Chicken Mesh for Plastering: When and Why to Use It

Chicken mesh — also called wire mesh or stucco netting — is a reinforcement material used in plastering to strengthen walls, prevent cracking, and improve the bonding of plaster to the substrate. While it is not required for every plastering job, it plays an important role in certain situations. Here's what you need to know.

What Is Chicken Mesh?

Chicken mesh is a woven wire mesh made from galvanised steel. In the context of plastering, it is embedded into the plaster layer before the plaster sets — effectively acting as a skeleton that holds the plaster together. The term "chicken mesh" comes from its original agricultural use, but the same hexagonal wire mesh pattern is widely used in construction plastering and stucco applications.

Why Use Chicken Mesh in Plastering?

1. Crack Prevention

When walls experience minor movement — due to settlement, temperature changes, or vibration — unrestrained plaster can develop cracks. Wire mesh distributes stress across a wider area rather than concentrating it at a single point, dramatically reducing the formation and propagation of cracks.

2. Improved Adhesion at Joints

At junctions between different materials — for example, where a brick wall meets a concrete column, or where AAC blocks meet concrete beams — the two materials have different thermal expansion rates. Without reinforcement, cracks commonly appear at these transitions. A strip of wire mesh bridging the junction prevents these differential-movement cracks.

3. Structural Reinforcement for Thicker Applications

When a thick plaster application is required — particularly for levelling uneven walls or applying external renders — wire mesh provides the structural support needed to hold the thicker plaster layer in place without sagging or delaminating.

4. Better Performance Over Hollow Blocks

Hollow concrete blocks provide a less consistent bonding surface than solid brick or AAC. Wire mesh embedded in the first plaster coat improves adhesion across the hollow sections, preventing differential cracking.

When Is Chicken Mesh Needed?

• At material transitions: Wherever two different substrates meet (brick-to-concrete, AAC-to-RCC beam)
• Thin or hollow block walls: Where the substrate surface may flex slightly
• External plastering: For exterior walls exposed to temperature variation and weathering
• Areas prone to vibration: Near doorframes, window openings, mechanical rooms
• Renovation over old plaster: When applying new plaster over previously cracked surfaces

Is Chicken Mesh Used With Gypsum Plastering?

In standard gypsum plastering on interior walls, chicken mesh is typically not required. Gypsum's natural resistance to shrinkage cracks means most interior walls do not need mesh reinforcement when plastered with gypsum.

However, at material junction points — such as where a concrete column meets a brick wall — applying a strip of galvanised mesh over the joint before gypsum plastering is good practice. This prevents the hairline crack that often appears at these transitions from reappearing through the plaster surface.

Application Method

1. Clean the substrate thoroughly — remove dust, loose material, and any efflorescence
2. Apply a bonding agent or primer coat where required
3. Fix the wire mesh to the wall with staples, nails, or embedded into a base coat of plaster
4. Ensure the mesh lies flat with no gaps or wrinkles
5. Apply the main plaster layer over the mesh, ensuring full embedment
6. Level and finish as required