Render Mesh

Render mesh sits at the core of any reliable render system, reinforcing basecoats to control movement and prevent cracking over time. Here at bio space, we supply alkali-resistant fibreglass render mesh designed to work seamlessly with lime plasters, renders and internal & external wall insulation systems, giving you consistent strength across the full surface. Standard 1m x 50m rolls make it easy to cover large areas efficiently, helping to maintain the integrity of the plaster. Bulk options are available for trade and larger projects, so you can keep jobs moving without delays.

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Frequently asked questions
What is render mesh and why is it used?

Render mesh is a fibreglass reinforcement layer embedded into the basecoat of plaster or render to distribute stress and prevent cracking. It strengthens the system and improves long-term durability, particularly on larger or mixed substrates.
What does alkali-resistant render mesh mean?

Alkali-resistant mesh is coated to protect the glass fibres from the high pH found in lime-based renders. Without this coating, the fibres would degrade over time, reducing the strength of the system.
What size and weight of render mesh should I use?

2.5mm aperture mesh can be used for finer work, 4mm for plastering onto wood fibre, wood wool and cork boards, and 10mm sizing is better suited to high-stress areas or external systems.
How do you install render mesh correctly?

Render mesh should be embedded into the wet basecoat, pressed in evenly, and overlapped at joints by a minimum of 100mm, ensuring the mesh is troweled until no longer visible. It should sit within the top third of the basecoat to provide effective reinforcement once the system cures.
Is render mesh suitable for lime plaster and breathable systems?

Yes, fibreglass render mesh works well within breathable systems, including lime-based renders and plasters. It helps stabilise the surface without restricting vapour movement, making it suitable for both renovation and new build applications.