A cement form includes a unitary body portion having a first surface arranged vertically and configured to support a volume of cement, a second surface arranged horizontally and configured to contact a ground support surface, a foam material, and a detachable portion. The cement form may include a connector groove formed in the weight bearing surface and extending along at least a portion of a length of the body portion. The connector groove is configured to receive a connecting member that extends between adjacent positioned cement forms. The detachable portion may be positioned adjacent to the connector groove.

A cement form made at least in part of a foam material can be used to form a cement foundation of a structure. The cement form can include a cement facing surface oriented vertically and configured to support a volume of cement. The cement can also include a ground facing surface oriented horizontally and configured to contact a ground support surface.

This foundation construction method for a building includes: a first step for creating a foundation base; a second step for installing reinforcement on the foundation base; a third step for installing a frame for creating a foundation to be provided to the foundation base; a fourth step for arranging a plurality of anchors so as to follow the inner periphery of the frame; and a fifth step for placing concrete inside the frame. In the fifth step, the concrete is leveled such that the upper surface of the concrete is the same height as the upper end surface of the frame.

A cement form made at least in part of a foam material can be used to form a cement foundation of a structure. The cement form can include a cement facing surface oriented vertically and configured to support a volume of cement. The cement can also include a ground facing surface oriented horizontally and configured to contact a ground support surface.