Ceresit CT87 White Adhesive (Primer and Reinforcing Mortar) is a high-quality 3 in 1 product which does not require priming before plaster’s application.

Ideal to install Expanded Polystyrene Boards (EPS), Kingspan K5 and Mineral Wool slabs as well as for applying a thin reinforced layer for thermal insulation of buildings.

Ceresit CT87 thanks to the use of specially selected combination of fibres (Fibre Force Technology), strengthens the resistance of insulation system to damage, cracks and scratches. 

The application of CT87 (colour, surface and organic modifiers) allows for omitting the substrate preparation process by priming with the priming paints before the application of any Ceresit plasters. 

The content of special light fillers gives more flexible, light and homogenous consistency, it is easier to be stirred, applied and spread, thus increasing the efficiency of the mortar.

CT87 should be poured into the measured amount of cool clean water and stirred with the drill by means of a mixer until the homogenous mass is obtained without lumps, wait approx. 5 minutes and mix again. 

The reinforcing layer should not be applied on highly insolated surfaces and the applied layer should be protected against rain. 

It is recommended to use scaffolding protection.

1. Fixing Thermal Insulation Boards:

The ready mortar should be applied with a trowel along the board edge forming a strip of 3÷4 cm wide and a few spots with the diameter of approx. 8 cm. 

Only in case of mineral wool boards, it is necessary to apply so called ‘’priming’’ with CT87 on the whole surface of the board with the use of a metal long float before the adhesive mortar is applied. 

Then immediately, the board should be pressed to the wall with a few slight blows a long float.

The properly applied mortar when pressed should cover minimum 40% of its surface. 

In case of even, smooth substrates the mortar should be applied by means of a toothed long float (teeth 10mm - 12 mm).

The boards should be fixed tightly one at the other in one surface with the preservation of ”brick like manner’’ of vertical connection.

2. Reinforcing Layer Application:

The ready mortar should be spread along the surface of the boards by means of a toothed long float with the size of the teeth 10-12 mm.

Only in case of mineral wool boards, it is necessary to apply so called ‘’priming’’ with CT 87. 

The glass fibre mesh should be applied on the fresh mortar, it should be immersed by means of a metal long float and filled smoothly.

The properly immersed glass fibre should not be visible, it should be completely immersed in the adhesive mortar. 

It is necessary to use the approximately 10cm overlaps of the next mesh belts. 

Possibility of mechanical application - Recommended type of machine e.g. Wagner PC 15, SPG Baumaschinen PG 20.

Assumed consumption:

 · Fixing of EPS-boards: approx. 4.0 kg/m2

 · Armoured layer (on EPS-boards): approx. 3.0 kg/m2

 · Fixing of Kingspan K5-boards: approx. 4.0 kg/m2

 · Armoured layer (on Kingspan K5-boards): approx. 3.0 kg/m2

 · Fixing of mineral wool boards: approx. 4.5 kg/m2

 · Armoured layer (on mineral wool): approx. 4.0 kg/m2

 · Putty layer: approx. 1.0 kg/m2

 · Approx. coverage 6m2 per bag

Key Points:

 · '2 in 1' product – does not require priming before plaster’s application

 · Strengthened with unique combination of fibres

 · Considerably lower consumption per m2

 · Resistant to hairlines and cracks

 · High adhesion to mineral substrates, EPS and mineral wool

 · Flexible and highly resistant to mechanical impacts

 · Highly vapour permeable

 · Low water absorption

 · Resistant to weather conditions

 · Possibility of machine application

Important:

Application should be performed in dry conditions with the substrate and ambient temperature from +5 °C to +25 °C. 

CT87 contains cement and causes alkali reaction when mixed with water.

Therefore skin and eyes should be protected. 

In case of contact with eyes, they should be rinsed with water and the general practitioner should be consulted.

*Further information may be found in our Downloads section.

Fairly easy access to all PDF files.

Datasheet ǀ Declaration of Performance - DoP ǀ BBA Certificate ǀ Installation Guide ǀ Certificates ǀ Brochure ǀ SPEC Sheet

non returnable bagged product.