Abstract: Stay in place molds for the construction of concrete structures having fiber cement panels held together by multiple holding units is described. The holding units requires a flat rectangular main body; an indentation substantially located at the center of the upper side of the flat rectangular main body; left and right lateral edges perpendicularly located at the lateral sides of the rectangular body and a lower edge perpendicularly positioned at the lower side of the bottom side of the flat rectangular main body. They are selectively distributed at the internal cavity of the molds as a series of columns and rows separated from each other at predetermined distance. The particular structure and its distribution pattern facilitate the uniform contact of the liquid cement mixture and increase the strength and resistance of the structure prepared using the molds.

Abstract: The instant invention provides stay in place molds for the construction of concrete structures comprising fiber cement panels held together by a series of holding units that are fastened only to the interior surfaces of the cement panels by fastening means that are kept inside of the width of said panels. The holding units are selectively distributed at the internal surfaces of the cement panels in a series of columns separated from each other at predetermined distance. Within each column each holding unit are apart form the next one at a predetermined distance. The particular structure of the holding units, particularly its small size and its distribution pattern at the interior surface of the molds facilitates the uniform contact of the liquid cement mixture and increases the strength and resistance of the structure prepared using the molds.

Abstract: A wall molding system using two (2) prefabricated panels, with finished exterior surfaces placed parallel to each other and held from the inside by separators-anchors. The panels may also use exterior fasteners to hold the weight and pressure of the concrete. Insulating material and structural reinforcements may also be placed inside the mold. Concrete would be used to fill the spaces between the panels.