A decking system comprising floor elements and a connecting system, the connecting system comprising a connecting device for connecting a first floor element and a second floor element, said connecting device being removably connectable to a support member, wherein the connecting device comprises a first and a second connecting portion, wherein an edge portion (110; 210) of the first and second floor elements comprises a first and a second engagement portion, respectively, the first and the second connecting portions being configured to cooperate with the first and the second engagement portions, respectively, for vertically connecting the first and second floor elements, and wherein the connecting device further comprises a displaceable portion which is horizontally displaceable, preferably along a width direction of the connecting device, the connecting device being configured to assume a first and a second horizontal state, a horizontal extension (L2; L2'; L2") of the connecting device in said second horizontal state being smaller than a horizontal extension (L1; L1'; L1") of the connecting device in said first horizontal state, wherein in said first horizontal state: the first and second floor elements are vertically connected, and the first connecting portion and/or the second connecting portion extend(s) essentially in parallel with a top side (101; 201) and/or an underside (102; 202) of the floor elements, and wherein in said second horizontal state: a strength of a vertical connection of a pair of floor elements in the decking system is reduced compared to a strength of the vertical connection of said pair of floor elements in the first horizontal state, characterized in that the connecting device further comprises a locking device for locking the connecting device in said second horizontal state, the locking device comprising a first and a second locking element configured to cooperate with each other. wherein the connecting device comprises a first and a second connecting portion, wherein an edge portion (110; 210) of the first and second floor elements comprises a first and a second engagement portion, respectively, the first and the second connecting portions being configured to cooperate with the first and the second engagement portions, respectively, for vertically connecting the first and second floor elements, and wherein the connecting device further comprises a displaceable portion which is horizontally displaceable, preferably along a width direction of the connecting device, the connecting device being configured to assume a first and a second horizontal state, a horizontal extension (L2; L2'; L2") of the connecting device in said second horizontal state being smaller than a horizontal extension (L1; L1'; L1") of the connecting device in said first horizontal state, wherein in said first horizontal state: the first and second floor elements are vertically connected, and the first connecting portion and/or the second connecting portion extend(s) essentially in parallel with a top side (101; 201) and/or an underside (102; 202) of the floor elements, and wherein in said second horizontal state: a strength of a vertical connection of a pair of floor elements in the decking system is reduced compared to a strength of the vertical connection of said pair of floor elements in the first horizontal state, the first and second floor elements are vertically connected, and the first connecting portion and/or the second connecting portion extend(s) essentially in parallel with a top side (101; 201) and/or an underside (102; 202) of the floor elements, and wherein in said second horizontal state: a strength of a vertical connection of a pair of floor elements in the decking system is reduced compared to a strength of the vertical connection of said pair of floor elements in the first horizontal state,