Mihai Chelmus · Construction Testing, Investigation & Remediation Specialist Email: mihai.chelmus@swantest.co.uk  |  Tel: +44 734 228 1981 Construction structural testing, load verification and on-site assessment for buildings, temporary works and safety-critical elements across London.

Screed testing is commonly required to confirm the in-situ performance of floor screeds prior to trafficking, fit-out or the installation of final finishes. It is routinely specified to verify load-bearing capability, assess readiness for occupation or follow-on trades, and to provide objective evidence of compliance where quality concerns or disputes arise between contractors.

On London projects, screed testing plays a critical role in reducing the risk of premature breakdown, surface crushing or long-term performance issues that can lead to costly remedial works and programme delays.

BRE Drop Hammer Test (BS 8204)

The BRE Drop Hammer Test, carried out in accordance with BS 8204, is used to assess whether a set and hardened screed is sufficiently sound to withstand the anticipated in-service traffic without crushing or disintegration. The test is particularly effective where there are concerns regarding mix proportions, inadequate mixing, poor compaction or inconsistent workmanship.

In accordance with BS 8204, the test is undertaken by subjecting the screed surface to repeated controlled impact blows. An annular weight is dropped vertically down a guided rod onto a hardened steel anvil placed in direct contact with the screed. The depth of indentation resulting from the impacts is measured to determine the soundness of the screed, defined as its ability to carry imposed loads without local failure.

Testing Timing and Measurement

The BRE Screed Tester is designed to allow testing from as early as 14 days after screed installation, depending on screed type and curing conditions. Four successive impact blows are applied to the same test location, after which the depth of indentation is measured using a digital depth gauge.

Guidance is also provided within BS 8204 for the testing of floating screeds, where a reduced annular weight is used to reflect the different load transfer characteristics of the system.

Each test is carried out using a BRE screed tester supplied with a compliance certificate to BS 8204, ensuring consistency and traceability of results.

Typical Test Specification  

• Drop weight (standard screeds): 4kg
• Drop weight (floating screeds): 2kg
• Drop height: 1000mm
• Contact area of anvil: 500mm²
• Measurement method: Digital depth gauge 

By providing quantitative, in-situ performance data, screed testing supports informed decision-making, early identification of deficiencies and confidence in the suitability of the screed for its intended use.

 

If you want the broader view of what we test on London projects — including floor load testing, anchor pull-out and shear testing, lifting beam load testing, façade impact testing, standard barrier testing, sports grounds barrier testing and bespoke structural testing — see our full service overview here:  Structural Testing Services Delivered in London and Across the UK.