Mechanical locking of floor panels with vertical folding

An installation method to connect floor panels with vertical folding whereby the panels have an angling locking system on long edges and a vertical folding system on short edges for locking the panels vertically and horizontally, whereby a first and a second panel are lying flat on a sub floor with a first long of the first panel is connected to a second long edge of second panel, wherein the method comprises the steps of:

• a) bringing a second long edge of a new panel in contact with an upper part of the first long edge of the first panel so that the new panel in one plane is angled at an angle greater than zero relative to the first panel in another plane;
• b) bringing a short edge of the angled new panel in contact with a short edge of the second panel, whereby the angled new panel is maintained at an angle greater than zero relative to the first panel by friction resulting from at least one contact point between the angled new panel and the first panel in the angling locking system on the long edges;
• c) bringing the panels to a position where the long edges have vertical upper and lower contact points and horizontal inner and outer contact points between adjacent surfaces of the first and second long edges while pressing an upper edge of the first panel against an upper edge of the new panel at a contact angle;
• d) pressing a short edge section of the new panel downward towards the sub floor;
• and
• e) connecting the first, second and new panel to each other with vertical folding, wherein the vertical folding system on the short edges comprises an edge with a strip and a locking element which are flexible and comprise wood fibre-based material.