BRE Drop Hammer Testing

An extra service for the assessment of strength and durability for screed quality and load tolerance.

Overview

The BRE Drop Hammer test is utilized to pinpoint weak spots within a screed, indicating areas potentially unable to withstand anticipated loads or traffic. This test is gaining popularity among screeding contractors as a standard method to verify the quality of screed mixes. It serves as a precautionary measure to uncover any deficiencies in mix proportions, mixing techniques, or screed compaction.

Additionally, the test is employed in assessing screed collapse situations, providing insights into the extent of screed weakness.

How we Test

The BRE Drop Hammer test involves dropping an annular weight (4kg for category A and B, and C screeds – bonded and unbonded, and 2kg for category C – floating screeds under 75mm) from a height of 1 meter down a rod. This weight strikes the collar of an anvil, with the anvil's face in contact with the screed surface. The contact area measures 500 sq.mm. After four consecutive drops in the same location, the depth of the resulting indentation is measured using a depth gauge to the nearest 0.1mm. This measurement determines the screed's ability to withstand traffic.

For areas up to 20 sq.m, a minimum of three tests is recommended. For larger areas, a minimum of three tests per 20-25 sq.m is advised. Test locations should be spaced 3-5 meters apart in corridors. However, positions for testing should be selected randomly, ensuring coverage of vulnerable areas such as bay joints, cracks, and doorways.

When to Test?

It's recommended to conduct a BRE Drop Hammer Test if there are suspicions of issues related to water levels, mixing accuracy, or compaction of the screed. These factors can impact the integrity of the screed. Look out for signs such as crumbling or friability of the screed, poor coloration, or patches of broken-down screed beneath vinyl.

Additionally, the BRE Drop Hammer Test serves as a preventive measure to ensure the strength of the set and hardened screed for its intended purpose.

The test should be conducted when the screed is at least 28 days, in cases a fast drying additive is used we can test as early as 14 days.

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