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.
A little theory
Why is it necessary to equip the floor screed?
The screed performs the following functions:
The screed can be ordinary, floating and prefabricated.
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.
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.
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.
It is necessary to observe the ratio of ingredients.
The screed ingredients set consists of the following components:
These additional parts are supplemented only in large construction projects. When building a private house, there is no need to add them.
Cement is divided into the following types:
Portland cement - refers to fast-setting mixtures. It is used for monolithic, concrete and reinforced concrete structures.
Portland slag cement - is obtained by crushing Portland cement and granulated blast furnace slag. It is mainly used in aboveground, underground and underwater structures.
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.
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:
To determine the exact proportions during production, you can use the online calculator for floor screed, in which you will need to enter:
After that, the program will automatically give out the required amount of raw materials.
When purchasing screed ingredients, please note:
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:
Then we get: 20 m 2 * 0.05 m = 1 m 3
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.
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.
Filling the screed includes the following steps:
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:
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