walk into any Screwfix or Wickes and you’ll find at least six different types of corner beads. Here’s what actually matters for your project: Type Material Best Use Price (2026) Standard angle bead Galvanised steel Traditional wet plaster, 90° corners £1.50-£3 per 2.4m length Thin coat bead Galvanised steel/aluminium Skim coating over plasterboard £2-£4 per 2.4m length Flexible corner bead PVC with mesh wings Curved walls, archways, irregular angles £2.50-£5 per 2.4m length Stainless steel bead 304 stainless steel Wet areas, external render £4-£7 per 2.4m length Paper-faced bead Metal with paper flanges Tapered edge plasterboard joints £1.80-£3.50 per 2.4m length Expansion bead PVC with movement joint Between dissimilar materials £3-£6 per 2.4m length Standard Galvanised Angle Beads These are the workhorses of the plastering trade. 19mm or 25mm nose width are the standard options, with perforated or expanded metal wings that key into the plaster. I’ve fitted thousands of these over the years, and they’re still the best choice for traditional sand-and-cement render or multi-finish plaster applications. The galvanised coating prevents rust, though you should avoid them in permanently wet areas. Thin Coat Beads for Modern Drylining The building industry has shifted massively toward drylining with plasterboard and skim coating, and thin coat beads are designed specifically for this. They typically have a 3mm or 6mm plaster depth, which matches perfectly with a two-coat skim application. Brands like Protektor and ClarkDietrich dominate this market in the UK. At around £2.50 per length from Travis Perkins, they’re cost-effective and create incredibly crisp edges when fitted properly. Flexible PVC Beads for Curves and Archways Here’s where modern materials solve old problems. Traditional metal beads can’t bend without kinking, but flexible PVC beads can follow curves, arches and off-angle corners without complaint. The mesh wings embed beautifully in plaster, and because they’re PVC, they won’t rust even in damp conditions. I use these extensively for curved feature walls and archway renovations—they’ve completely replaced the old technique of cutting metal beads every 50mm to force them around curves. Pro Tip: When ordering corner beads, always buy 10-15% extra. You’ll need offcuts for short sections, and having spares prevents project delays when you inevitably damage one during fitting. A standard 2.4m length covers most floor-to-ceiling heights with minimal waste. How to Fix Corner Beads: The Professional Method Anyone can stick a corner bead up with a few dabs of plaster. Getting it perfectly straight, plumb and true is what separates professionals from DIYers. Tools You’ll Need Spirit level (1200mm minimum for accurate readings) Tin snips or hacksaw for cutting beads to length Bucket and mixing drill for bonding adhesive Trowel for applying dabs Corner trowel (optional but makes finishing easier) Straight edge for checking alignment Step-by-Step Installation Step 1: Measure and Cut Measure from floor to ceiling (or to your required height) and cut the bead 2-3mm short. This prevents the ends buckling if the floor or ceiling isn’t perfectly level. Use tin snips for thin gauge beads or a hacksaw for heavier profiles. Step 2: Mix Your Adhesive Most plasterers use Gyproc Dri-Wall Adhesive or bonding plaster for fixing beads. Mix to a thick, porridge-like consistency—it needs to hold the bead firmly without slumping. You want a working time of about 20-30 minutes, so don’t mix more than you can use in that window. Step 3: Apply Dabs Apply vertical dabs of adhesive every 400-600mm along both sides of the corner. Each dab should be about 50mm wide and proud of the wall surface by 3-4mm—this gives you adjustment room. Step 4: Press and Align Push the bead firmly into the corner, ensuring the nose sits exactly on the corner line. This is critical—if the bead twists even slightly, your finished corner will look wavy. Use your spirit level vertically and a straight edge horizontally to check alignment. Press the bead into the adhesive dabs, adjusting until it’s perfectly plumb in both directions. ⚠️ Warning: Never rely on the wall surface itself to plumb your corner bead. Walls are rarely perfectly straight. Always use a spirit level and check from multiple angles. A bead that’s out of plumb by even 2-3mm over a 2.4m height will be glaringly obvious once plastered. Step 5: Clean Excess Adhesive Remove any adhesive that’s squeezed through the perforations or mesh. These bumps will create problems when you skim over them later. A clean edge makes plastering much easier. Step 6: Let It Set Allow at least 24 hours for the adhesive to fully cure before plastering. Bonding plaster can be ready in 2-3 hours in warm conditions, but overnight is safer, especially in winter. Plastering Over Corner Beads: Getting That Perfect Edge The bead creates the framework, but your plastering technique determines the final quality. Here’s what works: First Coat Application Apply your base coat