Grouting concrete slabs is not always necessary and depends on where and how they are used. Here are the key facts: 1. Grouting is not mandatory:
In most cases, concrete slabs are laid with a so-called empty expansion joint between them, without the need for grout. This allows the raw, minimalist look of the concrete to be preserved.
Recommended for exposure to water:
If the slabs are installed on facades, in bathrooms or other places exposed to water and moisture, it is necessary to use a flexible grout to prevent moisture from penetrating under the slabs and weakening the adhesive.
Aesthetic requirements:
Grouting can also be done if the design or customer preferences require it. A well-chosen grout can be an additional decorative element.
2. Mandatory on facades:
Grouting is mandatory on external facades. Expansion joints protect the slabs from water ingress, which could lead to damage or loosening of the slabs under the influence of changing weather conditions. It also protects the adhesive from the adverse effects of UV rays, which can weaken its strength.
Important tip: Before installing the concrete slabs, it is recommended to paint the joints with black paint to visually hide the gaps between the slabs.