Basics of Tile Grouting
This process is especially important in high-humidity areas, such as bathrooms or kitchens. Grout seals the spaces between tiles, preventing water from seeping under the surface, which could cause mold growth and damage. In addition, grout helps prevent the accumulation of bacteria and other contaminants between the tiles.
Key Stages of Tile Grouting
Before starting, it is recommended to clean the tiled surface— a damp sponge works perfectly for this. Next, prepare the chosen grout according to the instructions on the product packaging.
The next step is to apply the prepared grout onto the surface using a grout float. It is best to fill the joints with diagonal movements. When the grout has mostly set but is still slightly damp, the “washing” stage begins, also using a damp sponge. Circular motions help shape the depth of the joint.
Afterwards, allow the grout to dry (drying time depends on the specific product). Later, any remaining cement residue can be removed from the surface using a special grout sponge with gentle rubbing, followed by wiping the surface with a cloth for final cleaning.
Classification and Labeling of Materials
The classification and labeling of grouting materials are carried out according to standards, which is important for choosing the right product.
European Standard (EN 13888):
The classification and categorization of grout materials follow EN 13888. The product packaging and technical datasheet always indicate the product marking.
The marking includes letters and numerical codes that help navigate among different materials.
Marking codes:
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By binder type:
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CG – cement-based grout
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RG – reactive synthetic resin-based grout (usually epoxy)
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By performance:
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Standard strength grout
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High-strength grout
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Additional characteristics:
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W – reduced water absorption
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A – high wear resistance
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The standard does not cover the following features, which are provided only by the manufacturer:
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Method and area of application (e.g., interior or exterior use)
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Antibacterial, antifungal, and anti-algae properties of the grout.
Grout Calculation: Determining the Required Amount of Material
This formula can be used to calculate the required amount of grout. Due to the specifics of the work and differences in tile sizes, the result will be approximate.
(A+B)A×B×C×D×F=kg/m²\frac{(A + B)}{A \times B} \times C \times D \times F = \text{kg/m²}A×B(A+B)×C×D×F=kg/m²
Where:
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A = tile width (mm)
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B = tile length (mm)
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C = tile thickness (mm)
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D = joint width (mm)
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F = material consumption rate (kg/dm³)
Innovations by Cemix in the Field of Tile Grouting
Joints are the least durable part of rooms with tile coverings. It often happens that a surface which was flawless on the day of completion changes color over time, starts to crack, or becomes affected by mold under heavy use or exposure to aggressive environments. Cemix specialists are constantly seeking innovative solutions to these problems.