Method of making an article from a lightweight cementitious composition

A method for making a molded article from a cementitious composition, said method comprising:

• mixing a castable cementitious mixture including an aqueous slurry of at least cement and perlite;
• transferring a quantity of said castable cementitious mixture into an external mold form;
• inserting an internal mold form into said external mold form and said quantity of said castable cementitious mixture, for displacing said quantity of said castable cementitious mixture between said internal mold form and said external mold form such that said castable cementitious mixture flows into a space between side surfaces of said internal mold form and said external mold form to form walls of said molded article;
• maintaining said castable cementitious mixture between said internal mold form and said external mold form until said castable cementitious mixture at least partially cures to form said molded article;
• and
• removing said molded article from said mold.