Floor screed with expanded clay provides high thermal insulation, so it is actively used in the construction of foundations, interfloor floors, floors. Fact – 10 centimeters of expanded clay screed provides greater thermal insulation than 100 centimeters of brick. In addition, this material is reliable, durable, has soundproofing properties. In addition – relatively inexpensive and unusually easy to use, so everyone is wondering how to screed the floor with expanded clay with their own hands. However, not everything is so good. In order to know all the disadvantages, it is much better to see once the consequences of using this material in the bathroom, or in any other room with high humidity. Due to the high hygroscopicity, which is characterized by expanded clay screed, after some time there will be damage to the surface. Therefore, this technology is not applicable everywhere, in some areas it is much better to use a different composition.
Screed with expanded clay can be made of material of different density – from 250 to 600 kg/m3, the technology allows it. Classify several types of expanded clay on the composition:
- Claydite crushed stone – the finest (no more than 15 mm), usually used in the manufacture of concrete.
- Claydite gravel – used to create reliable and non-weighty floors, the size of structural units should not exceed 39 mm.
- Claydite sand – included particles no larger than 5 mm, so it is used to make a floor screed with expanded clay.
Types of screeds, in which the considered building material is used:
- Wet – the most primitive option, suitable only for back rooms, which are rarely visited.
- Dry screed technology involves the use of gypsum fiberboard or moisture-resistant gypsum board.
It is noteworthy that any of these types can be done with the skills to use a screwdriver, level and glue;
The technology of performing screed “with their own hands”
First of all, it is necessary to determine how crooked the floor in the room (will allow to calculate the necessary) height. This can be done using the most ordinary two-meter level, dividing the space into sections and checking each separately. In order to perform a wet screed, you must use expanded clay of a small fraction – poured it and level it at 25 above the beacons and fill with cement, wait 24 hours. After two days, you will need to remove the beacons and pour the mortar where they were. A good way to determine how “mature” the screed is to put it upside down three-liter can. If it fogs up in five minutes, it means that the concrete has not yet dried up. Be that as it may, the final coating of the floor can not be done earlier than fourteen days after the pouring. Dry screed floor with expanded clay is reduced to the fact that in the middle of the beams are poured, then compacted expanded clay, after which the floor boards are made.
Using expanded clay: all the pros and cons
Yes, without a doubt, this technique has a number of its advantages:
- With expanded clay screed significantly increases the speed of leveling the base;
- No dirt and production waste;
- Low price (in the case of water-resistant gypsum plasterboard);
- High strength expanded clay screed.
However, there are also significant disadvantages, which are mainly due to the physical and chemical properties of the material itself (high hygroscopicity):
- Significant loss of strength if you violate the tamping process or use a coarse-grained type of grade.
- Expensive two-layer gypsum fiber boards used in the installation of dry screed;
- The need to perform installation of floor screed with expanded clay only in dry weather.