The minimum thickness of the floor screed. Dry screed floor. Calculation of the thickness of the floor screed

In the process of laying or repairing floor screed is the main point, because the upper flooring is laid on a perfectly flat plane. For quality ties, all you need is to calculate:

• Select the desired thickness.
• Variety of ties.
• The Composition of the solution.

The Primary must be defined maximum and minimum thickness of floor covering: directly from these characteristics depends on the stability and durability of the coating. A very thin layer can not provide the reliability you are targeting at, and very likely with a thick big load on the floor.

Conditions affecting the thickness of screed

The Minimum thickness of the screed is formed in each case individually, depending on:

• How is the styling.
• What materials are used for seals.
• Under what type of floor covering (linoleum, laminate and more) preparing the base.

Because the coupler can be formed as thermal insulation layer made of solid or bulk materials, and concrete surfaces.

The Thickness of the screed also depends on the flatness of the base, respectively, what is worse, the thicker must be the layer of the composition, as for almost all coatings need a perfectly smooth surface.

Diagnosing uneven floor

In order to calculate the thickness of the floor screed, it is important to consider the specifics of your base: the height difference and the presence of cavities. It is not enough just to look at and understand a flat floor or not. When considering, it seems smooth, then check the building level or the bar, everything can change. You need to go the device on the floor and you can notice the existence of holes between the building level and base. If small gaps were discovered, the floor will require leveling using screed.

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Mainly the thickness of the screed in a residential room, where you will replace the old cover to the new ranges from 3 to 5 cm, Some mistakenly believe that the thicker the base the better. However, it is not so, we should not forget that the purpose of the screed-leveling, not increasing the height of the flooring.

In addition, if the screed to carry out as normal a fill surface with a thick layer, the surface will not be smooth, dry will be very long, thereby creating a great inconvenience.

Minimum thickness

When calculating the thickness of the screed should take into account several factors:

• On what basis it is formed.
• What mixture she used.

When casting the composition on a concrete slab, the minimum thickness of the floor screed should be 20 mm.

When laying the mortar for heat or sound insulation of loose or solid materials, the layer should not be less than 40 mm and requires a reinforcement mesh of metal. These same rules need to be adhered to when pouring the solution on the layer of waterproofing in the bathroom and in the kitchen.

In accordance with SNIP the thickness of screed to cover piping must be different from the diameter of tubes 10-15 mm in a big way.

Of Course, the thinner the tie layer, the more economical will the repair, but do not forget that “the miser pays twice”, so you should consider several factors:

• Thin layer forms a rapid evaporation of moisture, which can cause cracks in the screed.
• Thin tie layer may not ‘engage” with base;
• Possible violation of the integrity of the screed in the fall of things.

Maximum thickness

Defines the maximum thickness of the screed for each case separately. Basically this figure is indicated on the box or in a memo to the solution. The maximum height for all solutions are different, it ranges from 20 to 80 mm. Experts recommend to use to align the impressive changes in levels of ‘rough screed”, as she copes with this task much better than a dry screed.

If we talk about the maximum thickness, here are their principles, what is the thickness used for the different coatings:

• For display on a flat concrete surface is 20 mm.
• When laying the insulation – 45-50 mm.
• For cold pipeline – 10 mm.
• Hot – 20 mm.

When deploying a large amount you want to keep the cushioning layer 20 mm at the edges, which is required for expansion of material when heating. Seal this layer with construction foam or with a special tape.

Maximum thickness for the dry mixture does not exceed 80 mm. Interpreted that this material is practically evaporates moisture.

The typical composition of cement and sand allowed to be placed in any layer, however professionals do not suggest doing it more than 150 mm, except when there is pouring on the ground.

Classification

Total thickness divided into three types of ties:

• Subtle draft. When you select this view uses self-leveling solutions, allowing to form a thickness up to 20 mm.
• Screed height 70 mm. For its creation is reinforcedof iron mesh or rods of rebar.
• Maximum thickness up to 150 mm. is Formed by calculations of the monolith with an internal steel frame.

The mix

The Minimum thickness of the floor screed as well as the ultimate, depend directly on the composition of the mixture and problems with the base.

