Ceresit CT80 4-in-1 Adhesive & Base Coat Render is a high-performance cement-based mortar designed for fixing Mineral Wool (Rockwool) Insulation, EPS & XPS insulation boards and forming reinforced basecoat layers within Ceresit Ceretherm ETICS façade systems. Suitable for both internal and external applications, Ceresit CT80 provides excellent adhesion to mineral substrates and almost all types of insulation boards while delivering a durable and impact-resistant reinforced layer ready for decorative render finishes. Its versatile formulation allows it to be used as both an adhesive and basecoat, helping simplify façade system installation on residential, commercial, and refurbishment projects.

25kg bag of Ceresit CT80 typically covers the following:

EPS & XPS Insulation:
Upto 5m² as an adhesive
Upto 3m2 as a reinforced basecoat layer at 6mm thickness.

Mineral Wool Insulation: 
Upto 5m² as an adhesive
Upto 3m2 as a reinforced basecoat layer at 6mm thickness.

Key Features

• Dual-purpose formulation suitable for both insulation fixing and reinforced basecoat applications
• Suitable for use within Ceresit Ceretherm ETICS insulation systems
• Creates a durable and impact-resistant reinforced layer
• Suitable for internal and external use
• Weather-resistant and frost-resistant once cured
• Suitable for both hand and machine application
• Ideal for use within Ceresit Ceretherm ETICS insulation systems
• Available in a wide range of Colours of Nature® shades
• Approximate coverage as a reinforced basecoat layer: 3m² per 25kg bag
• Approximate coverage as an adhesive for insulation: 5m² per 25kg bag

Surface Preparation

Ceresit CT80 must be applied onto sound, dry, clean, and load-bearing substrates free from dust, grease, bitumen, oil, or other substances which may reduce adhesion.

Suitable substrates include:

• Concrete surfaces
• Traditional cement and lime-cement plasters
• Masonry substrates including brick and blockwork
• Existing mineral renders with good adhesion
• Expanded polystyrene (EPS) insulation boards
• XPS Insulation
• Mineral Wool (Rockwool) Insulation

Highly absorbent substrates should first be primed with Ceresit CT17 primer before application. Uneven or damaged substrates should be repaired and levelled prior to installation of insulation boards or reinforcement layers.

When used as a reinforced basecoat, alkali-resistant reinforcing mesh should be fully embedded within the mortar layer following ETICS system recommendations. Freshly applied material must be protected from rapid drying, rain, frost, and excessive heat during curing.