Building construction and expansion joint therefor

Claim 1

IN A BUILDING CONSTRUCTION COMPRISING AN EXPANSION JOINT WHICH INCLUDES FIRST AND SECOND GENERALLY PARALLEL ELONGATED INTEGRAL STRIPS OF SHEET MATERIAL LOCATED BETWEEN AND SEPARATING A PAIR OF PLANAR SECTIONS OF PLASTER, COPLANAR SUPPORTING MEMBERS AND MEANS FOR ATTACHING SAID STRIPS TO SAID SUPPORTING MEMEBRS, SAID FIRST STRIP COMPRISING A FIRST PORTION HAVING A FIRST SIDE CLOSER TO THE PLANE OF SAID SUPPORTING MEMBERS AND A SECOND SIDE FURTHER AWAY FROM THE PLANE OF SAID SUPPORTING MEMBERS AND LOCATED SUBSTANTIALLY IN THE PLANE OF THE EXPOSED SURFACES OF SAID SECTIONS OF PLASTER, A SECOND PORTION POSITIONED IN A PLANE WHICH IS GENERALLY PARALLEL TO THE PLANE OF THE SUPPORTING MEMBERS AND HAVING A FIRST SIDE JOINED TO SAID FIRST SIDE OF SAID FIRST PORTION BY A LONGITUDINAL FOLD WHICH EXTENDS THE LENGTH OF THE STRIP, AND A THIRD PORTION POSITIONED GENERALLY PARALLEL TO SAID SECOND PORTION AND TO THE PLANE OF THE SUPPORTING MEMBERS AND HAVING A FIRST SIDE JOINED TO THE SIDE OF SAID SECOND PORTION WHICH IS OPPOSITE TO ITS SAID FIRST SIDE BY A SECOND LONGITUDINAL FOLD EXTENDING ALONG THE LENGTH OF THE STRIP, SAID THIRD PORTION BEING SPACED FROM SAID SECOND PORTION TO FORM A GROOVE EXTENDING BETWEEN THEM FROM SAID SECOND FOLD, SAID SECOND STRIP COMPRISING A FIRST PORTION HAVING A FIRST SIDE CLOSER TO THE PLANE OF SAID SUPPORTING MEMBERS AND A SECOND SIDE FURTHER AWAY FROM THE PLANE OF SAID SUPPORTING MEMBERS AND LOCATED SUBSTANTIALLY IN THE PLANE OF THE EXPOSED SURFACES OF SAID SECTIONS OF PLASTER, SAID SECOND STRIP ALSO COMPRISING A SUBSTANTIALLY FLAT AND SUBSTANTIALLY RIGID CONNECTING MEMBER WHICH IS OF THE THICKNESS OF SAID SHEET MATERIAL, POSITIONED IN A PLANE WHICH IS GENERALLY PARALLEL TO THE PLANE OF SAID SUPPORTING MEMBERS AND HAVING ITS FREE SIDE PORTION TERMINATING IN THE PLANE OF SAID CONNECTING MEMBER, MEANS FOR JOINING THE OTHER SIDE OF SAID CONNECTING MEMBER TO THE FIRST SIDE OF SAID FIRST PORTION OF SAID SECOND STRIP, THE FREE SIDE PORTION OF SAID CONNECTING MEMBER BEING SLIDABLY POSITIONED IN SAID GROOVE, SAID MEANS FOR ATTACHING SAID STRIPS TO SAID SUPPORTING MEMBERS EXTENDING BETWEEN SAID THIRD PORTION OF SAID FIRST STRIP AND A SUPPORTING MEMBER AND BETWEEN SAID CONNECTING MEMBER OF SAID SECOND STRIP AND A SUPPORTING MEMBER TO PROVIDE A SPACE BETWEEN THE ADJACENT SURFACES OF SAID FIRST PORTION OF SAID FIRST STRIP AND FIRST PORTION OF SAID SECOND STRIP WHICH IS SUBSTANTIALLY UNOBSTRUCTED FROM THE CONNECTING MEMBER TO THE ATMOSPHERE, AND THE EDGES OF SAID SECTIONS OF PLASTER ENGAGING THE OPPOSITE SURFACES OF SAID FIRST PORTIONS OF SAID STRIPS.