As part of Cranleigh School’s ongoing Masterplan development project, two disused squash court buildings were redeveloped and expanded into a new building.
The 2,525m2 Van Hesselt Centre was built using a hybrid steel and wood structure.
The project was co-ordinated using BIM (building information modelling) Revit and IFC files. This improved the co-ordination between the architect, engineer, steel manufacturer, element manufacturer and construction site, minimising mistakes and problems onsite.
Kerto® LVL (laminated veneer lumber) was used in floor and roof elements to stabilise the steel frame. Use of light and green Kerto® LVL products enabled fast installation on the construction site.
The Kerto® LVL elements give stability to the steel frame. As the steelwork had rough tolerances, elements and details were designed to allow for bigger steel tolerances.
To allow varying levels of steel while still retaining the same floor level, a top-hung connection with bearing ribs on the steel was used. The top-hung detail was specially designed for the project, with glued elements and screw reinforcement. Using Kerto® LVL in the roof elements allowed big openings, bringing light to the rooms.
The Kerto® LVL elements were screwed to the pre-drilled steel structure and to each other. Because most of the details were left exposed, it was essential that connectors were partly hidden or completely invisible. This was achieved through careful design, co-operation with the architect and the use of tailored detailing.
All services in the wooden elements were pre-drilled to limit work onsite and minimise damage.