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A new version of the Stepoc dry-build high-strength walling system has been developed by manufacturers Forticrete. Available in full length, half length and plain end/corner units, the Stepoc 325 basement block is 325mm wide, enabling the fast construction of single skin basement retaining walls up to 4 metres high which can carry 2 x leaves plus insulation and cavity. With its extra width and new internal design, the 325 basement block can accommodate reinforcement bars adjacent to either or both faces if required to provide enhanced strength. Once laid to a half running bond, and with reinforcement in place, the blocks are bonded with liquid concrete which is poured down through the interconnected cavities in the blocks. The design of the blocks creates a cascade effect which ensures a smooth filling of the concrete and forces out any air, creating walls which have both compressive and lateral strength. Built dry, with no mortar joint, the blocks require no special onsite skills or techniques as each unit weighs less than 20kgs, well within the HSE guidelines for a single man repetitive lift.

Over 600m2 of Stepoc dry walling has been supplied by Forticrete for a high profile £8 million hotel and residential build next to Euston station. The block was originally specified solely as a retaining wall for the basement level of the development but it proved so quick and easy to lay the project manager took the decision to change the specification mid-build to incorporate Stepoc as a structural wall into a further three storeys of the building.