2023 Author: Philip Bishop | [email protected]. Last modified: 2023-08-03 19:28
The screed is used for leveling the floor, strengthening weak concrete bases, repairing minor defects, pouring heated floors. It is also necessary as a base for most floor coverings. The main types of screed are a cement-sand mixture (it can be self-leveling and semi-dry), a self-leveling mixture, a combined and dry do-it-yourself floor screed with video examples - GVL technology.
Before making a floor screed, you should decide what the required operational strength of the screed. For residential premises, it is sufficient if the strength is equivalent to M-150 concrete and, therefore, simple cement-sand mixtures can be used; for commercial or industrial premises, polymer-cement mixtures are required, equal in strength to M-400 concrete.
First you need to find the highest point on the floor. If the height difference is 1-1.5 cm, then it is recommended to use a self-leveling mass, if more - a cement-sand mixture.
It is necessary to apply a special primer mixture to the floor to increase the adhesion of the screed to the concrete. The dilution rate of the primer also depends on the degree of unevenness in the floor. It is believed that if the height difference is up to 2.5 cm, it is necessary to dilute it to the state of "jelly", more than 2.5 cm - to the state of "sour cream".
Do-it-yourself floor screed with self-leveling mixture is the easiest way. It is enough to dilute the mixture according to the instructions and apply it to the floor. Next, you need to pre-level with a large roller. To a horizontal level, the mixture will level itself out due to its high fluidity. The mixture will fully harden after two weeks. The most common method is cement-sand screed.
Currently, a quick and inexpensive method is gaining particular popularity, this is a semi-dry floor screed.
After finding the highest point of the floor, you need to install beacons. It should be noted that the height of the screed must be 3 cm above this point. The beacons are fastened with alabaster, or they can be installed in specially drilled holes in the floor. Now we dilute the mixture and apply it to the floor. When using a bulk mixture, it is enough to apply the required amount on the floor and level it with a rule of 2 meters long, periodically checking with the level. If a semi-dry mixture is taken, then first we apply a base layer, lay a metal mesh on it and apply a second layer of the mixture, which is already leveled with a wide spatula. If necessary, the mixture can be added.
When the screed can withstand the weight of the body, we remove the beacons and cover everything with a film or damp rag for 10 days. This will create optimal conditions for drying and acquiring strength properties. The screed is completely dry after four weeks.
The video below shows the technology of a semi-dry floating screed. We strongly recommend watching.
Useful tips from the authors of the videos listed at the bottom of the video will help you avoid mistakes because knowing how to make the floor screed correctly - do not flood the neighbors from below. Good luck!
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Floor screed is a must, an essential condition for the preparation of flat floors