A set of essentially identical subfloor panels including a joint configured to be glued, wherein the joint includes an element at a strip which protrudes from a first joint edge at an edge of a panel and an element groove at an adjacent edge. The joint includes a flexible tongue which is configured to cooperate, in the joined position, with a tongue groove for positioning of the panel relative the adjacent panel in a first vertical direction. The joint is configured for a joining of the edge and the adjacent edge by a vertical motion of the edge relative the adjacent edge. A space above the strip and between the element and the first joint edge is configured to be filled partly or completely with a glue before the edge and the adjacent edge are joined.

Building panels, such as a floor or wall panels. The panels include a first mechanical locking system include a first locking strip at one of the third edge or fourth edge configured to cooperate for horizontal locking with a first locking groove at the other of the third or fourth edge of an adjacent building panel, preferably by means of a folding motion, and a second locking system including a second locking strip at one of the first edge or second edge, configured to cooperate for horizontal locking with a second locking groove at the other of the first or second edge of an adjacent building panel. The thickness of the second locking strip, in a thickness-direction of the building panel, exceeds the thickness of the first locking strip.

Building panels provided with a locking system for vertical and horizontal locking of a first edge and a second edge of adjacent panels. The locking system includes a displaceable tongue at least partly arranged in a displacement groove, a tongue groove, a cavity provided in a strip at the first edge, and a protrusion extending downwards at the second edge. The displaceable tongue is arranged to be displaced at least partly into the tongue groove during locking, and wherein the protrusion is arranged to be located in least a portion of the cavity when the panels are locked vertically and horizontally.

Ceramic and stone tiles are shown, which are provided with a locking system including a separate strip part connected to vertical and horizontal grooves formed in the tile edge. A set of ceramic or stone tiles including a first tile provided with a first edge and a second tile provided with a second edge wherein the tiles are provided with a locking system for locking the first edge to the second edge in a horizontal direction parallel with a tile surface and in a vertical direction perpendicular to the horizontal direction, said locking system includes a first and a second tongue and a strip part provided with a first and a second locking element.

A set of rectangular building panels have a frontside and a backside and a mechanical locking device at opposite first and second edge portion configured for plane locking of similar panels in an assembled position by means of displacement of a plane with a second edge portion of a second panel in an engagement direction towards a first edge portion of an adjacent first panel. The first edge portion includes a first locking element configured to cooperate for plane locking with a first locking groove at the second edge portion. The first edge portion has a first front edge portion adjacent the frontside of the first panel and a first sub edge portion between the first front edge portion and a flexible tongue in an insertion groove, the insertion groove being arranged between the backside of the first panel and the first sub edge portion.

A set of essentially identical floorboards each including a front face and a rear face extending in the horizontal plane, a core, and a surface layer, a mechanical locking system is arranged at least at two opposite edges for connecting a floorboard with an adjacent floorboard in a horizontal and a vertical direction, said mechanical locking system being configured for connecting the floorboard with the adjacent floorboard by vertical folding, wherein one of said opposite edges is provided with a horizontally extending protrusion at an upper edge, and wherein said protrusion is configured to overlap a surface groove at an upper edge of the other of said opposite edges, such that two connected and adjacent floorboards have upper overlapping edges.

Building panels including a first and a second panel and including a locking device. The locking device includes a tongue and an edge groove provided in the second panel and the first panel, respectively, wherein the tongue and the edge groove are configured to cooperate with each other for locking a first edge portion of the first panel to a second edge portion of the second panel in a first direction. The locking device further includes a separate tongue provided in an insertion groove and a tongue groove configured to cooperate with each other for locking the first edge portion to the second edge portion in a second direction. A length of the tongue groove along an edge portion may be smaller than a length of the edge portion. A length of the insertion groove along an edge portion may be smaller than the length of the edge portion.

A set including a first panel, a second panel and a mechanical locking device for locking the first panel to the second panel, the mechanical locking device includes an insertion groove at the second edge surface, a flexible tongue positioned in the insertion groove and an edge tongue including a tongue groove, the flexible tongue includes a first locking surface and a second locking surface, the first locking surface is configured to cooperate with the tongue groove for locking of the first panel to the second panel in a first direction when the flexible tongue is positioned in the insertion groove in a first orientation, the second locking surface of the flexible tongue is configured to cooperate with the tongue groove for a locking of the first panel to the second panel in a first direction when the flexible tongue is positioned in the insertion groove in a second orientation.

A panel having a core, a top side, a underside, a first edge pair and a second edge pair. The first edge pair has a groove profile at a panel edge and a complementary tongue profile at the opposite panel edge, which cooperate in positively locking relationship so that movement of locked panels away from each other in the plane of the panels is opposed. At its opposite panel edges the second edge pair has a receiving hook and a complementary arresting hook. The arresting hook can be assembled to the receiving hook by a joining movement in a direction perpendicular to the panel plane. The receiving hook has a holding groove for a separate locking element for a vertical locking action. At a corner of the panel the tongue edge of the first edge pair comes together with the receiving hook. The holding groove provided on the receiving hook of the second edge pair for the locking element has an upper groove wall with a spacing from the top side that is greater than the spacing between the panel top side and the tongue top side of the tongue profile of the first edge pair.

A panel including a core, a top side, an underside, a first edge pair and a second edge pair. The first edge pair has a groove profile at a panel edge and a complementary tongue profile at the opposite panel edge, which are lockable by a pivotal movement and positively lock so that movement of locked panels away from each other in the plane of the panels is opposed. At its opposite panel edges the second edge pair has a complementary receiving hook and an arresting hook. The arresting hook is assembled to the receiving hook by a joining movement in a plane perpendicular to the panel plane by the pivotal movement for the first edge pair. The receiving hook or the arresting hook has a holding groove for a separate locking element that provides vertical locking. A butting surface is arranged at the receiving hook substantially orthogonal to the top side. The arresting hook has a counterpart butting surface substantially orthogonal to the top side. The second edge pair has at least one sealing nose at a lower end of the counterpart butting surface of the arresting hook or at a lower end of the butting surface of the receiving hook. The sealing nose extends parallel to the respective panel edge over the entire length of the counterpart butting surface or the butting surface.