Façade system

Abstract

A plank (10) for a façade system comprises a facia (12), a joining lip (20), and a hook (30). The joining lip (20) is recessed behind and extends alongside the facia (12) to overlap with an adjacent plank. The hook 30 extends behind the facia to engage a wall-mounted retainer (38, FIG. 3D). The plank 10 comprises a rail 26 to conceal the hook (30). In one aspect, the rail 26 extends beyond the hook to abut the wall, to restrict a tilt of the plank. In one aspect, the joining lip 20 comprises alignment features (22) for positioning another retainer (40, FIG. 3D). In one aspect, the facia (12) comprises blind grooves (52, FIG. 8B) mimicking inter-plank interstitial grooves. The aspects individually and combined reduce the resources required for covering a large wall area with aligned cladding facias.

1 - 20 . canceled 
     
     
         21 . A plank for an extruded plank façade system comprising a plurality of such planks as cladding suitable for a vertical walling structure, the plank being of the type comprising a facia, a joining lip, and an attachment hook structure,
 wherein the joining lip is recessed behind the facia and extends along a side of the facia to be at least partially overlapped by an adjacent facia of another plank to be provided and to define at least part of a joint groove between the facia and the adjacent facia, 
 wherein the attachment hook structure extends back behind the facia to allow the plank to engage, via the attachment hook structure, a retainer fixed to the walling structure, 
 wherein the plank further comprises a rail to at least partially conceal the attachment hook structure, and 
 wherein the rail extends back from the facia beyond the attachment hook structure, whereby, when the plank is attached to the walling structure by way of the attachment hook structure on the retainer, the rail abuts the walling structure, thereby limiting a tilt of the plank about the attachment hook structure. 
 
     
     
         22 . The plank according to  claim 21 , wherein the attachment hook structure has a contact level with the walling structure where it attaches to the retainer, wherein the rail has a contact level with the walling structure where it contacts the walling structure, and wherein the contact levels of the attachment hook structure and of the rail are spaced apart less than the width of the joining lip. 
     
     
         23 . The plank according to  claim 21 , comprising a lateral screw hole structure behind the facia, the allow another structure to be mounted to the lateral end of the plank, wherein the lateral screw hole structure is spaced from the facia. 
     
     
         24 . The plank according to  claim 23 , wherein the lateral screw hole structure is provided by a double-lip structure. 
     
     
         25 . The plank according to  claim 23 , wherein a lateral screw hole structure is located on the hook structure. 
     
     
         26 . The plank according to  claim 21 , wherein the joining lip comprises a plurality of one of lip protrusions and lip recesses, the lip protrusions and lip recesses, respectively, constituting alignment features for said retainer. 
     
     
         27 . The plank according to  claim 26 , wherein the lip protrusions are provided by ridges, and/or wherein, respectively, the lip recesses are provided by grooves. 
     
     
         28 . The plank according to  claim 26 , wherein the alignment features constituted by said plurality of lip protrusions and lip recesses, respectively, are unequally spaced apart with respect to the distance from the facia. 
     
     
         29 . The plank according to  claim 21 , wherein the attachment hook structure comprises a retainer-engaging face that is inclined relative to the plank plane, such that, the deeper the attachment hook structure is set into the retainer, the closer the plank is held on the walling structure. 
     
     
         30 . The plank according to  claim 21 , wherein the facia comprises an outer flat that, when the plank is mounted to the walling structure, faces away from the walling structure, and wherein the facia comprises on the outer flat one or more facia grooves extending parallel to the joining lip. 
     
     
         31 . The plank according to  claim 30 , wherein the joining lip is recessed behind the flat of the facia by a lip depth, and wherein the at least one facia groove has a facia groove depth practically corresponding to the lip depth. 
     
     
         32 . The plank according to  claim 30 , wherein the at least one facia groove divides the facia into facia strips of practically equal width. 
     
     
         33 . The plank according to  claim 21 , comprised in a plank arrangement for an extruded plank façade system further comprising said retainer, wherein the retainer comprises an attachment mechanism allowing the retainer to be fixed to a walling structure, a retaining lip for engagement with the attachment hook structure, and a spacing element defining a distance between the walling structure and the retaining lip when the plank is installed on the walling structure. 
     
     
         34 . The plank according to  claim 33 , wherein the retainer comprises at least one of a retainer protrusion and a retainer recess for alignment with one of a corresponding lip recess and lip protrusion, respectively, on the joining lip of the plank. 
     
     
         35 . The plank according to  claim 33 , wherein the attachment mechanism comprises a bolt comprising a bolt head arrangement providing the spacing element and the retaining lip. 
     
     
         36 . The plank according to  claim 35 , wherein the bolt head arrangement comprises a flange extending around at least part of the circumference of the bolt head to provide the retaining lip. 
     
     
         37 . The plank according to  claim 35 , wherein the spacing element of the bolt head arrangement is provided by a portion of a shaft of the bolt. 
     
     
         38 . The plank according to  claim 33 , wherein the retainer is dimensioned to be smaller than the space between the attachment hook structure and the rail, thereby avoiding interference of the retainer with the rail's abutment with an underlying walling structure when the attachment hook structure is held on the retaining lip. 
     
     
         39 . The plank according to  claim 33 , wherein the retaining lip comprises an inclined plank-engaging face to engage the attachment hook structure, such that, the deeper the attachment hook structure is set into the tapered plank-engaging face, the closer the plank is held on the walling structure. 
     
     
         40 . A walling structure comprising one or more planks according to  claim 21 .