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Surface Regularity of Screeds and Departure from Datum2019-11-29T16:34:56+00:00

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SURFACE REGULARITY

The class of regularity should be selected from the table below depending on the final use of the floor.  The class is determined by the type of finished flooring to be applied.

Surface Regularity Table –

Class Maximum Permissible Departure from a 2m Straight Edge (mm) Application
SR1 3mm High standard floors, for special use
SR2 5mm Normal standard floors, for use in commercial and industrial buildings
SR3 10mm Utility standard floors, where surface regularity is less critical

As specified by the Construction Industry Research and Association (CIRIA), direct impairment includes immediate problems such as:

  • Trip hazards to pedestrians
  • Excessive sway or wear and tear on wheeled traffic
  • Difficulty in installation of specified equipment on the floor
  • Ponding in wet areas
  • Aesthetic effects at skirting

Assessment of surface regularity of screed using a straightedge –

According to British Standards, Surface Regularity is defined as the deviation in height of the surface of a flooring layer over short distances in a local area. In simpler terms, it is the ‘flatness’ or ‘measure of waviness’ of the screeded surface. To facilitate easy assessment of the flatness of the floor screed, the extent of surface regularity of the screed is generally expressed in terms of permissible departure from the underside of a 2m straightedge on legs laid in contact with the screed.

Indirect impairment includes long term problems such as:

  • Quicker degradation of floor due to increased wear
  • Impact at high spots
  • Lipped Joints

It is therefore important to confine these deviations within reasonable limits so as to ensure adequate serviceability depending on the intended use of the floor.

At CSC, we generally install floor screeds to SR2 specification. We also cater to projects that require SR1. However, it should be noted that SR1 specifications usually dictate a higher cost structure, as is documented in BS8204.

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