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How to properly make a floor screed: the stages of work, preparation and pouring mixture

How to make a floor screed correctly? This question worries not only numerous new residents, but also people who have decided to make a major renovation.Floor screed deviceInstallation of floor screed.It is undeniable that only professional craftsmen can make a perfect screed. However, their work costs money, and it is not a fact that the hired team will consist of high-class professionals. Therefore, some people decide to do the screed themselves. There is nothing particularly difficult in this work. It is enough to follow the instructions to arrange a correct, durable and reliable base for laying the floor.

What does the properly made screed mean?

Dry floor screed installation diagram. This means:

  • Correctly assess the condition of the reinforced concrete base or the old floor (sometimes it can not be completely removed).
  • Choose a methodology that in a specific casewill be justified. It's not just about economic benefits: it's quite difficult for a newcomer to make the right cement-concrete mix, and then it's good to align it.
  • Find the right mix composition (this will be discussed below).
  • Wait until the time has come for the screed to dry properly.
  • When laying a floor screed, you need to start by assessing the conditionold floor. First, remove the old floor covering, if there is one. It doesn't matter what it is: modern laminate, old parquet or regular floorboards. All of this needs to be removed.Scheme of laying materials for dry floor screed.Now it is necessary to inspect the old screed. If only small chips or depressions are visible on it, then it can be left, and a new one can be made on top of the old one. If the concrete base is crumbling, swells or has large "holes", then the most reliable solution will be complete removal of the old screed, down to the concrete slab. The exposed concrete slab also requires close attention. When inspecting it, you need to do the following:

  • Using a level or a level find the mosthigh and the lowest points of the floor, determine the height difference. If it exceeds 20 mm, then a self-leveling mixture is more suitable for leveling the floor. It under the action of the law of gravitation forms an even, without changes, layer of height. You can use ordinary cement, but it is important to remember: the thicker the cement layer, the greater the load on the floors. Are you sure that they will withstand a lot of weight?
  • It's time to determine how tight the plates are fitted to each other. If the joints are too wide, uneven or crumbling, they are filled with a mounting foam.
  • The preliminary work is finished, we can move on to the main work: constructing a new screed. Return to the table of contents</a>

    How to properly make a floor screed in a "grandfather's way"?

    Floor scheme with cement-sand screed. "The old-fashioned way" is to use a regular concrete-cement mixture to level the floor. The work is divided into 3 stages:

  • Arrangement of lighthouses.
  • Preparation of the mixture.
  • Directly the construction of the floor screed.
  • Why is it important to follow this particular order?Why can't you first prepare the mixture, then install the beacons, or do without them altogether and just pour the screed right away? The fact is that the concrete mixture dries relatively quickly. And in order to install the beacons necessary for leveling, a certain skill is needed. Therefore, experienced craftsmen recommend this particular work algorithm. To place the beacons, you need to follow several simple rules:

  • Begin the arrangement from the highest point of the floor, remembering that even at this point the layer of the mixture can not be less than 7 mm. The thinner will begin to crumble.
  • The distance between the beacons should not exceed the width of the rule by which the work will be performed.
  • Fasten the beacons better with the aid of alabaster or mortar, from which the masonry will be made.
  • The height of the lighthouses is leveled using self-made linings.
  • Scheme of installation of beacons.When all the marks are in place, the floor is lightly moistened. You can use a roller or a sprayer: whichever is more convenient. Experience shows that the best composition of a traditional concrete mix consists of one part cement and three parts sand. Attention! The sand must be well sifted and cleaned of impurities. For this, use a construction sieve or pieces of fine mesh. It is impossible to make a screed using unprepared sand: the heterogeneity of the fractions will prevent the formation of a smooth surface. Preparing a solution for a floor screed is similar to kneading dough. The more thoroughly the solution is mixed, the stronger the result will be. The process should go according to the following scheme:

  • Prepare a large container of clean water. The water is carefully measured: the strength of the floor screed depends on the proportions.
  • In the water pour the right amount of cement with sand or the finished mixture. This is the most important moment. You can not pour water into the cement.
  • Carefully, to a homogeneous state, mix the contents of the container with a conventional spatula.
  • Change the spatula on the construction mixer (you can use a drill with a nozzle). Stir the solution for at least 7-10 minutes.
  • Rest until the mixture settles, take the mixer again and continue to stir the solution for 3-7 minutes.
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    Why is it better to do a floor screed together?

