Technical / Structural

The Cold Joint Killer: Bonding New Concrete to Old

One of the most common failures in Maltese renovations is Delamination. This happens when a contractor pours a new screed or concrete layer over an existing slab.

Concrete does not stick to concrete. It needs a chemical bridge.

The ZNR Latex "Slurry" Method

To ensure a monolithic bond, you cannot just use water. You need ZNR Latex (SBR Copolymer).

The Bonding Bridge Recipe

Mix Ratio:
1 Part Cement
1 Part Sand
Liquid: 1 Part Water + 1 Part ZNR Latex

Method: Brush onto the old surface while wet. Pour new concrete immediately (Wet-on-Wet).

This creates a polymer chain that links the two concrete ages together, preventing hollow sounds and cracking.

Get ZNR Latex Specs >