Capatect CS-Klebe- und Armierungsmörtel 850

Lightweight, mineral based dry mortar.
For bonding and reinforcing of thermal insulation boards.

LV Texte

Field of Application

Mineral dry mortar as adhesive and for lightweight reinforcing layers within the Capatect ETICS System A (silicate foam "Capatect-CS-Fassadendämmplatte") and for lightweight reinforcing layers within the Capatect ETICS System B (phenolic foam "Capatect-PF-Fassadendämmplatte 122"). To be applied in combination with textured renderings "Capatect-CS-Strukturputze".
ETICS = External Thermal Insulation Composite System.
   Brit. Term EWI = External Wall Insulation
   Am. term: EIFS = External Insulation and Finish System

Material Properties

  • Low material consumption.
  • Easy to apply due to light aggregates.
  • Weather-resistant.
  • Highly water vapour permeable.
  • Excellent adhesion.
  • High adhesive power on nearly all types of substrates.
  • Elastic due to fibre-reinforcement.

Packaging/Package Size

25 kg bag


Off white


Cool and dry, but frost-free. Protect from direct sunlight.
Completely empty containers and silos before longer downtimes (winter break).
Shelf life of the original, tightly closed bag: approx. 12 months.

Diffusion-equivalent air layer thickness sdH2O

sd < 0.04 m as per DIN EN 7783  
(5 mm layer thickness)

Apparent density of hardened mortar

approx. 1.0 g/cm3

Vehicle / Binding agent

Mineral binder as per DIN 1060 and
DIN 1164

Capillary water absorption

w= approx. 0.12 kg/(m2 · h0,5) as per 
DIN EN 1062

Supplementary Product

  • Capatect-CS-Fassadendämmplatte 800
  • Capatect-CS-Haftgrund 820
  • Capatect-CS-Strukturputze 860 + 870
  • Capatect-PF-Fassadendämplatte 122

Product No.


Suitable Substrates

Dry, solid  and sound masonry wall and concrete with or without mineral plaster.

Substrate Preparation

For use as adhesive:
Masonry, concrete or mineral plasters must be dry, clean, sound and free from all material that may prevent good adhesion. Remove mortar burrs and damaged, flaking existing coatings and textured coatings as far as possible. Cut off cavities, then fill them flush with the surface.
Thoroughly clean highly absorbent, sanding or chalking surfaces down to the solid material, then prime with Sylitol-Konzentrat 111.

For use as reinforcement mortar:
Foam-silicate insulation boards: First grind off existing offsets at the joints of the  foam-silicate insulation boards . Remove adhering grinding dust.
Phenolic boards: Avoid destruction of the surface.

Preparation of Material

Add the contents of a 25 kg bag of Capatect 850 gradually into 9 - 10 l of tap (potable) water  and mix carefully with a low-speed electrical paddle (agitator) until the mixture is free of lumps.
Do not prepare more mortar than can be processed within two hours. Already hardened material can not be made applicable by adding water.

Method of Application

As adhesive mortar: Apply freshly prepared mortar Capatect 850 on the complete surface of the insulation board using a square-notched trowel or apply several strips of material along the sides and the center of the surface, covering at least 70 % of the surface. Adjust the amount of adhesive and the layer thickness according to substrate tolerances. Substrate irregularities up to ± 1 cm can be compensated.
Install insulation boards line by line from the bottom to the top with horizontal interlocking. Apply boards edge to edge with slight pressure without knocking. Avoid adhesive within the panel joints. Pay special attention to install the boards with flat and perpendicular surface.
Note: Capatect-CS-Klebe- und Armierungsmörtel 850 is not suitable for bonding Capatect-PF-Fassadendämmplatte 122.

As reinforcement layer: Place  the corner protection profiles on window frames and edges, as well as the diagonal reinforcement fabrics on the corners of facade openings. Apply the Capatect 850reinforcement material in width of the fabric strips on the insulation boards and press in the Capatect-Gewebe 650, leaving about 10 cm of overlap.
Apply the reinforcement material wet on wet, ensuring a complete covering of the fabric. Total layer thickness: 5-7 mm.


Bonding of thermal insulation boards: Approx. 4-5 kg/m2 on planar substrates
Reinforcement layer:Min. 5.5 kg/m2 at a minimum coat thickness of 5mm.
Reference value without account of spilling, loss or individual conditions on site. The exact rate of consumption is best established by a trial application.

Application Conditions

Processing temperature: +5 °C to + 30 °C during application and curing for material, substrate and ambient air.
Do not apply on sun heated substrates (direct sunlight), during strong wind, fog, rain, high relative humidity or imminent rain and frost.

Drying/Drying Time

Adhesive: Cured and ready for stress after 1-2 days. Start setting anchors after the adhesive bed has sufficiently cured - approx. after 1 day.
Reinforcement layer: Wait at least 48 hours before applying any further coatings (depending on temperature and relative humidity).

Tool Cleaning

Immediately after use with water.


If necessary, cover the scaffoldings with tarpaulins to protect the surface from rain during the drying phase. Follow national or local regulations and specifications for application of mineral based mortars.

Special Risks (Hazard Note) / Safety Advice (Status as at Date of Publication)

Causes skin irritation. Causes serious eye damage. May cause respiratory irritation.
Do not breathe dust or mist. Do not get in eyes, on skin, or on clothing.
Use personal protective equipment as required.
IF IN EYES: Rinse cautiously with water for several minutes. Remove contact
lenses, if present and easy to do. Continue rinsing.
IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.
Get medical advice/attention.

Contains cement.


Materials and all related packaging must be disposed of in a safe way in accordance with the full requirements of the local authorities.Particular attention should be made to removing wastage from site in compliance with standard construction site procedures.
Germany/EC: Only completely empty packaging should be handed in for recycling.
Dispose hardened material as mixed building and demolition waste.
European Waste Code (EWC) 17 09 04


ZP1 (Germany)

Further Details

See Material Safety Data Sheet (MSDS).

Customer Service Centre

Tel.: +49 6154 71-71710
Fax: +49 6154 71-71711

International Distribution: Please see