Floor: How to balance a slope?

Fewest floors are completely straight and level. Which tolerances you can apply when laying a new floor, how to determine it and how you can compensate for a crooked floor, is explained in this article.

Tolerance values ​​for gradients

Basically one assumes that a gradient on the floor no more than 3 mm difference in height to one meter distance may be. If you measure a longer distance (which is often more reliable to determine the overall gradient, you should not see more than 6 mm of height difference measured over 2 m of measured length.

This is the officially accepted tolerance value for most floor coverings. However, if you want to lay tiles on the floor, you should always keep the tolerances lower.

This is especially true for very large floor tiles or the very trendy XXL tiles in formats of up to 300 x 120 cm. Who laid such tiles, should ideally have a perfectly flat surface.

Determination of slopes

If it is a simple slope, and there are no other bumps, you can easily determine the existing slope by measuring the height difference.

For more problematic surfaces, or if you absolutely want to be sure, you should use for measuring the best Richtscheit and test wedge. The Richtscheit is a very long spirit level, and is used in the same way.

It is created along the edge of the wall and should be in the water - then there is no slope. If this is not the case, push the test wedge at the lower end under the end of the straightedge until it is in the water. On the basis of the scale on the test wedge can then be read very accurately, how large is the height difference between the two ends of the straightedge.

Balance gradient

It is best to balance the slope with leveling compound. These are self-leveling masses that are simply poured into the room and automatically form a perfectly flat surface.

Pay attention to the following points when buying:

  • existing substrate (eg screed, heating screed)
  • maximum measured height differences (here there are different gradations)
  • Required minimum layer thickness of the leveling compound
  • Stability and durability of the compound (may vary, depending on the composition)
  • Necessity of a primer

For the processing of the earth you need at least

  • a smoother and
  • a spiked roller as well
  • a vessel and a whisk for mixing the mass (can be put on the drill)

Tips & Tricks

Leveling with liquid screed is the classic - and very stable - method. The problem here, however, are the long curing times of up to 30 days.

Video Board: How to Level a Concrete Floor - This Old House