The interlocking building blocks are made with the unique and innovative plastic moulds, which are simply filled with a concrete mix and left to dry. When removed from the mould, a very accurate hollow-core block is created. The unique interlocking shape allows building with great ease and, in conjunction with the glue i.e. thin bed mortar and render (NHBRC-approved building method), a very strong, fast and cheap construction method is created. A 16 x 2m. wall can be built from foundations in 40 minutes, a small house(to roof level) in two days.