Windmill Development Case Study

KORE Void Formers and Customised Specification

Elliott Group, a prominent building and civil engineering company, chose KORE Void Formers for the Windmill project to form a concrete slab over podium level. Elliott’s engaged KORE to manufacture the void formers to the exact specifications needed for this complex design.

Elliott Group chose KORE EPS100 White Void Formers, enabling a cast in-situ concrete floor to be formed above the podium concrete slab below. To achieve millimetre accuracy and the required specification of the different floor to soffit heights, KORE manufactured over 150 individual pieces of varying sizes and shapes, allowing the ground floor to be cast to the correct FFL. As another benefit of EPS, the concrete can be poured directly onto the material without the need for a DPM separation layer. The long term physical performance of EPS also makes it a natural choice with defined compressive strength.

EPS is a very well suited product for this application and can be profiled and cut in the factory to match the site specifications. Using EPS void formers solved the issue faced when dealing with infill of existing sites, which can challenge a contractor. As the EPS void formers are lightweight, they are easily placed on site without the need for machinery, creating a temporary formwork to facilitate works. They are less labour and time intensive, avoiding the need for levelling and compacting stone. The voids required precision accuracy down to the millimetre, as the project was very precise with high specifications, including radius layouts and void radius up to 1200mm.

Additional technical information can be found in some of the detailed plans accompanied.