Interconnectible prefabrication elements

An element for use with others of a like kind in the prefabrication of structures, comprising a hexahedral body of rectangular cross-section, the two faces of one of the two pairs of parallel faces defining said cross-section being of unequal length with that of relatively greater length having therein a longitudinal central parallel-sided groove penetrating the remaining two faces of the body, and two parallel-sided tongues similar in width to said groove and projecting one from each of said remaining two faces centrally relative to the two faces of the other of said two pairs of parallel faces.

A sliding clasp fastener which includes a plurality of elements each comprising a hexahedral body of rectangular cross-section, the two faces of one of the two pairs of parallel faces defining said cross-section being of unequal length with that of relatively greater length having therein a longitudinal central parallel-sided groove penetrating the remaining two faces of the body, and two collinear parallel-sided tongues similar in width to said groove and projecting one from each of said remaining two faces in surface continuity with the smaller of said two faces of unequal length and centrally relative to the two faces of the other of said two pairs of parallel faces a pair of stringer tapes, means attaching to each of said stringer tapes a longitudinal series of said elements similarly oriented and backed on to the tape at the tongue-extended faces thereof, and a sliding clasp for joining together and separating alternate elements on each stringer tape.