A contractor broke ground on a new logistics hub near the Slough Trading Estate last winter. The preliminary borelogs suggested medium-dense gravels. But the first few blows of the SPT sampler told a different story. Soft, compressible clay lenses appeared at four metres, exactly where the foundation loads were highest. The design team adjusted the pile lengths within 48 hours. That quick pivot saved the client a six-figure remediation bill and kept the project on schedule. In Slough, the ground conditions shift fast. The Thames gravels overlay the London Clay, but the transition is rarely clean. An SPT test run by a crew that knows the local geology captures those transitions before they become change orders. We deliver the blow counts, the sample recovery, and the contextual interpretation that contractors in Berkshire actually need.
The SPT is not just a blow count. In Slough's gravel-over-clay sequence, it is a window into the load path that will carry your building.
