Manufacturer and Distributor of ICF Blocks. Legacy Blocks are Cementitious Insulated Concrete Forms. Because of their unique formula, they require less steel and concrete than other ICF blocks (saving time & money), are Fire Resistant, and when constructed can withstand a Category 5 Hurricane and Tornado winds! Given the thermal mass of Legacy Blocks, they also provide excellent insulative qualities. Structures built with Legacy Block can last several lifetimes, are very easy to construct and allow for unlimited architectural design. Legacy Block is considered a "green" building materials and LEED credits apply!