Description and use of Knauf tile adhesive, technical characteristics and consumption
When laying facing material, the question always arises of the correct choice of glue. The material, tile dimensions, surface characteristics and subsequent operating conditions must be considered. The use of Knauf tile adhesive is possible for finishing work both outside and inside the building, while the base can be concrete, drywall, brick, plaster, screed cement-sand and other surfaces.
Description and purpose
Knauf glue is a dry mix of German production (Knauf company), after dilution - a high-quality glue solution. Used for laying tiles, porcelain stoneware, mosaics and other facing and insulation materials. Sold in packs of 25 and 10 kg.
Composition and properties
Knauf glue is based on cement and fine sand. To improve the technical characteristics, a certain amount of additives, polymers, antiseptic and anti-mold components are added.The main properties of the mixture: strong adhesion (adhesive force) on various substrates, resistance to temperature extremes, low consumption.
Features
The general technical characteristics of Knauf glue are as follows:
- temperature during work from 5 to 25C;
- the degree of adhesion to concrete - from 0.5 MPa;
- temperature for further operation - from -45C to 80C;
- shelf life - from 45 minutes to 2.5 hours (depending on the type of glue);
- drying time - 48 hours, before an increase in mechanical stress - a week;
- the period of possible correction of the tile overlay - 10 minutes;
- the recommended thickness of the adhesive layer is 2-6 mm;
- frost resistance - up to 45-50 cycles;
- shelf life - 1 year.
Main advantages
Clay Knauf has several undeniable assets.
Plastic
Due to its plasticity, the composition can be used on surfaces with small defects, as it will evenly fill problem areas. In this case, it is not necessary to pre-soak the tiles in water. The elastic structure of Knauf allows it not to collapse for a long time.
Frost resistance
High frost resistance allows Knauf to be used for outdoor work. During temperature changes, the seam retains its characteristics, remains intact.
Strength
The glue does not slip off the surface, it allows to hold even heavy facing materials. At the same time, it is important to observe the temperature specified in the characteristics of the mixture during operation and subsequent operation.
Moisture resistant
Moisture resistance allows Knauf to be used in bathrooms, kitchens and other rooms with high humidity levels.
Good mortar adhesion
Knauf glue has good adhesion to substrates.However, since Knauf hardens quickly, it cannot be applied to large areas at once, since when laying facing materials on a glue that begins to dry, the quality of the link will be reduced.
Waterproofing
By waterproofing the base, the adhesive layer protects the surface from mold and bacteria.
Ease of use
Working with Knauf glue does not require special training. It is enough to strictly follow the instructions written on the packaging. Thanks to the fluidity of the composition, its inherent self-leveling effect, gluing tiles on walls and floors is not difficult.
Varieties
Knauf is available in several types, each of which has its own technical characteristics that distinguish it from the others. To obtain quality siding, before choosing a composition, it is necessary to study the characteristics of each variety of glue.
Universal flizen
Recommended for work inside and outside the building. The shelf life after preparation is about 3 hours. For 1m2, 2.2-2.9 kg of Flisen are needed. Apply in a thin layer. Adhesion - 0.5 MPa. Recommended for porous, moisture-absorbing ceramics. Not suitable for porcelain stoneware slabs, as they have low water absorption and a low porous structure.
Flizen Plus with reinforced formula
This composition has increased frost resistance. Indispensable for interior and exterior decoration using porcelain stoneware, ceramic tiles, natural stone. Not applicable for underfloor heating. For 1 m² consumed from 1.7 to 2.2 kg (reduced consumption) depending on the type of surface, which must be leveled, dried and cleaned before laying.It differs from the universal Flizen in a wide range of facing materials, since it allows working with low porosity.
Due to the elasticity of the composition, it is allowed to apply a thin layer of glue, which does not affect its adhesion to concrete (also 0.5 MPa).
Flizen Flex
It differs from universal Flisen in increased adhesion to concrete (1MPa) and elasticity, as it contains certain additives. Used for natural stone, porcelain stoneware, suitable for porous tiles. It is used for fixing expanded polystyrene, mineral wool and other insulating materials.
Flisen Flex is recommended for surfaces subject to high stress or temperature fluctuations. Suitable for industrial enterprises, as well as balconies, terraces, heated floors. It has proven itself when used on wood and particleboard. Thanks to the increased adhesion, it is possible to lay the tiles on other tiles.
Flizen Marble
Fast curing adhesive containing cement, mineral filler, polymer additives. The shelf life of the prepared mixture is 45 minutes. It has a white tint, which allows it to be used for glass tiles, translucent ceramics, glass mosaics. The color of the glue protects the facing material from fading. Also suitable for coating granite, marble and other stone slabs.
Flisen marble is suitable for exterior and interior decoration of all standard flat substrates. It is used for balconies, terraces, underfloor heating and other surfaces subject to temperature variations. It is used for laying tiles on floors with a high load, in this case it is also applied to tiles.
Fliesen max
Thick-bed mortar used in cases where increased strength of masonry is important. It is applied in a layer up to 3 cm, allows, in parallel with the coating, to achieve the effect of leveling the floor and walls. Not suitable for hot floors.
Application rules
It is important to observe the temperature ranges during operation. You will need a trowel and a notched trowel for gluing.
Preparatory work
Before you start coating, you need:
- cleaning of dust, dirt, old finishing materials, paint;
- degreasing with solvents;
- surface drying;
- when facing a hot floor, turn it off a day before work;
- priming highly absorbent substrates;
- prevention of contact with water, providing the necessary waterproofing.
Breeding rules
When thinning the adhesive, use eye protection and a respirator. Knauf is diluted in the following proportion: 1 kg of dry glue requires 1 glass of water. First, the liquid is poured, after which the powder is added, the mass is kneaded with a construction mixer until a homogeneous solution is obtained. The finished mixture is covered with a lid for 5 minutes, then mixed again.
How to work with glue
Take the glue with a trowel and put it on the spatula. Apply to the wall or floor, spread the adhesive evenly over the surface, then rub over the adhesive layer with the teeth of the trowel. For exterior work, also apply the glue to the tiles. After that, fix the facing material, press it tightly to the base. Immediately wipe off the protruding adhesive layer with a damp cloth.When working with glue, avoid direct sunlight and drafts.It is necessary to carry out work with gloves.
How to calculate consumption
The consumption of adhesive will depend on the height of the notches of the trowel, the dimensions of the tiles and the quality of the preparation of the support. It is roughly calculated as follows:
- tiles less than 10 cm (trowel with a notch height of 4 mm) - 1.7 kg / m2;
- tiles 10-20 cm (trowel with a notch height of 6 mm) - 2.2 kg / m2;
- tiles over 20 cm (trowel with a notch height of 8 mm) - 2.9 kg/m2.