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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 –

ClassMaximum Permissible Departure from a 2m Straight Edge (mm)Application
SR13mmHigh standard floors, for special use
SR25mmNormal standard floors, for use in commercial and industrial buildings
SR310mmUtility 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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Screed Systems

There are many products on the market and CSC have reached a high industry standard by fully understanding the science behind the installation and associated processes. We have worked very closely with our supply chain to ensure that only the best quality materials are used on all of our sites across the UK.

Live News



Ready for a busy few days on this one. Sand on site ✅ Cement on site ✅ Water facility ✅ Datum level in place ✅ The CSC screed pump and PP Fibres will arrive on site with one of the CSC mobile Screed Team’s. #cscscreeding #constructionuk #screeding ...

Nice to see the CSC Screeding reusable pallet covers out on site and protecting our cement from the elements. #constructionuk #constructionmaterials #cement ...

The CSC Screeding Team are installing Ardex A18 bonding grout and Ardex A29 fast drying screed at the Wembley Point refurbishment project. #constructionuk #cscscreeding #ardexuk #screedingwembley ...

Our MD completed the CITB COVID-19 course today and next week, we’ll be rolling this out to our managers and supervisors. #constructionuk #covid_19 #staysafe ...

CSC blue on a project near you #cscblue #cscblueonaprojectnearyou #cscblueofficial #screedcontractor #constructionuk #mortelmeisteruk ...

A nice example of a pan floated floor screed at one of our new housing projects. Well done team, this is exactly what we represent. Quality and value, quality and value. #cscscreeding #constructionuk #qualityandvalue #screeding #building #floorscreed #craftsman #cscscreedteam ...

Construction Accreditations

CSC Screeding are members of Constructionline, CHAS and Builders Profile where a predefined Health & Safety questionnaire is pre-completed and our clients have direct access to the information. Documents contained in the pre-qualification system are updated throughout the year, ensuring continued compliance. We have focused on developing the business through constant innovation, implementation and collaboration. We are now ready for the business to grow with the increasing demand.