When to use meshed beads

When to use meshed beads

On lightweight substrates susceptible to movement, such as blueboard, beads are highly recommended on corners to assist with the aesthetics of the final finish.

However, sometimes when movement occurs, standard beads may still come away from the substrate, causing cracking in the final surface. The use of mesh beads (pictured) is a great way to reduce the risk of cracking.

The mesh in these beads reduces the risk of visible cracking due to substrate movement by creating a barrier between the substrate and base coat render, and the top coat render. The substrate hairline cracks only go as far as the mesh, while the render top coats remain uncracked.

Substrate movement can occur due to changes in moisture in soil (i.e. from rainfall or extended dry heat periods, or vegetation roots soaking up moisture). Sometimes this movement causes structural cracking in substrates, which requires a building professional to fix.

Sometimes these changes in soil moisture cause minor substrate movements that can lead to hairline cracks in render or can cause standard beads to come away from the substrate. The use of acrylic renders provides additional flexibility, which reduces the likelihood of visible hairline cracking in the render. The use of mesh reduces this risk even further. However, the use of mesh may not prevent visible structural (large) cracks showing.

Mesh can be applied to the entire substrate in the first layer of a suitable render to reduce the visibility of hairline cracking. Meshed beads ensure the same protection for the corners of your substrate. They also increase the adhesion of the render system to the substrate compared to standard beads.

Meshed beads are highly recommended for use on Natural Materials systems for interior projects (ROCKCOTE does not recommend the use of Natural Materials over lightweight walling systems for exterior projects), EPS substrate systems, and lightweight substrate systems (such as blueboard). Meshed beads can be used on both outer corners and inner corners of substrates.

For more information about when to use meshed beads, contact ROCKCOTE Customer Service on 1300 736 668.


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