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A building panel has a unitary foamed core, and a unitary cover layer of resinous polymeric material covering the core and covering a bottom edge or drip edge and an upper edge of the panel. A system for installation of adjacent panels includes the adjacent panels having vertical clip-receiving groo

A building panel has a unitary foamed core, and a unitary cover layer of resinous polymeric material covering the core and covering a bottom edge or drip edge and an upper edge of the panel. A system for installation of adjacent panels includes the adjacent panels having vertical clip-receiving grooves slidably receiving narrow edges of a clip. The clip holds adjacent panels in coplanar abutting relationship to minimize movement while installed on a wall of a building.

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1. A building panel comprising: a body of a panel extending between a lower bottom edge or drip edge and an upper edge, wherein the upper edge is adapted for fastening to a wall of a building, and the bottom edge or drip edge is adapted to overlap and cover an upper edge of a lower panel of similar

1. A building panel comprising: a body of a panel extending between a lower bottom edge or drip edge and an upper edge, wherein the upper edge is adapted for fastening to a wall of a building, and the bottom edge or drip edge is adapted to overlap and cover an upper edge of a lower panel of similar construction;the body of the panel having a unitary foamed core;a unitary cover layer of resinous polymeric material covering at least exposed visible portions of the core, the bottom edge or drip edge and the upper edge; anda vertical clip receiving groove in said body of the panel, wherein the vertical clip receiving groove has a length which extends for a substantial vertical length of the panel, the vertical clip receiving groove adapted to receive a vertical edge of a corresponding clip for vertical sliding movement in the vertical clip receiving groove, while the clip is adapted to connect to an adjacent panel of similar construction. 2. The building panel of claim 1 wherein the foamed core includes a coloration material that matches a color of an exterior surface or a gray color. 3. A building panel comprising: an upper edge of the panel being horizontal and adapted for fastening to a wall of a building;each of first and second ends of the panel having a vertical clip receiving groove, wherein the vertical clip receiving groove has a length which extends for a substantial vertical length of the panel; anda corresponding clip received in the vertical clip receiving groove in one of the first and second ends, and the clip being vertically slidable in the vertical clip receiving groove, the clip projecting outwardly of the vertical clip receiving groove and spanning across a portion of the panel for slidable receipt in another clip receiving groove of an adjacent panel of similar construction;wherein the panel has a body having a unitary foamed core and a unitary cover layer of resinous polymeric material covering at least exposed visible portions of the unitary foamed core. 4. A building panel comprising: a body of a panel extending between a lower bottom edge or drip edge and an upper edge, wherein the bottom edge or drip edge is adapted to overlap another building panel of similar construction;the upper edge having at least one slot adapted to receive a fastener therein for fastening the panel to a wall of a building;the upper edge being adapted to overlap behind and under a bottom edge or drip edge of another panel of similar construction;a raised flange on the upper edge adapted to impinge against said another panel of similar construction and provide a clearance space receiving the fastener under said another panel of similar construction; anda vertical clip receiving groove, wherein the vertical clip receiving groove has a length which extends for a substantial vertical length of the panel, the vertical clip receiving groove adapted to receive a corresponding clip for vertical slidable movement in the vertical clip receiving groove, while the clip is slidable vertically in another vertical clip receiving groove of an adjacent panel of similar construction;wherein the body has a unitary foamed core and a unitary cover layer of resinous polymeric material covering at least exposed visible portions of the unitary foamed core, the bottom edge or drip edge, and the upper edge. 5. A building panel comprising: a body of a panel extending between a unitary lower bottom edge or drip edge and a unitary upper edge, wherein the upper edge is adapted for fastening to a wall of a building;a bottom edge or drip edge of the panel being adapted to overlap and cover an upper edge of another building panel of similar construction;an inner flange of the panel adapted to stack onto the upper edge of said another building panel of similar construction; anda vertical clip receiving groove, wherein the vertical clip receiving groove has a length which extends for a substantial vertical length of the panel and through the inner flange, the vertical clip receiving groove adapted to receive therein a vertically slidable portion of a corresponding clip for vertical slidable movement in the vertical clip receiving groove, the clip being adapted for connection in another vertical clip receiving groove of an adjacent panel of similar construction;wherein the body has a unitary foamed core and a unitary cover layer of resinous polymeric material covering at least exposed visible portions of the unitary foamed core, the bottom edge or drip edge, and the upper