Nudura’s Insulated Concrete Formwork (ICF) system was selected by Build It magazine for their unique project at Graven Hill, the UK’s largest development to offer self-build opportunities.
Working with an area you would expect on a standard development, architects lapd designed a contemporary three-bedroom house with basement that maximises the potential of the corner plot.
Nudura was chosen for its ability to accelerate the build process, it’s energy efficiency and design flexibility. The fact that Nudura can also be used both below and above ground was another important factor. Basement projects require specialist input and Build It consulted with Nudura distributor, ICF Supplies, who recommended experienced installers ICF Contractors Ltd.
To give greater strength, starter bars were wet set in the basement slab to enable the creation of a solid monolithic concrete wall within the ICF forms. To conform to basement regulations a waterproof concrete was used together with internal tanking and drainage.
With the basement shell in place, the Nudura system continued upwards for the main structural wall, transitioning to a 150mm core block. A beam and block floor were easily accommodated within the Nudura system.
Prior to pouring concrete into the walls it is necessary to erect a specialised alignment system, a 3m high steel channel screwed into position together with an adjustable turnbuckle incorporating a footplate that is also securely fixed into the ground.
The turnbuckle allows minor wall adjustments post pour, while specially designed catwalk brackets affords access for installing the higher courses and pumping the concrete. A complete floor can be poured in one day by implementing a layering system of approximately 1.2m per hour to the top course.
The completed Self Build Education House has become a showcase for the design possibilities and practical choices available to the self-builder.