Bonding MaxBerg Long tiles on mineral wool

Bonding clinker façade tiles or concrete tiles to a wall insulated with mineral wool requires special attention due to the nature of the substrate, which is vapour-permeable and requires proper preparation and the use of the right materials. Below are technical specifications and recommendations based on available information.

How to prepare the substrate for installing facade tiles?

Condition of the substrate: The wall surface must be even, solid, dry and cleaned of dust, dirt, grease and mortar residues. Unevenness greater than 1 cm must be levelled with levelling mortar.
Mineral wool insulation: Mineral wool (e.g. ISOVER Fasoterm 35 or FRONTROCK PREMIUM boards) is vapour-permeable, which allows the wall to “breathe”, but requires a suitable fixing system to avoid dampness. Another dedicated stone wool insulation material is FRONTROCK L lamella boards. FRONTROCK L is a non-combustible thermal insulation in jointless thermal insulation composite systems(ETICS)
Reinforcement and studding: Use a glass fibre reinforcement mesh embedded in adhesive mortar on the mineral wool layer and additional fixing dowels with a metal pin (recommended 6-8 pcs/m², more in corners). The anchoring depth of the dowels is at least 5 cm for reinforced concrete walls or 8 cm for walls made of cellular concrete, ceramic blocks or silicate.
Priming: Before bonding the tiles, the surface should be primed to increase adhesion. In the case of mineral wool, it is particularly important to use a primer dedicated to mineral substrates.

Choosing the adhesive for installing facade tiles on mineral wool

Type of adhesive: Use a flexible, frost-resistant cementitious adhesive, preferably of class C2S1 or C2S2 dedicated to clinker or concrete tiles, such as KERAFLEX EXTRA S1 by Mapei. The adhesive should be resistant to temperatures from -30°C to +90°C and have an extended open drying time (min. 30-45 minutes). Quick-mix brand chemistry provides comprehensive chemistry solutions dedicated to both substrate preparation for tile bonding and direct installation.
Method of adhesive application: The ‘wet-on-wet’ double spreading method is used, i.e. applying the adhesive to both the wall and the underside of the tiles, using a toothed trowel (teeth 8-10 mm). The adhesive layer should be no thicker than recommended by the manufacturer (usually 4-6 mm). The entire space under the tile must be filled with adhesive to prevent water penetration.
Notes: The adhesive must be compatible with mineral wool and be moisture resistant to prevent the tiles from separating due to condensation in the insulation layer.

What should you pay attention to when installing facade tiles?

Laying technique: Tiles are laid from corners and window/door openings, using string or spacer profiles to ensure even joints (recommended joint width: 8-15 mm). In the corners, it is advisable to use special angle tiles for aesthetics and ease of installation.
Grouting: The joints are filled with a flexible, frost-resistant grout dedicated to concrete tiles that is resistant to moisture and temperature changes. The grout should be vapour permeable. Grouting can be started after the adhesive has set (usually after 24-48 hours).
Expansion joints: On large areas (every 12-16 m²) and in areas of substrate changes or construction joints, expansion joints should be made, filled with a permanently elastic compound (e.g. silicone).

Mineral wool, what should you pay attention to?

Mineral wool is a vapour-permeable material, which can lead to condensation in the insulation layer if adequate ventilation is not provided. For this reason, some manufacturers recommend avoiding direct bonding of tiles on wool, suggesting the use of an aluminium grid and a ventilated façade system.
In the case of direct bonding on wool, it is necessary to provide a tight reinforcement layer and proper studding to minimise the risk of tile spalling and to use vapour-permeable joints.
Dedicated systems, such as ArtBrick, offer specially prepared mineral wool boards integrated into the clinker cladding for easy installation and increased durability.

Technical parameters for materials

Mineral wool: Recommended boards with thermal conductivity λD ≤ 0.035 W/mK (e.g. ISOVER Fasoterm 35) and reaction to fire class A1 (non-combustible).
Clinker/concrete tiles: The water absorption of clinker tiles should be low (up to 6% for clinker, up to 20% for façade tiles). Concrete tiles can be heavier, requiring additional reinforcement of the fixing system.
Fixing pins: Metal pins, min. 4-6 pcs/m², depending on load and building height (up to 25 m for wool).

MaxBerg recommendations: which system to choose?

ETICS system (light-wet): The most popular method in Poland, consisting of gluing mineral wool to the wall, reinforcing with mesh and gluing tiles. Recommended for buildings up to 25 m in height.
Quick-mix brand chemistry provides comprehensive chemistry solutions dedicated to both substrate preparation for tile bonding and direct installation.

Choosing materials for the perfect facade

Mineral wool: lamella boards (e.g. ISOVER Fasoterm 35 or ROCKWOOL FRONTROCK PREMIUM) with high vapour permeability and elasticity for easy adaptation to unevenness.
FRONTROCK L is a non-combustible thermal insulation in seamless insulation systems(ETICS), used for external masonry, monolithic, prefabricated walls. Also for ceilings on the side of cold rooms, e.g. passageways, car parks.
Adhesive: Flexible cementitious mortars, e.g. KERAFLEX EXTRA S1 (Mapei) or others of class C2S1/C2S2, frost and moisture resistant.
Quick-mix brand chemistry
Long façade tiles from MaxBerg Long with high mechanical strength.
Format: 50cm long / 4cm wide / 2cm thick
Long is a combination of rawness and subtle sculptural texture.
Wave is the Subtle Sculpture of Light and Shadow.
Lunar is the Texture of Earth and Space.
Riff is a decorated surface with a fine groove giving a unique effect of subtle geometry and expressive texture.

Practical tips for installing facade tiles

Start gluing from corners and openings, using angle tiles for aesthetics.
Use starter strips and spacer profiles to ensure even joints and stability.
Mix tiles from different packs to avoid colour differences.
After grouting, clean the surface of the tiles with a special brush and wait 2-3 days for the materials to fully set.
Regularly check the plumbness and level of the tiles you are laying with a string or spirit level.

What to pay attention to for a durable facade?

Mineral wool is non-combustible and provides excellent acoustic and thermal insulation, but requires protection from moisture. It is therefore crucial to use a vapour barrier film on the inside and to ensure ventilation in the system.
For large facade areas or dark tiles (e.g. graphite), include expansion joints to prevent tiles from cracking under thermal stress.
Regularly check the condition of the façade after completion to detect any micro-cracks or efflorescence in the joints.

Alternative facade insulation layers

If you are concerned about moisture problems with mineral wool, consider using polystyrene as an insulation layer, which has a higher diffusion resistance and better prevents condensation under the tiles. However, wool is more environmentally friendly and non-combustible, making it a better choice in many cases.

Let’s summarize how to install clinker and concrete tiles on mineral wool.

Bonding MaxBerg long façade tiles to a wall insulated with mineral wool is possible, but requires precise preparation of the substrate, the use of a flexible, frost-resistant adhesive and a suitable reinforcement and studding system. The ETICS system is the most commonly used. It is crucial to follow manufacturers’ recommendations and building standards to ensure the aesthetics and durability of the façade for decades. If you need detailed information on specific products or assistance with material selection, let us know!

The above information on bonding clinker or concrete long tiles to a wall insulated with mineral wool is general in nature and should be directly agreed with the manufacturers of the listed building materials. We recommend consulting the suppliers of mineral wool, adhesives, grouts and tiles to confirm the compatibility of technical specifications, the selection of suitable products and to follow the detailed installation guidelines for your specific projWhat to pay attention to for a durable facade?