Understanding the Parameters of Concrete Floor Surface Regularity: Flatness (F) and Levelness (L) according to TR34 and ASTM 1155

Published On: October 03, 2022

Surface regularity, also known as floor flatness and levelness, is an important factor to consider when constructing concrete floors. In order to ensure the efficient movement of goods and machinery on the floor, it is essential that the surface is smooth and even. The TR34 4th Edition is a standard published by the Concrete Society that provides guidelines for the assessment of surface regularity in concrete floors.


The TR34 4th Edition standard specifies tolerances for deviations in the surface of the floor, with the goal of providing a smooth, even surface that is suitable for the intended use of the floor. This standard uses the F-Number system to assess the flatness and levelness of the floor, with higher numbers indicating a smoother, more even surface.


  • To calculate the F-Number for a concrete floor according to the TR34 4th Edition standard, the following steps should be followed:


  • Measure the distance between two points on the floor using a straightedge or a laser level.


  • Calculate the deviation between the measured distance and a reference distance using the formula: Deviation = Measured Distance - Reference Distance


  • Determine the F-Number by dividing the deviation by the reference distance and multiplying by 1000.


The TR34 4th Edition standard also provides guidelines for the measurement of flatness and levelness using digital floor profilers, such as laser floor profilers. These devices use lasers to measure the surface profile of the floor and provide precise and accurate assessments of the surface regularity of the floor.


In addition to specifying tolerances for deviations in the surface of the floor, the TR34 4th Edition standard also provides guidelines for the measurement and evaluation of floor flatness and levelness. This includes recommendations for the use of straightedges, laser levels, and digital floor profilers to assess the surface regularity of the floor.


The importance of surface regularity in concrete floors cannot be overstated. Inefficient movement of goods and machinery on the floor can result in decreased productivity and increased operational costs. By ensuring that the surface of the floor is smooth and even, businesses can maximize the efficiency of their operations and reduce the risk of accidents and injuries.


In summary, the TR34 4th Edition standard is a comprehensive guide for the assessment of surface regularity in concrete floors. This standard specifies tolerances for deviations in the surface of the floor and provides guidelines for the measurement and evaluation of floor flatness and levelness. By following these guidelines, businesses can ensure that their concrete floors are smooth and even, enabling the efficient movement of goods and machinery and reducing operational costs



Surface Regularity