How is the smoothness of screed measured?
The smoothness of a screed is typically measured using a straight edge or a laser level, which is placed at various points on the surface to check for any deviations from a perfectly flat and level plane. The measurements are then compared to industry standards, which define different levels of surface regularity (SR) that are required for different types of flooring.
The three main levels of surface regularity are SR1, SR2, and SR3, which are defined as follows:
SR1: This is the highest level of surface regularity and is typically required for high-end floor coverings such as marble, granite, or large format tiles. To achieve an SR1 finish, the maximum deviation from a straight edge over a distance of 2 meters must not exceed 3mm.
SR2: This is a medium level of surface regularity and is typically required for standard floor coverings such as vinyl, linoleum, or carpet tiles. To achieve an SR2 finish, the maximum deviation from a straight edge over a distance of 2 meters must not exceed 5mm.
SR3: This is the lowest level of surface regularity and is typically required for rough floor coverings such as epoxy coatings or industrial flooring. To achieve an SR3 finish, the maximum deviation from a straight edge over a distance of 2 meters must not exceed 10mm.
To ensure that the screed meets the required level of surface regularity, it is important to use high-quality materials and to follow the correct installation procedures. The screed should be mixed to the correct consistency and applied using the appropriate techniques.
Overall, achieving the required level of surface regularity for a given flooring system requires a high level of skill and attention to detail, and should only be attempted by experienced professionals with the necessary expertise and equipment.
