Prefabricated heat-insulating panels

Claim 1

A PREFABRICATED HEAT-INSULATING AND SELF-SUPPORTING PANEL OF RIGID UNITARY SANDWICH STRUCTURE COMPRISING A FIRST SHEET OF PLYWOOD, A SLAB OF SYNETHETIC ORGANIC RESIN OF RIGID CELLULAR STRUCTURE INTIMATELY ADHERED TO THE INNER SURFACE OF SAID FIRST PLYWOOD SHEET, A SECOND SHEET OF PLYWOOD INTIMATELY ADHERED TO THE INNER SURFACE OF SAID SLAB, SAID PANEL BEING OF BLOCK-LIKE CONFIGURATION AND HAVING A SUBSTANTIAL LENGTH (X) AND A SUBSTANTIAL WIDTH (Y) AND A THICKNESS (Z); SAID FIRST PLYWOOD SHEET BEING OF COMPOSITE CONSTRUCTION INCLUDING A NUMBER OF INDIVIDUAL SECTIONS CEMENTED TOGETHER IN ABUTTING EDGE RELATIONSHIP TO PROVIDE FIRST JOINTS THEREBETWEEN, EACH OF SAID FIRST PLYWOOD SHEET SECTIONS EXTENDING IN THE Y DIRECTION OF SAID PANEL AND HAVING A LENGTH OF SUBSTANIALLY Y, SAID FIRST JOINTS EXTENDING SUBSTANTIALLY PARALLEL TO EACH OTHER AND IN THE Y DIRECTIONS OF SAID PANEL; SAID SLAB BEING OF COMPOSITE CONSTRUCTION INCLUDING A NUMBER OF INDIVIDUAL BLOCK-LIKE SECTIONS CEMENTED TOGETHER IN ABUTTING EDGE RELATIONSHIP TO PROVIDE SECOND JOINTS THEREBETWEEN, EACH OF SAID SLAB SECTIONS EXTENDING IN THE Y DIRECTION OF SAID PANEL AND HAVING A LENGTH OF SUBSTANTIALLY Y, SAID SECOND JOINTS EXTENDING SUBSTANTIALLY PARALLEL TO EACH OTHER AND IN THE Y DIRECTION OF SAID PANEL; SAID SECOND PLYWOOD SHEET BEING OF COMPOSITE CONSTRUCTION INCLUDING A NUMBER OF INDIVIDUAL SECTIONS CEMENTED TOGETHER IN ABUTTING EDGE RELATIONSHIP TO PROVIDE THIRD JOINTS THEREBETWEEN, EACH OF SAID SECOND PLYWOOD SHEET SECTIONS EXTENDING IN THE Y DIRECTION OF SAID PANEL AND HAVING A LENGTH OF SUBSTANTIALLY Y, SAID THIRD JOINTS EXTENDING SUBSTANTIALLY PARALLEL TO EACH OTHER AND IN THE Y DIRECTION OF SIAD PANEL; SAID FIRST AND SECOND AND THIRD JOINTS BEING MUTUALLY OFFSET WITH RESPECT TO EACH OTHER IN THE Z DIRECTION THROUGH SAID PANEL.