what is it needed for? Description + Video & Photo

what is it needed for? Description + Video & Photo Plasticizer for underfloor heating screed: what is it for, description

When installing an internal heating system, the most important point is precisely a high-quality screed, which in the future will become the basis for the finishing coat. The reliability and durability of the heating system will depend on its solidity and level of strength. For this reason, it is important what material will be used. If until recently a sand-cement mixture was used for this, at the moment, thanks to the latest technologies, special components and additives have been developed.

So, the most effective component is a plasticizer for screed warm water floors, which makes it possible to create a coherent and strong base.

Brief description

The better and better the cement layer, the more efficient room heating will be. When pouring underfloor heating, you need good quality concrete, and this is difficult to achieve without using a plasticizer for the screed. The used sand-cement mixture does not have all the necessary technical and operational characteristics to ensure a truly effective floor heating operation. The very construction of underfloor heating is characterized by temperature differences in the cement layer, which sooner or later will provoke a violation of integrity, the appearance of microcracks. In addition to the destruction of the concrete itself, the finishing flooring ( decorative stone, tiles, etc.

) is also deformed, and sometimes even disturbances in the performance of the heat source appear, not to mention the fact that it is very difficult to obtain complete solidity of the poured layer from a standard solution.

If during the laying of the mixture air pockets are formed, this entails a decrease in the functionality of the floor heating system as a whole. A plasticizer for the floor can be bought at any hardware store, and this is the right choice, since it will make the concrete mix better, more homogeneous, and this will have a beneficial effect on the pouring.

The mixture becomes plastic, and due to the universal composition it receives additional pleasant properties:

  • Increased performance characteristics.
  • Waterproofing.

  • High adhesion rates (this is the ability to bond with different materials).

Material composition

Plasticizers used for floor screed have different components in their composition, and some of the manufacturers even try to hide some of the components to create unique product.

But at the same time there is a list of the main components that are used almost always:

  • what is it needed for? Description + Video & Photo Waste purified material from phenol.
  • Concentrated sulfuric acid.
  • Composite (formalin).

  • Purified water.
  • Substances that help to remove foam.
  • Caustic soda in liquid form.

Due to this composition, it is possible to achieve the required homogeneity of concrete, as well as to avoid the formation of air pockets inside the floor during pouring. The screed for a warm electric floor does not at all allow any cracks, air voids and gaps.

Such costs of a concrete screed can lead to the fact that in empty areas the cable will start to overheat and the system may suffer due to a short circuit. If you plan to lay an electric cable floor, then use a plasticizer MANDATORY!

Advantages and disadvantages

Like any other consumable, plasticizer for underfloor heating screed, the price of which will largely depend on the quality of the product and the manufacturing company, has its own advantages and disadvantages.

Advantages :

  1. The floor surface becomes denser, becomes waterproof, and this is important when installing and using underfloor heating in the future.
  2. Due to this additive, it is possible to achieve high values ​​of the mechanical strength of the concrete pour. Even after several decades, the concrete base will still be the same monolithic and high strength.

  3. Saving consumables. Thanks to the use of a suspension, it turns out to reduce the laying of a cement base by 15%, while this does not affect the characteristics, especially strength.
  4. The composite is pliable and mobile, which, when filling the screed, will help to ensure solidity without any air pockets and voids.
  5. Certain types of plasticizers (which are more expensive than conventional ones) help protect the metal mesh from corrosion. Thus, both fittings and metal elements of the floor heating system will not be damaged.

  6. The main advantage is the high rate of exploitation of the prepared mixture - you have the opportunity to prepare a sufficient amount of the mixture in advance and not be afraid of hardening before you finish the filling work.
  7. The plasticizer helps to neutralize the effect of a 5% -1 mixture of potassium nitrate, due to which salt will not appear on the concrete.

I would like to add that plasticizers do not have a pungent odor and retain their properties for a long time. They also do not emit any toxic substances, that is, the product is completely ecological.

Disadvantages :

The only disadvantage of this composition is that it hardens for a very long time.

But you can still fix this by adding special hardening accelerators. Given this disadvantage, we do not recommend resorting to using such a component in cases where you do not have the opportunity to wait until everything hardens naturally, so that the surface is ready for the rest of the work, namely laying the finishing layer.

