Screed Concrete – Properties and Proper Processing

Screed Concrete – Properties and Proper Processing

So-called screed concrete is a special and already premixed mortar that can be used universally both indoors and outdoors. Screed concrete has the property of becoming very solid after processing and is very easy to process. If necessary, you can even make it yourself if only small areas need to be processed.

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properties

Screed concrete has quite good properties. In addition to its many areas of application, it impresses with its easy processing and the fact that it is low-shrinkage. It is a cement-bound work material that has very good strength development and is weather and frost-resistant after it has dried out. It is a dry concrete or dry screed mortar that can be used both for the production of foundations and for the production of concrete components and simple screeds. Of course, this type of concrete can also be used as a floor for rooms in the basement, workshop, or garage. The building material is very popular because of its many good properties and is also cheap to buy.

Make the concrete yourself or buy it ready-made

Screed concrete can be made from just a few basic materials such as cement, a size 6 aggregate, and water. Of course, a concrete mixer is best for mixing the building material. The screed concrete is also available in various types in the hardware store ready for further processing. The advantage here is that it is extremely cheap (the material prices are around two euros for 40 kilos) and can be processed immediately.

preparation of building| pixabay.com

Preparation of the building material

If the screed concrete is produced in-house, the individual materials should be coordinated with one another as precisely as possible. This will later achieve better strength of the building material. There are various options for mixing the concrete. Probably the easiest thing to do is to borrow a cement mixer. This allows the building material to be mixed very easily, conveniently, and, above all, thoroughly. If this is not possible, a large plastic tub or possibly a plastic bucket can alternatively be used, for example, if a large amount of screed concrete is not required. The concrete is then mixed with a whisk attached to a drill. Alternatively, of course, a shovel can also be used to mix the raw materials. 

Here is a shortlist of the things needed to mix screed concrete:

  • Cement in the desired amount
  • 6 aggregate in the required amount
  • water
  • Concrete mixer or alternatively a plastic tub and whisk for the drill or, in the simplest case, a shovel
  • possibly also additives to improve the properties of the concrete

Straight edge and float as useful tools when processing the building material

Another tip: a so-called straightedge should be used to process the building material after it has been mixed. It is a universal tool that enables good work results. The straightedge is very suitable for smoothing the screed concrete after it has been applied. It also makes it possible to remove larger areas when plastering. A so-called float can also be useful, for example when plastering or laying screed concrete. With the help of a float, fatigue-free work is possible. Thanks to its special coating, the building material does not stick to the trowel.

Buy purchased screed concrete instead of making it yourself

It is certainly easiest to use purchased or delivered concrete. This is produced in a large concrete plant. All individual components are carefully calculated and put together so that the buyer receives a perfectly coordinated concrete mix. In this way, a better strength of the later concrete can often be achieved. When processing the building material, the buyer can also save a lot of time, as this is very easy to implement.

Process screed concrete

More tips for preparing the concrete

When processing the building material, it can make sense to first add a little more water to the mixture so that the screed concrete becomes more fluid. This makes it easier to distribute. However, a longer drying time should be planned for this. Important: Screed concrete should not be processed at temperatures of less than 5 ° Celsius that are too low. Processing in the rain, strong wind, or in direct sunlight should also be avoided if possible. The prepared substrate must be sufficiently pre-moistened.

This is how the finished screed concrete is processed

  • The substructure for the screed concrete should be as dry as possible and of course free from dirt. There must also be no cracks or subsidence, as these can have a negative effect on the subsequent floor covering. Loose concrete or mortar residues should, if possible, be removed with suitable tools before the concrete is applied.
  • Before applying the concrete, the primer should be applied according to the manufacturer’s instructions. Among other things, it ensures that the pores of the substrate used are closed.
  • If the floor is sensitive to moisture, an epoxy resin primer should also be used.
  • This is followed by the processing of the screed concrete. This is applied as evenly as possible to the corresponding substrate.

Use reinforcement grids for screed concrete

Under certain circumstances, it may be necessary to use so-called reinforcement grids, for example when stiffening is necessary. Such stiffening should be used when inflexible materials such as tiles or natural stones are to be laid.

Reinforcement grids are nothing more than simple wire grids. They are intended to give the screed concrete additional stability and are embedded in the upper third of the screed. A distinction is made between different sizes of the reinforcement mesh. Various mesh sizes and wire sizes are also available for the grids. The wire used for a reinforcement mesh has special strength properties. There are both bare and galvanized screed grids. As an alternative to a screed grid or reinforcement grid, so-called fiber reinforcement can also be used. Instead of a wire, special fibers are applied to the flowing screed. The fiber reinforcement is a little more expensive than a conventional reinforcement mesh, but it is much easier to process.

Further information on processing screed concrete

  • If a floating screed is to be produced, the concrete layer should be at least three and a half centimeters thick.
  • If the screed floor is to be designed as a so-called heated screed, only half of the water is used. Instead of the remaining water, a special adhesive emulsion is used.
  • After mixing, the screed concrete should be processed as soon as possible. Only lump-free concrete must be used.
  • It is essential to protect your eyes while processing the building material. Direct skin contact with the building material should also be avoided if possible. If it comes into contact with the skin, it is essential to rinse with plenty of water. In the event of contact with the eyes, an ophthalmologist should be consulted immediately.

Prices

When buying screed concrete, you must not be confused. Often this is also offered as “concrete screed”. In this overview, we present some products and their respective prices. The prices vary between € 1.15 to € 5.49 for 10 kg of screed concrete. The more screed concrete you buy, the cheaper it will be. You can buy a 40 kg package for € 5.99 (approx. 15 cents per 1 kg).

productPackingprice
Baumit screed concrete10 kg€ 3.75
Benz Professional concrete screed30 kg€ 3.95
Toom screed concrete40 kg€ 4.49
quick-mix screed concrete10 kg€ 5.49
Saint-Gobain Weber concrete / screed10 kg€ 5.49
Sakret concrete screed40 kg€ 5.99