Ceresit CT 85 - plaster and adhesive mixture for expanded polystyrene: characteristics, consumption

The glue mixture Ceresit CT 85 is acomposition for fixing expanded polystyrene plates and further forming a reinforced protective layer on them. In the latter case we are talking about works in which there is a need to establish a system of exterior thermal insulation of external walls of the "wet method" technology.

Main characteristics

Ceresit CT 85 has a lot of advantages, amongwhich can be distinguished by a high ability to adhere with expanded polystyrene and mineral bases, elasticity, vapor permeability, weather resistance, and environmental safety. The composition contains reinforcing fibers, the mixture is shockproof, frost-proof and technologically. In order for the composition to show all its positive characteristics, sometimes it is necessary to additionally prepare the surface, which must be degreased and cleaned from foreign objects, preventing the reinforcement of the insulation plate as precisely as possible to obtain the ideal surface suitable for decorating the wall.

Scope of use

Ceresit CT 85 has a rather wideThis is the reason why consumers acquire this composition, refusing alternative solutions. This adhesive can be used to fix plates that are made of expanded polystyrene. Their fixation is very effective. The mixture is suitable for the production of reinforcing layers on such slabs, when the facade is formed by "wet" technology. This mixture can be used for insulation of new buildings or thermal protection of old buildings. When warming facades of buildings in a "wet" way with the use of mineral wool slabs, this glue is also used.

Specifications

Ceresit CT 85 is a mixture ofmineral aggregates and cement, reinforcing microfibers and polymer modifiers. The density of the dry mixture varies within 1.3 kilograms per cubic decimeter. At 25 kilograms of the dry mixture, approximately 6.75 liters of water will be needed to make the solution. After preparation, the composition should be consumed within 120 minutes, while the temperature should be kept from +5 to +30 degrees. Operating temperature varies from -50 to +70 degrees.

Quite often builders are interested in thischaracteristic, as adhesion to expanded polystyrene. So, it is equal to 0.1 MPa. As for the adhesion to concrete, it is 0.6 MPa or more. Glue "Ceresite" is able to undergo about 75 cycles of freezing and thawing. If you plan to form a layer, the thickness of which will not exceed 8 millimeters, then in 28 days all cracks will be absent. It is very important to take into account what Ceresit glue consumes. If necessary, fix the plates or form a protective layer, the flow rate will be 6 and 5 kilograms per square meter, respectively.

Preparation of the substrate before installation of expanded polystyrene plates

If you decide to use the composition of Ceresit CT 85,the characteristics of which have been described in detail above, then you should become more familiar with the technology of preparation of the base for the installation of slabs. The surface must be as strong as possible, free of dirt and foreign matter, which would be able to reduce the adhesion of the adhesive to the substrate. This includes lubricants, paintwork, oil, grease and bitumen mastic. If there are fragile areas on the surface, then you need to get rid of them.

In the presence of depressions, which in sizeexceed 20 millimeters, cavities should be filled with Ceresit CT 29 material, and this must be done three days before the beginning of the insulation work. Ceresit CT 85, the flow rate of which was mentioned above, should be applied to a surface completely cleaned of contaminants. To get rid of them it is possible a stream of water supplied under high pressure. Coping with such work can also be done with a solvent or mechanically.

If the fixing of expanded polystyrene platesis carried out on plaster, oily or synthetic coatings, then in the preparation of a dry mixture it is necessary to use the adhesion additive Ceresit CC 81, which is diluted with water in a ratio of 1: 3. Thus, one part of the additive will require 3 parts of the liquid. If there are paint coatings on the surface, they must be ground and dust-free.

Additional recommendations for training

Ceresit CT 85 adhesive is appliedon a wall that is completely devoid of areas exposed to fungi, algae or mosses. Such surfaces are brushed and treated with the fungicidal preparation CT 99.

Those walls that were not plastered andare used for some time, it should be dust-free, rinsed with water under pressure. The walls are left to dry completely. Sometimes it is necessary to work with strongly absorbent bases. This should include the surface of aerated concrete or silicate blocks. They are primed and dried for 4 hours.

Recommendations for the construction of a protective layer

Sometimes it happens that after fixing the plateoverlaps remain in the open air for 2 weeks or more. Should not rush to cover the adhesive with a protective layer such a base, to start their visiting. If the surface has changed color, it appeared on the dust, the heat insulation material is processed coarse sandpaper and dedusted.

Application of composition

The glue "Ceresite" should be prepared exactly inaccording to the instruction. To do this, use cold water (its temperature should be in the range of +15 to +20 degrees). The mixture is added to the liquid and mixed, while obtaining a homogeneous mass. Stirring is effectively done with a mixer or drill with a nozzle. The speed of rotation of the working tool should not be more than 800 rpm. Then the master leaves the mixture for 5 minutes to "ripen", after it is stirred again.

Installation of plates from expanded polystyrene

As mentioned above, CeresitUsed for fixing expanded polystyrene plates. If the walls have irregularities from 3 to 15 millimeters, the composition is applied by the trowel along the contour of the plate. In this case, the adhesive strip should be equal to 4 centimeters in width. In the central part of the heater are placed beacons. The number of such spots on one canvas should be equal to 8. Their diameter is 10 centimeters. The adhesive band along the contour should be applied with breaks, which eliminates the formation of air bubbles. The height of such bands should be equal to 20 millimeters.

When the irregularities measure up to 3 millimeters,The glue is applied in a continuous layer, with the indentation being three centimeters from the edge. In doing so, use a notched trowel. Choose a tool whose tooth size is 12 millimeters. As soon as the plaster-glue mixture was applied, the slab is applied to the surface and pressed with graters. The area of ​​the adhesive contact after pressing the web should be 40 centimeters from the area of ​​the bonded surfaces.

Plates are fixed in one plane suchso that the seam dressing has a T-shape. It is important to ensure that the gap between the plates does not exceed 2 millimeters. Larger seams can be filled with polyurethane foams or cuts of expanded polystyrene. Glue "Ceresite" will dry completely after three days, only then you can proceed to additional fixation, if such a need exists. For this, the masters are advised to use facade dowels. After this period, the master can form a reinforced layer.

Formation of a protective layer

Begin these manipulations onlyafter additional fastening of a heater with dowels. Their number per one square meter of the facade surface should be determined by calculations. The plaster-glue mixture is spread by a steel float over the surface, while the thickness of the layer can vary from 2 to 3 millimeters. On the adhesive layer is laid a grid of alkali-resistant fiberglass. It is important to ensure overlapping of the canvas from 5 to 10 centimeters in width. Immediately you can start applying a second layer of glue, the thickness of which should be 3 millimeters. The surface can be smoothly smoothed out so that the grid can not be seen. On the protective layer after three days can be applied decorative coating of thin-layer plaster or alkali-resistant paint. From fresh residues of glue can get rid of water, while dried elements are removed mechanically.

For reference

Ceresit adhesive bonding canto be carried out at an air humidity that does not exceed 80%. All the parameters stated in the technical description are correct at an ambient temperature of +20 degrees. At the same time, the relative humidity should not exceed 60%. If the conditions are changed, the drying out of the material and the consumption time will be different. If there is a need to carry out work on the thermal insulation of the facade in the cool season, when the thermometer's column varies from 0 to +20 degrees, then the modification of the adhesive "Ceresit CT 85 Winter" should be additionally used.

Cost

Ceresit CT 85, whose price is 620 rubles. for a 25 kg bag, is delivered in pallets. Store the mixture can be no more than 12 months from the date of manufacture.