Floor panel with a tongue, groove and a strip

A thin rectangular laminate floor panel with one pair of long edges and one pair of short edges, the floor panel comprising an upper decorative wear layer;

• a core layer arranged beneath the upper decorative wear layer, the core layer being made of a material that is not as hard as the upper decorative wear layer;
• the floor panel having a substantially planar upper top side and a substantially planar lower underside and which is substantially parallel to the upper side, the floor panel further comprising:
• a long-side tongue on the first long edge and a long-side tongue groove on the opposite second long edge, the long-side tongue and long-side tongue groove being formed in the material which is located between said upper top side and said lower underside;
• a short-side tongue on the first short edge and a short-side tongue groove on the opposite second short edge, the short-side tongue and short-side tongue groove being formed in the material which is located between said upper top side and said lower underside;
• a long-side strip integrally formed with the floor panel and extending from a lower part of the long-side tongue groove distally beyond an upper part of the second long edge, the long-side strip extending throughout substantially an entire length of the second long edge and being provided with a long-side locking element projecting from the long-side strip;
• a short-side strip integrally formed with the floor panel and extending from a lower part of the short-side tongue groove distally beyond an upper part of the second short edge, the short-side strip extending throughout substantially an entire length of the second short edge and being provided with a short-side locking element projecting from the short-side strip;
• a long-side locking groove which extends parallel to and spaced from an upper part of the first long edge, the long-side locking groove being formed in the core material and being open at the underside of the floorboard and including an internal long-side locking surface;
• a short-side locking groove which extends parallel to and spaced from an upper part of the first short edge, the short-side locking groove being formed in the core material and being open at the underside of the floorboard and including an internal short-side locking surface;
• the long-side tongue, the long-side tongue groove and the long-side strip are configured such that when the first long edge is pressed against a second long edge of a substantially identical floor panel until upper parts of the long edges are in contact, the long-side tongue on the first long edge enters the long-side tongue groove on the second long edge, and the long-side strip of the substantially identical floor panel extends under the first long edge such that the long edges are locked in a vertical and horizontal direction;
• the short-side tongue, the short-side tongue groove and the short-side strip are configured such that when the first short edge is pressed against a second short edge of another substantially identical floor panel until upper parts of the short edges are in contact, the short-side tongue on the first short edge enters the short-side tongue groove on the second short edge, and the short-side strip of the another substantially identical floor panel extends under the first short edge such that the short edges are locked in a vertical and horizontal direction;
• wherein in the locked position there is space on the long edges between an upper part of the long-side tongue and the upper side of the floor panel and between a tip of the long-side tongue and an inner part of the long-side tongue groove;
• wherein in the locked position there is space on the short edges between an upper part of the short-side tongue and the upper side of the floor panel and between a tip of the short-side tongue and an inner part of the short-side tongue groove;
• wherein the thickness of the floor panel is between 3-10 mm;
• wherein a thickness of the long-side strip varies as the long-side strip extends from the second long edge;
• wherein a thickness of the short-side strip varies as the short-side strip extends from the second short edge.