ABSTRACT
Insulated concrete formwork comprises interlocking hollow insulation blocks to make a formwork for in-situ reinforced concrete to be poured in the centre. It is quicker and easier than solid masonry construction and offers a good level of performance and design flexibility. Hollow lightweight blocks are made from different insulation types, commonly expanded polystyrene or wood fibre, which interlock to create a permanent formwork for the concrete. Concrete is poured into the empty blocks every 3 metres high, and can be reinforced for multistorey developments. The concrete is the airtightness barrier so the window frames should be taped to the concrete.