The problem of long curing can be easily solved - use a curing catalyst.Such additives as a modification, although they will increase the final cost of the screed, will allow it to quickly harden, while with this approach, the hardening time period will be even less than that of a cement-concrete mixture.

Procedure and method of application

First, let's talk about in what proportions the additive should be used.

It is released in the form of a liquid solution, but sometimes it is a powder, that is, a dry composition. Liquid composites should be mixed with the rest of the components, and then thoroughly mixed and added together with water while mixing. The mortar should be added from 1 to 1.5 liters per 100 kg of dry cement mixture. When using dry material, you should take one measure of powder for two measures of water, then mix well and leave for 2-3 hours.

When the specified time has elapsed, the resulting suspension can be introduced in a similar manner to the above-described principle. The use of a plasticizer for screed floor heating is carried out in several stages, so let's look at each one.

Stage # 1

The additive is introduced into the sand-concrete mixture or other solution that will be used for pouring the coating, and this is done simultaneously with the introduction of the remaining components ...

Then mix all ingredients thoroughly for about 1.5 hours. For this, it will be more convenient to use a concrete mixer, but if such an apparatus is not available, then you will have to mix all the components according to the standard method - a drill with a special attachment.

Stage # 2

what is it needed for? Description + Video & Photo Now you have a ready-made composition. You can use it to fill surfaces for any purpose - in industrial openings, for hidden heating systems, and more.

An important point is that during use it is required to evenly distribute the mixture over the entire surface. It is on this that the final quality and reliability of the base will depend.

Step # 3

The next step is to create a grout layer to ensure complete curing. If the room does not have a high level of humidity, but after a week the surface will be ready for the rest of the work, namely, laying a decorative coating layer. After 14 days in this room, it will already be possible to arrange furniture and not worry that the screed may deform.


Let's take a closer look at the types of plasticizers for water floor screed:

  • Liquid.
  • Dry.
  • Antifreeze additive.
  • Reinforcing polyamide fiber.

Each of these types of substances helps to speed up the hardening process and makes the solution more plastic.

Antifreeze additive makes it possible to work with concrete even at negative temperatures. The choice of plasticizer should be based on the floor heating system, as well as the installation method. This is important for a water floor, since the screed must necessarily tightly fit the pipes. These are possibilities only with an elastic solution.The plasticizer will help to ensure that the screed is homogeneous without air gaps - this will help to make it durable.

Such a screed can withstand heavy loads, and this is important for floor heating pipes, because if the floor is damaged, there is a danger of damage to the pipes. For this reason, the screed should be at least 2.5 cm.

When creating an electric floor heating system, it is a dry mixture that is used under the tiles, and adhesives are added for better elasticity and strength. The price for a plasticizer will be the same or even slightly less than that of high quality cement.

Also, the cost will be affected by consumption and characteristics. Typically, 600 to 1000 ml of plasticizer are used per meter 2 mixture. If you buy a cheap composition, the consumption will be higher, so you will hardly be able to save. It is better to purchase quality materials, as this is a guarantee of reliability, and the period of use will be much longer.

On the construction market there is a huge number of brands of plasticizers for sand-cement and other similar mortars.

They can be bought on the market, in special stores, and on the Internet.

The best plasticizers

In the modern construction market there is a wide variety of ready-made mixtures, but we will only tell you about the best.

It is interesting that these are the best compositions, especially in terms of price-quality ratio:

  1. Sa nro l. It is a liquid formulation that helps to achieve high strength and ductility even when frozen. The addition helps to reduce the amount of water for mixing to about 20% and the plasticizer should be added at 100 ml per 200 kg of cement.

    A special advantage of Sanpol is that even with the initial setting of the screed, you can even correct minor flaws.

  2. The same properties as the plasticizer for underfloor heating screed Sanpol apply to all products from the company " Thermoplast ", and there is only one difference - you need to use a liter of plasticizer for every 100 kg of cement. It can be poured at any temperature, from -27 to +55 degrees. The material is of high quality, can only be used in tandem with high-quality concrete. The composition greatly increases the strength of the finished surface and helps to eliminate any air pockets during solidification.

  3. RENA U. This is a premium product with excellent performance. For a thin screed, this will be an ideal option, there are simply no competitors for such a composition. Add 100 ml to the solution for every 100 kg of cement.

In the end, I would like to note that the use of such compositions greatly simplifies the installation of the internal heating system, and this helps to make it as safe and reliable as possible, which is already important.