Stainless steel, Rendering, PVCu

When planning an outdoor rendering project, it’s important to remember to choose beads made of stainless steel or PVCu

Building requirements outlined by NHBC and LABC only advocate the use of austenitic stainless steel or PVCu beads in all external rendering applications, anywhere in the UK. Galvanised steel beads are no longer accepted for external rendering in any situation.

But don’t worry, our extensive range of beads and mesh make plastering and rendering simple.

Our SAB-S Standard Angle Bead has been designed to prevent chipping and cracking to vulnerable corners.

ERS-S Render Stop Bead provides aesthetic, enhanced weathering detail, along with reinforcement to resist impact damage.

The PSB-S Mesh Wing Plaster Stop Bead has numerous potential applications internally and externally including those at openings, abutment of walls and for ceiling finishes.

The MVB-S Movement Bead consists of two lengths of Stop Bead linked with a white PVC extrusion.

‘Providing reinforcement and resisting impact damage’

Simpson Strong-Tie sales director Jon Head explains: “We only recommend the use of stainless steel or PVCu products for external applications. Galvanised steel beads should not be used externally.

“Although it’s generally known for its corrosion-resistant properties, galvanised steel can react with the chemical components in render, which will lead to quality issues, from unsightly rust stains to the degradation of the bead and possible cracking in the render

“Simply put, galvanised steel in external rendering may rust, which will reduce the lifespan of your work and can be costly to put right. But the good news is it’s easily avoided.

“Stainless steel beads are specifically designed for cement-based renders and our range of stainless steel angle beads, bellcast beads, stop beads and movement beads, and the PVCu plastic alternatives, have been engineered to provide reinforcement and resist impact damage.

“Our range of beads makes bellcasts, corners, stops and abutments all easier to form and they can be cut to size as required.”

For rendering and plastering made simple, download the Simpson Strong-Tie 2020 catalogue at, which is packed with handy tips and installation guidance… and make sure you stay away from Rusty!


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