The detection thresholds of less than 20 mm and minor irregularities it is recommended to use self-leveling compounds, which give a smooth and thin layer. They are on their own, without the help of a man running across a surface. After drying of the solution can immediately proceed to the computation of the upper cover. The composition of the solution includes:

• Cement or gypsum.
• Fine sand.
• Plasticizers to improve the quality.
• Paste.
• Pigments.

With minor flaws minimum and maximum thickness of the floor screed in the apartment set by the manufacturer of the part.

In Addition to the above, there are still some recommendations by the height of the screed:

• If the screed is formed on top of insulating layer to be left between the wall and her emptiness about 40 mm. Later it will be filled with an insulating filler. Professionals recommend ties of the monolith to isolate from the walls of the waterproof tape.
• For laying on the pavement thickness should be 10 mm.

Cement-sand screed

This structure is used to compensate for irregularities greater than 20 mm. as the sand-cement mixture contains plasticizers, experts say that the thickness of a cement floor screeds should be at least 30 mm. With a smaller thickness over time will crack.

Screed at high differential

There are cases where a monolithic slab is laid very poorly, resulting in large variations in the levels of more than 60 mm. In this case, it is recommended to perform a screed of mortar of a mixture of concrete and coarse sand. Concrete thickness for floor can reach up to 100–150 mm. In the most severe cases, when slope and thresholds reach huge values in the 150-170 mm, be sure to make the lower tie layer of concrete, in the other case the cost and weight of the screed will just be very high.

Dry floor

If there are significant defects to speed up the process quite often used dry screed, which is composed of substances that do not require a long drying. The coupler includes a layer of sediment of raw materials, for example, expanded clay, and over it was covered the sheet material (plywood, particle Board, etc.). If necessary, a hydro, thermal or sound insulation. The thickness of the coating is from 35 to 60 mm.

Radiant floor heating

When the question arises, what is the thickness of the screed water floor should be, then you should first clarify some points. The fact that the device of water warm floor screed performs simultaneously two functions. First and foremost is, of course, the basis for the final coating, the second — accumulation and distribution of heat. In addition, the layer performs a relief function, namely:

• Protects the pipe from damage.
• Top layer of the floor from overheating.
• At the lower layers are formed of sound and heat insulation.

Therefore, to figure out what thickness of screed for Underfloor heating should be required for everyone who is engaged in repair.

Specifically for the implementation of the screed of floor heating are produced inertial solutions, able to conduct and retain heat for a long time. Other solutions are not suitable for this because they “eat” heat. Moreover, in the device warm floor is quite frequent temperature changes that adversely affects the screed of cement and sand.

The Best solution for warm floor currently is a self-leveling floor, for the reason that it is very plastic and dries quickly.

So, what thickness should be screed in the device warm? In this case, the high screed “eat” the heat, besides to set the temperature mode will not be easy. But on the other hand, the coverage will be a long time to warm up, which means more to keep warm.

Too thin screed also not a good option. In this case, it may happen overheating, and the heat will be distributed in places where the pipe laid.

In the flat plate must not be thicker than 100 mm and thinner than 70 mm above the tube layer of a solution – 20–50 mm. In some cases, the design turns out slightly “hanging” in the middle base and the flooring is heat and sound insulation, in this case it is better to create a layer not less than 35 mm.

Another important parameter that determines the thickness of the coupler for warm water floor, – the material of the heating element. Over water floor pipes need to be laid mortar with a thickness of 30 mm.

What can cause incorrect installation of ties?

Failure to comply With the stacking technology reduced operational properties of the screed. It is very important to observe the bias of the coverage level, in case of excess ratio of 0.2%, the topcoat will lay down the rules.

At the base, flattened badly, between the blades of the upper cover can be formed cracks. And about these reviews, when unqualifiedrepairmen just scatter on the floor the cement and pour it on top of the water, even do not want to talk. Reports of such cases you can easily find on specialized forums. Screed laid with violations, quickly begins to crumble, and never will be a solid base for any topcoat.

Such alignment is necessary to break with hammer, carry it away and install again. Working non-professional artists ensures extra expense and loss of time. Much better to do the work on their own in compliance with all of the details and moments, but more importantly, to adhere to the recommended thickness of the screed.

As you can see, to calculate the parameters is a snap. However, depending on the type of screed, it is necessary to take into account all the nuances, which you now know.