Leveling screed - Noteworthy
If you want to lay a new floor, do not forget to level the screed. Uneven surfaces can cause damage to some floors.
The screed is a layer that is already applied to the existing substrate or to an insulating layer during construction. Among other things, it serves to distribute the pressure evenly and in this way protects the insulating layer. Furthermore, the layer provides a uniform surface, so that the floor covering has a flat bearing surface.
In many cases, the screed also serves to compensate for differences in height, so that no steps are created between rooms with different levels of floor covering. Often, this should be used to achieve a height specified in the blueprint.
Depending on the substrate, different screeds may be required. Cement screed (CT) is actually widely used concrete. If underfloor heating is planned, as a rule, poured asphalt (AS) or calcium sulphate screed (CA) is used. These conduct heat very well and are elastic, so they can expand when heated without cracking.
Unevenness in the surface of the screed will vary depending on the surface. For soft coverings such as carpet or Cushioned Vinyl, the floor clings to the base. Recesses and elevations are clearly visible. This is optically disturbing, but has no effect on the durability.
Hard surfaces such as tiles, parquet or laminate can break the floor. The topsoil bridges depressions without load, but when it is under load, it pushes itself into the groove and breaks.
So that it does not level the screed. Liquid screed automatically levels out due to gravity. For dry line, measure with straight bar and spirit level. If necessary, the landlord must apply putty.
Leveling the subfloor
Leveling the expression means nothing other than bringing it to the same level, so even. As mentioned, screed usually balances automatically when casting. Subsequent leveling is necessary in case of dry stick and if a sticky floor has been detached from the subfloor. This results in holes or residues of adhesive residue.
Instead of trowelling the floor, it is advisable to pour on a self-leveling leveling compound, as it automatically distributes itself evenly. The mass must necessarily fit the existing screed. On cast asphalt or heating screed, only a flexible mass may be applied, with cement all masses are possible. If the subfloor is made of wood, a grid must be additionally applied, since wooden floors work strongly.
In the first step, the maximum height difference is to be determined, ie the difference between the highest and the lowest point. This is the strength of the layer that is to be poured. The manufacturers offer leveling compounds for different layer thicknesses, for example 0 to 5 millimeters or 4 to 20 millimeters. When selecting the right material, the layer thickness as well as the substrate must be taken into account.
Since the mass has about the consistency of canned milk, it is important in the room to make sure that no outflows are present. There may be gaps at the edge between floor and wall or ceiling openings for pipes or pipes. If you do not close it carefully, you will find the mass in the lower room.
The rest is simple: The mass should be mixed with water according to the instructions of the manufacturer. A bucket and a stirrer are beneficial when a larger amount is needed. Casting begins at the furthest point from the door and then slowly heads towards the door.
There is no need to remove it, but the room can not be entered in the next one or two days. Precise time information can be found on the packaging of the product.
If there are no problems in choosing the correct leveling compound, no specialist is required. Landlords who are not sure which screed is available, but should rather be advised by a specialist.
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