Laitance is the weak, powdery, chalky layer of cement dust, lime and sands which appear on the surface of concrete. There are many reasons for this laitance including too much water within the concrete mix, rain damage or unsatisfactory curing.
Laitance should be removed during the preparation process for any resin floor system otherwise floor failure and mass delamination can occur. This can be achieved through course diamond grinding or totally enclosed shot-blasting.
During correct floor preparation, all cementitious laitance must be removed to expose a sound screed and provide a dry, dust free, open textured surface. All hard to reach areas and areas around the perimeter should be prepared using hand held preparation equipment, ensuring that all areas are correctly prepared and ready for the resin system.
This preparation process removes laitance and other contaminants and allows the resin floor coating to correctly bond to the substrate.
To find out more about the importance of floor preparation, watch Tony’s Top Tips – Get the Right Result