A Daily Renovation Tip | Mesh Tape

The mesh tape serves one primary purpose: to prevent cracking caused by the shrinkage of plaster and putty as they dry.

It works much like our skin: when dehydrated, it cracks. Embedded within the wall, the mesh tape holds the surface together and disperses the forces of shrinkage, preventing cracks from widening or spreading.

Think of it as the "skeleton" hidden inside the wall; while it may look soft and pliable, it is actually capable of withstanding significant stress.

You don't need to apply mesh tape to every single wall—doing so is unnecessary and a waste of money. However, there are specific scenarios where using it is absolutely essential:

Scenario 1: Areas where channels were cut for plumbing and electrical work. During renovation, walls are often channeled to bury pipes and conduits. This process compromises the wall's structural integrity, making these areas highly prone to cracking. After the contractor fills the channel with mortar, mesh tape must be applied over the opening before the final plastering stage; otherwise, a distinct crack will soon appear along the channel line.

Scenario 2: Junctions between different wall materials. Examples include the connection point between a brick wall and a concrete column, or the seam where drywall meets a masonry wall. These materials expand and contract at different rates; temperature fluctuations can easily cause them to pull apart and crack. When applying mesh tape here, it should extend at least 100 millimeters onto both surfaces, acting as a buffer to prevent cracking.

Scenario 3: Renovating older homes. Walls in older homes often suffer from issues like loose, sandy surfaces or hollow spots (delamination); once the old coating is scraped off, the underlying substrate is often unstable. Applying a layer of mesh tape strengthens the bond between the new plaster and the old wall surface, reducing the likelihood of future cracks. When I renovated my own older home, I applied mesh tape to every wall; three years later, the walls remain perfectly smooth and intact. Additionally, mesh tape is required for large plastered areas—such as a living room wall exceeding 30 square meters. With such a large surface area, the forces of shrinkage in the plaster layer become concentrated, making the wall prone to cracking; the mesh tape helps disperse these forces.