    Scheme of cement-sand screed on wooden joists. It is better if at least two people participate in the construction of the screed. This is explained by several reasons:

  • You can not prepare a large amount of a solution at once: it will dry, and it is difficult to knead it. Therefore, while one uses the already prepared mixture, the second is working on mixing a new one.
  • The screed process can not be stopped. In one room it needs to be done in one go. Otherwise, the surface will be inhomogeneous. Together it is easier to do (see point 1).
  • Now the mixture is spread out in small portionsconcrete base and level it first with a trowel, then with a rule, using the beacons as a guide. It is better to start work from the far corner, gradually moving towards the exit. It is important to remember:

  • Dependence and speed of work depend on the density and strength of the screed.
  • The work can not be stopped.
  • Beacons can not be removed if they are the same level with the floor. Dismantling them is possible not earlier than two days after pouring.
  • Surface screed necessarily 3-4 times a day you need to wet: so the solution is gaining strength.
  • Walk on the floor can only after two days.
  • It is possible to fully operate the screed not earlier than 20-35 days after filling.
  • If the solution is prepared correctly, the work algorithm is followed precisely, then after 20-35 days:

  • The surface will be a uniform gray color, there will be no dust on it.
  • The level will show that the maximum height difference does not exceed 4 mm.
  • If you hit the screed with a hammer, nothing will happen. If it breaks, then all work will have to be remade.
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    The cost of a self-leveling compound

    Scheme of floor screed with expanded clay.How to make a screed using a self-leveling mixture? The first stages of work, up to the placement of beacons, are no different from pouring ordinary cement. As soon as the base is prepared, it is best to make an estimate. A self-leveling mixture is much more expensive than a regular one, for the following reasons:

  • It already includes all the necessary components.
  • For concrete bases with different height differences and different defects, there are different mixtures and mixes. Their consumption can also be different: it depends on the purpose, the composition.
  • The mixture pours out onto pre-primed floors, and the primer also costs a lot.
  • There are very few people whoarrange a full-fledged thick screed from a self-leveling mixture. Usually they use a trick: pour the "fast" mixture onto a regular screed. Its consumption will decrease several times, and the effect will be very good: the screed will be even, smooth, durable. If it is decided to use a self-leveling mixture, then the slab should be covered with two layers of primer. Usually the packaging indicates which primer is preferable. Naturally, the second layer is applied after the first one has completely dried, and the solution is poured no earlier than a day after the primer has dried. While the primer is drying, you should carefully study the instructions for using the mixture. It will indicate:

  • The amount of material that will be required per 1 m² of surface.
  • The height difference allowed for a particular mixture.
  • The amount of water to be poured into the dry mix.
  • The maximum and minimum thickness of application.
  • Duration of screed drying.
  • It is good if this data is studied before purchase, and just refreshed in memory before pouring. The technology of laying self-leveling mixture is quite simple:

  • The finished composition is poured onto the floor, quicklylevel with a conventional spatula. It is necessary for the composition to spread faster on the floor: in 40-50 minutes it can begin to lose its qualities, freeze. Frozen mixture for work is not suitable. This step can be skipped if the final thickness of the screed is less than 1-3 mm.
  • To ensure that the mixture does not bubble, it is compacted with a special roller (needle).
  • The floors are left for 6-8 hours. After this time, you can walk on the screed. Return to the table of contents</a>

    Self-leveling mixture: bad or good?

    Floor screed scheme for floor tiles. Like any material, this composition has its "pros" and "cons". Pros:

  • An ideally flat surface without depressions is obtained "by itself": the liquid mixture spreads, evenly filling all the irregularities.
  • The speed of work and drying is much faster.
  • Pour the mixture can even without beacons.
  • Water resistance and fire resistance of the finished surface are very high.
  • The weight of the finished screed is several times less than the concrete.
  • Pouring is very simple: even a beginner can cope with work.
  • The longevity of such a screed repeatedly exceeds the service life of cement-concrete.
  • Cons:

  • Self-leveling mixture at a price several times higher than cement.
  • This screed does not have any sound-absorbing properties or heat-saving properties. This means that additional heat and sound insulation will be required.
  • Too large chipped and swings align in the usual way.
  • Now you know how to properly construct a floor screed from different materials. All you have to do is stock up on them and get to work.

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