edge. 6. A building panel comprising: a body of a panel extending between a lower bottom edge or drip edge and an upper edge, wherein the upper edge is adapted for fastening to a wall of a building;the upper edge of the panel being adapted to overlap behind a bottom edge or drip edge of another building panel of similar construction;a raised flange of the panel adapted to engage the bottom edge or drip edge of said another building panel of similar construction, and provide a clearance space to receive an enlarged head of a fastener behind the bottom edge or drip edge; anda vertical clip receiving groove, wherein the vertical clip receiving groove has a length which extends for a substantial vertical length of the panel, and a vertically slidable portion of a corresponding clip being vertically slidable therein after being received in the groove, the clip being slidable in another vertical clip receiving groove of an adjacent panel of similar construction;wherein the body has a unitary foamed core and a unitary cover layer of resinous polymeric material covering at least exposed visible portions of the unitary foamed core, the bottom edge or drip edge, and the upper edge. 7. A system for installing building panels, comprising: first and second adjacent panels, wherein each of the first and second adjacent panels has an upper edge adapted for fastening to a wall of a building;each of the first and second adjacent panels being adapted with corresponding first and second end edges for mounting flush against each other;the first of the first and second adjacent panels having a vertical clip receiving groove, wherein the vertical clip receiving groove has a length which extends for a substantial vertical length of the panel, and the second of the first and second adjacent panels having another vertical clip receiving groove;a clip having a vertical edge moveable vertically slidable in the vertical clip receiving groove in the first of the first and second adjacent panels and spanning across portions of the first and second adjacent panels, and the clip having another vertical edge moveable vertically slidable in the another clip receiving groove in the second of the first and second adjacent panels;wherein the panels each have a body having a unitary foamed core and a unitary cover layer of resinous polymeric material covering at least exposed visible portions of the unitary foamed core and the upper edge. 8. The system of claim 7, comprising: the panels having interior portions providing air gaps between the interior portions and a wall to which the building panels are to be fastened to allow air pressure relief and water drainage behind the panels. 9. The system of claim 7, comprising: the adjacent panels engaging the clip with multiple ribs on the first and second adjacent panels. 10. A clip assembled in first and second vertical grooves respectively provided in first and second adjacent building panels, wherein the first and second vertical grooves have first and second lengths which extend for a substantial vertical length of the adjacent building panels which are in abutting and coplanar alignment, wherein the clip is a shaped plate having a unitary first edge projecting outward from a bottom wall of the shaped plate and adapted for vertical slidable movement in the first vertical groove of the first and second vertical grooves, the shaped plate has a unitary second edge projecting outward from the bottom wall and adapted for vertical slidable movement in the second vertical groove of the first and second vertical grooves, and the first edge and the second edge taper from one tall end to another short end, to follow respective cross-section tapers of the adjacent building panels; wherein the panels each have a body having a unitary foamed core and a unitary cover layer of resinous polymeric material covering at least exposed visible portions of the unitary foamed core. 11. The clip of claim 10 wherein an edge of the bottom wall seats against a horizontal flange of the first panel to limit sliding of the shaped plate. 12. The clip of claim 10 wherein the first edge and the second edge are inclined, and the vertical grooves are inclined. 13. The clip of claim 10 wherein the first edge is adapted for slidable receipt along the vertical groove in the first building panel to mount the shaped plate to the first building panel, the second edge is adapted for slidable receipt along the vertical groove in the second building panel to adjust vertical alignment of the second building panel while the first and second edges hold the first and second building panels in abutting relationship, while the shaped plate and the vertical grooves are completely hidden behind the building panels. 14. A building panel comprising: an upper edge of the panel being horizontal and adapted for fastening to a wall of a building;at least two projection ribs at a rear side of the panel;each of first and second ends of the panel having a vertical clip receiving groove, wherein the vertical clip receiving groove extends through the at least two projection ribs; anda corresponding clip received in the vertical clip receiving groove in one of the first and second ends, and the clip being vertically slidable in the vertical clip receiving groove, the clip projecting outwardly of the vertical clip receiving groove and spanning across a portion of the panel for slidable receipt in another clip receiving groove of an adjacent panel of similar construction;wherein the panel has a body having a unitary foamed core and a unitary cover layer of resinous polymeric material covering at least exposed visible portions of the unitary foamed core.