What proportions of cement mortar for screed and floor filling are required? Review and Step by Step + Video

What proportions of cement mortar for screed and floor filling are required? Review and Step by Step + Video The screed is a solid layer of mortar for leveling the surface. The screed is a protective layer when laying roofing and flooring.

Floor screed is an important step in the interior decoration of a building.

If the proportion of the components of the solution is not observed, the screed is of poor quality, in cracks and irregularities.

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Tie.

A little theory

The role of the screed

Why is it necessary to equip the floor screed?

The screed performs the following functions:

  • What proportions of cement mortar for screed and floor filling are required? Review and Step by Step + Video Levels the rough base;
  • Hides communications that pass on the floor;
  • Protects reinforced concrete slabs from destruction and uneven loading on the surface.

Types

The screed can be ordinary, floating and prefabricated.

Regular screed

Cement-sand screed is the most popular base for floor and roof. With the correct proportion of the components, it will last long and reliably. The prepared mortar is poured onto a reinforced concrete slab and sticks to the base.

There are no layers between them.

What proportions of cement mortar for screed and floor filling are required? Review and Step by Step + Video

Floating screed

Floating screed - the same cement-sand screed, but with a layer of bitumen mastic, mineral wool, roll waterproofing, etc. In this case it does not stick to the base.

What proportions of cement mortar for screed and floor filling are required? Review and Step by Step + Video

Prefabricated screed

To the reinforced concrete base the slats are attached, a dry bedding is poured, leveling the base, it is closed on top with a waterproof plate.

What proportions of cement mortar for screed and floor filling are required? Review and Step by Step + Video

Making the floor screed

We calculate the consumption of materials

It is necessary to observe the ratio of ingredients.

What proportions of cement mortar for screed and floor filling are required? Review and Step by Step + Video The screed ingredients set consists of the following components:

  1. Cement mixture;
  2. sand;
  3. water;
  4. crushed stone, expanded clay, marble chips.

These additional parts are supplemented only in large construction projects. When building a private house, there is no need to add them.

Choosing cement

Cement is divided into the following types:

Portland cement - refers to fast-setting mixtures. It is used for monolithic, concrete and reinforced concrete structures.

What proportions of cement mortar for screed and floor filling are required? Review and Step by Step + Video

Portland slag cement - is obtained by crushing Portland cement and granulated blast furnace slag. It is mainly used in aboveground, underground and underwater structures.

What proportions of cement mortar for screed and floor filling are required? Review and Step by Step + Video

Alumina - the main component of this type of cement is fired crushed alumina ...

It is heat-resistant concrete, i.e. it does not lose its properties when exposed to high temperatures.

What proportions of cement mortar for screed and floor filling are required? Review and Step by Step + Video

Before preparing the screed solution, it is necessary to study which brand of cement is better to use, which keep proportions.

If the mixture for the floor screed is mixed in a concrete mixer, then you must first mix the cement and sand, and only then add water.

For mixing concrete manually, you can use one of two options:

  1. Water is mixed with cement, then sand is added.
  2. Sand and cement are mixed, then water is added. This method helps to get a homogeneous mass.

What proportions of cement mortar for screed and floor filling are required? Review and Step by Step + Video To determine the exact proportions during production, you can use the online calculator for floor screed, in which you will need to enter:

  • the length and width of the room,
  • the screed thickness,
  • and also specify whether the screed reinforcement will be used.

After that, the program will automatically give out the required amount of raw materials.

Tips for Buyers

When purchasing screed ingredients, please note:

  1. What proportions of cement mortar for screed and floor filling are required? Review and Step by Step + Video In order for the screed to be strong, it is necessary to choose the highest grade cement.
    When choosing cement, take not stale packaging, but with a fresh release date. The shelf life and moisture content of the packaging affects the mixture. There is a possibility that the mortar from such cement will not be of high quality.
  2. When building a house, it is advisable to use river sand.


    The gerbils of this sand are fine-grained. There should be no debris in this sand and small stones.

  3. It would seem that the simplest ingredient is water.
    However, there are some nuances here. It is advisable to take water from the water supply system, since it has already passed all the processing, and there are no impurities of dirt and clay in such water.

How to make 1 cubic meter of mortar for screed

In order to determine how many cubic meters you will have it is necessary, it is necessary to multiply the floor area by the height of the planned screed.

For example, let's give the following calculation:

  1. Floor area is 20 m 2
  2. Height screed is 50 mm

Then we get: 20 m 2 * 0.05 m = 1 m 3

What proportions of cement mortar for screed and floor filling are required? Review and Step by Step + Video In the given example, it turned out that we need 1 m3 of mortar to prepare the screed.

Next, we calculate our proportions for the ingredients. Typically, the ratio of cement to sand is reduced to 1: 3.

For example, with the resulting 1 m3 of mortar, the proportions of cement and sand will be as follows:

Cement - 0.25 m 3 ((1/4) * 1 = 0.25)

Sand - 0.75 m 3 ((1/4) * 3 = 0.75)

A mixture of cement and sand is sold in kilograms.

For this it is necessary to convert the resulting cubic meters into kilograms. 1 m3 is 1.3 tons of cement or 330 kilograms.

For example, according to our data it turns out:

Cement = 0.25 m 3 * 330 kg / 1 m 3 = 82.

5 kg.

Sand = 0.75 m3 * 330 kg / 1 m3 = 247.5 kg.

After all the calculations, increase the resulting total by 12 percent, this will go to the shrinkage of the volume.

Working with cement-sand mortar

Filling the screed includes the following steps:

  1. What proportions of cement mortar for screed and floor filling are required? Review and Step by Step + Video Removing debris from the surface.
  2. Treatment of the area with a primer. If the screed is floating, then a waterproofing layer is laid.
  3. Beacons are installed with a step of 60 cm.
  4. Ready solution is poured and aligned with previously installed beacons.

  5. Leaves the surface to dry for a day. Within two weeks, it will fully strengthen and gain strength.
  6. If the screed is not flat enough, pour in another layer.

Dry mix for screed

It is not always possible to correctly determine the proportions of cement-sand mortar. For this, a ready-made dry building mixture was invented.

For work on pouring floors in an apartment, it is the best option. The binders in these mixtures are cement or stucco.

The advantage of dry mixes is as follows:

  • What proportions of cement mortar for screed and floor filling are required? Review and Step by Step + Video not you need to think about the proportions, the manufacturers of ready-made mixtures did it for you;
  • you can dilute the dry mixture in an ordinary deep container by stirring it with a special tool, for example, a construction mixer;
  • by weight, the dry mixture is less than cement and sand, which reduces the load on the floor slabs;
  • also due to the lightest weight it is easier to transport the ready-made dry mix;
  • there are special additives in the ready-made mixtures that add strength to the screed, and also make the surface ideal;
  • the thickness of the screed when using a ready-made dry mortar is several times less than when using a cement-sand mortar;
  • a wide range of mixtures;
  • a universal product, in which, when mixing parts are calculated, thus everyone can dilute and put this mixture;
  • dries faster and gains strength.


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